Dehumidifier Having Split Condenser Configuration

One aspect provides a dehumidifier that has a dehumidifying circuit and includes an evaporator, a first portion of a condensing circuit, and a first blower configured to direct a first air stream along a first flow path and through the evaporator and the first portion of the condensing circuit, for reducing the humidity of the first air stream. The dehumidifier also comprises a heat removing circuit, comprising a second blower configured to direct a second air stream along a second flow path and through a second portion of the condensing circuit for removing heat from the second portion of the condensing circuit. The first and second condensing circuits are fluidly coupled. 1. A method of manufacturing a dehumidifier , comprising: forming a dehumidifying circuit , comprising placing an evaporator adjacent a first portion of a condensing circuit , and placing a first blower adjacent said evaporator such that said first blower is positioned to direct a first air stream along a first flow path and through said evaporator and said first portion of said condensing circuit , for reducing a humidity of said first air stream; and forming a heat removing circuit , comprising placing a second blower adjacent a second air stream , such that said second blower is positioned to direct a second air stream along a second flow path and through a second portion of said condensing circuit for removing heat from said second portion of said condensing circuit , said first and second condensing circuits being fluidly coupled.2. The method recited in claim 1 , locating said dehumidifying circuit and said heat removing circuit in a common housing having a wall that divides said housing into a dehumidifying region and a heat removing region claim 1 , positioning said first blower in said dehumidifying region and positioning said second blower in said heat removing region.3. The method recited in claim 2 , further comprising positioning a third blower in said dehumidifying region and ...

Systems and methods for refrigerant charge detection

Systems and methods are disclosed for detecting a refrigerant charge in a cooling system. The systems and methods involve performing at least a partial pump down of the refrigerant while monitoring one or more metrics. The measured metrics may be compared to a standard in order to determine if a refrigerant leak has occurred or to determine other refrigerant information. Other systems and methods are disclosed.

Auxiliary heat exchanger having fluid retention member for evaporative cooling

An auxiliary heat exchanger may reduce a temperature of a refrigerant allowed to pass through the auxiliary heat exchanger. The operation of the auxiliary heat exchanger may be controlled. In some implementations, the auxiliary heat exchangers may include fluid retention members, thermoelectric coolers, and/or other types of heat exchangers.

HVAC systems and methods with improved humidity regulation

Systems, devices, and methods are presented for using a liquid desiccant to regulate a moisture content of air conditioned by a heating, ventilating, and air conditioning (HVAC) system. The liquid desiccant is disposed within a processing volume, which is substantially-enclosed and substantially segregates the liquid desiccant from the conditioned air. A pair of vapor-permeable membranes define opposite surfaces of the processing volume. Water vapor diffuses through the vapor-permeable membranes, thereby enabling an exchange of moisture between the liquid desiccant and the conditioned air. The refrigerant circuit itself is used to cool desiccant in the absorber and heat desiccant in the desorber. Other systems, devices, and methods are presented.

Reversible heat pump with cycle enhancements

A cycle enhancement apparatus is provided. The apparatus has a first side entrance line and exit line, both connected to a first side of a refrigerant line, and a second side entrance line and exit line, both connected to a second side of the refrigerant line. One-way valves prevent flow through the first side entrance line toward the first side, through the first side exit line away from the first side, through the second side entrance line toward the second side, and through the second side exit line away from the second side. The apparatus has a cycle enhancement line. The cycle enhancement line has an entrance portion, connected to the first side entrance line and the second side entrance line, an exit portion, connected to the first side exit line and the second side exit line, and a cycle enhancement between the entrance portion and the exit portion.

Dehumidifier having split condenser configuration

One aspect provides a dehumidifier that has a dehumidifying circuit and includes an evaporator, a first portion of a condensing circuit, and a first blower configured to direct a first air stream along a first flow path and through the evaporator and the first portion of the condensing circuit, for reducing the humidity of the first air stream. The dehumidifier also comprises a heat removing circuit, comprising a second blower configured to direct a second air stream along a second flow path and through a second portion of the condensing circuit for removing heat from the second portion of the condensing circuit. The first and second condensing circuits are fluidly coupled.

CARBON DIOXIDE COOLING SYSTEM WITH SUBCOOLING

A system includes a first heat exchanger, a flash tank, a first compressor, a condenser, a second heat exchanger, and a second compressor. The first heat exchanger removes heat from carbon dioxide refrigerant. The flash tank stores the carbon dioxide refrigerant from the first heat exchanger. The first compressor compresses the carbon dioxide refrigerant and sends the compressed carbon dioxide refrigerant to the first heat exchanger. The condenser removes heat from a second refrigerant. The second heat exchanger receives the second refrigerant from the condenser. The second heat exchanger further removes heat from the carbon dioxide refrigerant stored in the flash tank. The second compressor compresses the second refrigerant from the heat exchanger. The second compressor sends the second refrigerant to the condenser. 1. A system comprising:a first heat exchanger configured to remove heat from carbon dioxide refrigerant;a flash tank configured to store the carbon dioxide refrigerant from the first heat exchanger;a first compressor configured to compress the carbon dioxide refrigerant and to send the compressed carbon dioxide refrigerant to the first heat exchanger;a condenser configured to remove heat from a second refrigerant;a second heat exchanger coupled to the flash tank, the second heat exchanger configured to receive the second refrigerant from the condenser, the second heat exchanger further configured to remove heat from the carbon dioxide refrigerant stored in the flash tank; anda second compressor configured to compress the second refrigerant from the second heat exchanger, the second compressor configured to send the second refrigerant to the condenser.2. The system of claim 1 , wherein the second heat exchanger is coupled to an interior surface of the flash tank.3. The system of claim 1 , wherein the second heat exchanger is coupled to an exterior surface of the flash tank.4. The system of claim 1 , wherein the second heat exchanger comprises one or more ...

Active Refrigerant Charge Compensation For Refrigeration And Air Conditioning Systems

A variable refrigerant charge refrigeration/air conditioner system is described that allows the refrigerant charge for the system to be altered based on operating or environmental factors. The system includes a main refrigerant loop holding a volume of refrigerant corresponding to a first level of refrigerant charge, a compressor in the main refrigerant loop, a condenser in the main refrigerant loop, and an evaporator in the main refrigerant loop. A branch refrigerant loop allows the alteration of the refrigerant charge using a control valve in the branch refrigerant loop and a receiver in the branch refrigerant loop. The receiver acts to hold a volume of refrigerant when the control valve is open, thereby removing the volume of refrigerant from the main refrigerant loop. A return path from the receiver to the main refrigerant loop allows refrigerant to flow back into the main loop from the receiver. 1. A method of varying a refrigerant charge in a refrigeration/air conditioning system comprising: monitoring at least one condition associated with the system; determining a desired refrigerant charge for the system based on the at least one condition; determining if a current refrigeration charge for the system is the desired refrigerant charge; and operating a control valve in the system to change the current refrigeration charge to the desired refrigeration charge , the control valve controlling the amount of refrigerant held in a receiver.2. The method of wherein the at least one condition is an operating mode for the system.3. The method of wherein the at least one condition is one or more environmental factors.4. The method of wherein the at least one condition is a combination of operating modes and environmental conditions.5. The method of wherein the refrigerant charge is changeable from a first charge level and a second charge level and back.6. The method of wherein the refrigerant charge is variable between a maximum charge level and a minimum charge level.7 ...

Active refrigerant charge compensation for refrigeration and air conditioning systems

A variable refrigerant charge refrigeration/air conditioner system is described that allows the refrigerant charge for the system to be altered based on operating or environmental factors. The system includes a main refrigerant loop holding a volume of refrigerant corresponding to a first level of refrigerant charge, a compressor in the main refrigerant loop, a condenser in the main refrigerant loop, and an evaporator in the main refrigerant loop. A branch refrigerant loop allows the alteration of the refrigerant charge using a control valve in the branch refrigerant loop and a receiver in the branch refrigerant loop. The receiver acts to hold a volume of refrigerant when the control valve is open, thereby removing the volume of refrigerant from the main refrigerant loop. A return path from the receiver to the main refrigerant loop allows refrigerant to flow back into the main loop from the receiver.

CARBON DIOXIDE COOLING SYSTEM WITH SUBCOOLING

A subcooling controller includes a sensor and a processor. The sensor measures one or more of a temperature external to a first heat exchanger that removes heat from carbon dioxide refrigerant, a temperature of the carbon dioxide refrigerant, and a pressure of the carbon dioxide refrigerant. The processor determines that one or more of the measured temperature external to the first heat exchanger, the temperature of the carbon dioxide refrigerant, and the pressure of the carbon dioxide refrigerant is above a threshold and in response to that determination, activates a subcooling system. The subcooling system includes a condenser, a second heat exchanger, and a compressor. The condenser removes heat from a second refrigerant. The second heat removes heat from the carbon dioxide refrigerant stored in a flash tank. The compressor compresses the second refrigerant from the second heat exchanger and sends the second refrigerant to the condenser. 1. A subcooling controller comprising: a temperature external to a first heat exchanger configured to remove heat from carbon dioxide refrigerant, the first heat exchanger further configured to send the carbon dioxide refrigerant to a flash tank;', 'a temperature of the carbon dioxide refrigerant; and', 'a pressure of the carbon dioxide refrigerant; and, 'a sensor configured to measure one or more of determine that one or more of the measured temperature external to the first heat exchanger, the measured temperature of the carbon dioxide refrigerant, and the measured pressure of the carbon dioxide refrigerant is above a threshold;', a condenser configured to remove heat from a second refrigerant;', 'a second heat exchanger coupled to the flash tank, the second heat exchanger configured to receive the second refrigerant from the condenser, the second heat exchanger further configured to remove heat from the carbon dioxide refrigerant stored in the flash tank; and', 'a compressor configured to compress the second refrigerant from ...

Systems and methods for balancing an HVAC system

Systems and methods are disclosed that involve balancing conditioned air delivered to a plurality of zones based on temperature-time profiles for each of the plurality of zones. Wireless temperature sensors may be used to send temperature data to a processing unit to develop the plurality of temperature-time profiles. The temperature-time profiles are analyzed to identify any outliers requiring adjustment of conditioned air to a zone. Adjustments to balance the conditioned air may be made manually or automatically. Other systems and methods are disclosed.

DISTRIBUTED RENEWABLE ENERGY METERING

A distributed renewable energy system includes a renewable energy generating module having an array of renewable energy generators connected to a population of distributed power inverters. The distributed renewable energy system also includes a distributed energy metering module having a data aggregating unit that receives output energy data from the population of distributed power inverters and a data processing unit that calculates a revenue grade output energy from the output energy data based on a tolerance probability characteristic of the output energy data. The distributed renewable energy system additionally includes a distributed energy reporting module that reports the revenue grade output energy. A method of measuring distributed renewable energy is also provided. 1. A distributed energy metering module , comprising:a data aggregating unit configured to receive output energy data from a population of distributed power inverters connected to an array of renewable energy generators; anda data processing unit configured to calculate a revenue grade output energy for the population of distributed power inverters based on a tolerance probability characteristic of the output energy data.2. The module as recited in wherein each of the population of distributed power inverters is connected to only one renewable energy generator.3. The module as recited in wherein the revenue grade output energy corresponds to a summation of the output energy data from each of the population of distributed power inverters.4. The module as recited in wherein the tolerance probability characteristic of the output energy data corresponds to a summation of the output energy data having a normal distribution around a mean value.5. The module as recited in wherein the tolerance probability characteristic of an accuracy of the output energy data corresponds to applying the Central Limit Theorem to predict a mean and standard deviation of the accuracy of the output energy data from 30 or ...

DEHUMIDIFER HAVING SPLIT CONDENSER CONFIGURATION

One aspect provides a dehumidifier that has a dehumidifying circuit and includes an evaporator, a first portion of a condensing circuit, and a first blower configured to direct a first air stream along a first flow path and through the evaporator and the first portion of the condensing circuit, for reducing the humidity of the first air stream. The dehumidifier also comprises a heat removing circuit, comprising a second blower configured to direct a second air stream along a second flow path and through a second portion of the condensing circuit for removing heat from the second portion of the condensing circuit. The first and second condensing circuits are fluidly coupled. 1. A dehumidifier , comprising:a dehumidifying circuit, comprising an evaporator, a first portion of a condensing circuit, and a first blower configured to direct a first air stream along a first flow path and through said evaporator and said first portion of said condensing circuit, for reducing a humidity of said first air stream; anda heat removing circuit, comprising a second blower configured to direct a second air stream along a second flow path and through a second portion of said condensing circuit for removing heat from said second portion of said condensing circuit, said first and second condensing circuits being fluidly coupled.2. The dehumidifier recited in claim 1 , wherein said dehumidifying circuit and said heat removing circuit are located within a common housing and said housing has a wall that divides said housing into a dehumidifying region and a heat removing region claim 1 , said first blower being located in said dehumidifying region and said second blower being located in said heat removing region.3. The dehumidifier recited in claim 2 , further comprising a third blower located in said dehumidifying region and fluidly coupled to an indoor space by a supply air duct.4. The dehumidifier recited in claim 2 , wherein said dehumidifying region is fluidly coupled to an indoor ...

CARBON DIOXIDE COOLING SYSTEM WITH SUBCOOLING

A subcooling controller includes a sensor and a processor. The sensor measures one or more of a temperature external to a first heat exchanger that removes heat from carbon dioxide refrigerant, a temperature of the carbon dioxide refrigerant, and a pressure of the carbon dioxide refrigerant. The processor determines that one or more of the measured temperature external to the first heat exchanger, the temperature of the carbon dioxide refrigerant, and the pressure of the carbon dioxide refrigerant is above a threshold and in response to that determination, activates a subcooling system. The subcooling system includes a condenser, a second heat exchanger, and a compressor. The condenser removes heat from a second refrigerant. The second heat removes heat from the carbon dioxide refrigerant stored in a flash tank. The compressor compresses the second refrigerant from the second heat exchanger and sends the second refrigerant to the condenser. 1. A subcooling controller comprising: a temperature external to a first heat exchanger configured to remove heat from carbon dioxide refrigerant, the first heat exchanger further configured to send the carbon dioxide refrigerant to a flash tank;', 'a temperature of the carbon dioxide refrigerant; and', 'a pressure of the carbon dioxide refrigerant; and, 'a sensor configured to measure one or more of determine that one or more of the measured temperature external to the first heat exchanger, the measured temperature of the carbon dioxide refrigerant, and the measured pressure of the carbon dioxide refrigerant is above a threshold;', a condenser configured to remove heat from a second refrigerant;', 'a second heat exchanger coupled to an exterior surface of the flash tank, the second heat exchanger configured to receive the second refrigerant from the condenser, the second heat exchanger further configured to remove heat from the carbon dioxide refrigerant stored in the flash tank; and', 'a compressor configured to compress the ...

PREMISES POWER SOURCE ACCESSORY PANEL FOR AN OUTDOOR UNIT AND METHOD OF ADAPTING AN OUTDOOR UNIT WITH THE SAME

An outdoor unit of an HVAC system comprises a frame, at least one refrigerant coil mounted to the frame, a fan motor, a compressor, a controller, and a premises power source accessory panel. The fan motor is coupled to a fan which drives air through the refrigerant coil. The compressor is coupled to the refrigerant coil to drive refrigerant therethrough. The controller is coupled to the fan motor and compressor. The premises power source accessory panel is removably coupled to the frame and includes a bracket and circuit protection element. The bracket has at least one electrical conduit aperture. The circuit protection element is mounted to the bracket and coupleable to a premises power source. The premises power source is a renewable-energy power source located on a premises of the HVAC system. The bracket is removably coupleable to the outdoor unit in lieu of a conventional electrical conduit panel. 1. An outdoor unit of an HVAC system , comprising:a frame;at least one refrigerant coil mounted to said frame;a fan motor coupled to a fan and configured to drive air through said at least one refrigerant coil;a compressor coupled to said at least one refrigerant coil to drive refrigerant therethrough;a controller coupled to said fan motor and said compressor; and a bracket having at least one electrical conduit aperture, and', 'a circuit protection element mounted to said bracket and coupleable to a premises power source, wherein said premises power source is a renewable-energy power source located on a premises of said HVAC system, said bracket removably coupleable to said outdoor unit in lieu of a conventional electrical conduit panel., 'a premises power source accessory panel removably coupled to said frame and including2. The outdoor unit as recited in wherein said outdoor unit is a condensing unit of said HVAC system and said compressor is a refrigerant compressor.3. The outdoor unit as recited in wherein said outdoor unit is part of a heat pump system and said ...

Reversible Heat Pump with Cycle Enhancements

A cycle enhancement apparatus is provided. The apparatus has a first side entrance line and exit line, both connected to a first side of a refrigerant line, and a second side entrance line and exit line, both connected to a second side of the refrigerant line. One-way valves prevent flow through the first side entrance line toward the first side, through the first side exit line away from the first side, through the second side entrance line toward the second side, and through the second side exit line away from the second side. The apparatus has a cycle enhancement line. The cycle enhancement line has an entrance portion, connected to the first side entrance line and the second side entrance line, an exit portion, connected to the first side exit line and the second side exit line, and a cycle enhancement between the entrance portion and the exit portion.

ICING PROTECTION FOR A HEAT PUMP

A protective housing is provided for a heating, ventilation, and air conditioning (HVAC) unit having a fan therein. The fan comprises a plurality of blades, each blade having a proximal and distal end. The housing comprises a plurality of side panels, each side panel comprising openings enabling airflow into the housing. The housing further comprises an access panel that is coupled between two of the plurality of side panels wherein the access panel and the plurality of side panels form an enclosure. An orifice ring is mounted within the housing, wherein a running clearance between the distal end of the fan blades and the orifice ring has a first spacing. A cover fastens atop the enclosure, the cover comprising a grill having a plurality of grill members, wherein the grill members are separated by a second spacing, the second spacing being smaller than the first spacing. 1. (canceled)2. A protective housing for a heating , ventilation , and air conditioning (HVAC) unit having a fan therein , the housing comprising:a plurality of side panels, each side panel comprising openings enabling airflow into the housing;an access panel, the access panel being coupled between two of the plurality of side panels, wherein the access panel and the plurality of side panels form an enclosure;an orifice ring mounted within the housing;a cover fastened atop the enclosure; anda relief air vent, the relief air vent extending over the orifice ring, through an opening formed in the access panel, and extending beneath the cover.3. The housing according to claim 2 , wherein the fan comprises a plurality of fan blades claim 2 , wherein each blade of the plurality of fan blades comprises a proximal end and a distal end.4. The housing according to claim 3 , wherein a running clearance between the distal ends of the plurality of fan blades and the orifice ring has a first spacing.5. The housing according to claim 4 , wherein the cover comprises a grill having a plurality of grill members claim ...

Auxiliary Heat Exchangers

An auxiliary heat exchanger may reduce a temperature of a refrigerant allowed to pass through the auxiliary heat exchanger. The operation of the auxiliary heat exchanger may be controlled. In some implementations, the auxiliary heat exchangers may include fluid retention members, thermoelectric coolers, and/or other types of heat exchangers. 1. A system comprising: a first surface comprising one or more fluid retention members coupled to at least a portion of the first surface of the auxiliary heat exchanger;', 'a second surface opposed to the first surface; and', 'a refrigerant conduit coupled to at least a portion of the second surface;', 'wherein a temperature of at least a part of refrigerant in the refrigerant conduit is reduced by heat transfer from the part of the refrigerant to at least one of the fluid retention members., 'an auxiliary heat exchanger comprising2. The system of wherein the auxiliary heat exchanger further comprises a condensate line coupled to at least one of the fluid retention members.3. The system of wherein the auxiliary heat exchanger further comprises a container coupled to at least one of an evaporator or a water line claim 1 , and wherein a fluid leaving the container flows to at least one of the fluid retention members.4. The system of wherein the container automatically allows water to flow from the water line into the container when a fluid level in the container is less than a predetermined fluid level.5. The system of further comprising an air conditioner claim 1 , wherein the air conditioner comprises a switch claim 1 , and wherein the switch controls the operation of the auxiliary heat exchanger.6. The system of wherein at least one of the fluid retention members comprises channels configured to retain fluid at least partially in the channels claim 1 , and wherein air flows proximate the channels claim 1 , and wherein the air at least partially evaporates the fluid at least partially retained in the channels to reduce a ...

Ice Sensor for a Heat Pump

In various implementations, an ice sensor may include heater(s), ice accumulation surface(s), and/or temperature sensor(s). During operation, heat from a heater may be provided to an ice accumulation surface and a temperature sensor(s) may determine temperature(s) of the ice accumulation surface. A determination of whether ice is present on the ice sensor may be based at least partially on the determined temperature(s).

METHOD AND SYSTEM FOR PROTECTING A SINGLE-STAGE FURNACE IN A MULTI-ZONE SYSTEM

A method of protecting a single-stage furnace in a multi-zone system includes monitoring a temperature of each zone of a plurality of zones, determining if the temperature of at least one zone of the plurality of zones is less than a threshold temperature, powering on the HVAC system to satisfy a heating demand of the zone having a temperature less than the threshold temperature, monitoring an outlet temperature of the single-stage furnace, determining if the outlet temperature is greater than an outlet temperature threshold, and responsive to a determination that the outlet temperature is greater than the outlet temperature threshold, modulating a gas valve to reduce a flow of gas to the single-stage furnace. 1. A method of protecting a single-stage furnace in a multi-zone system , the method comprising:monitoring, by an HVAC controller of an HVAC system, a temperature of each zone of a plurality of zones;determining, by the HVAC controller, if the temperature of at least one zone of the plurality of zones is less than a threshold temperature;responsive to a determination that the temperature of at least one zone of the plurality of zones is less than the threshold temperature, powering on the HVAC system to satisfy a heating demand of the zone having a temperature less than the threshold temperature;monitoring, by the HVAC controller, an outlet temperature of the single-stage furnace;determining, by the HVAC controller, if the outlet temperature is greater than an outlet temperature threshold; andresponsive to a determination that the outlet temperature is greater than the outlet temperature threshold, modulating a gas valve to reduce a flow of gas to the single-stage furnace.2. The method of claim 1 , comprising:determining, by the HVAC controller, if the heating demand has been satisfied; andresponsive to a determination that the heating demand has not been satisfied, returning to the monitoring step.3. The method of claim 1 , wherein the powering on the HVAC ...

OPTIMIZED LOW POWER AIR CIRCULATION IN HVAC SYSTEMS

A system comprising a furnace, an impeller, and a controller. The impeller directs air into an environment through the furnace. The controller receives calls to heat the environment or circulate air in the environment. In response to receiving a call to heat the environment, the controller activates the furnace and the impeller such that the impeller draws a first amount of power and turns in a first direction causing air to be impelled from the impeller through the furnace into the environment. In response to receiving a call to circulate air in the environment, the controller activates the impeller such that the impeller draws a second amount of power and turns in a second direction causing air to be impelled from the impeller into the environment, wherein the second amount of power is less than the first amount of power and the second direction is opposite the first direction. 1. A system comprising:a furnace;a blower comprising an impeller operable to direct air into an environment through the furnace; and in response to receiving a first call to heat the environment, activate the furnace and the impeller such that the blower draws a first amount of power and the impeller turns in a first direction causing air to be impelled from the impeller and traverse the furnace into the environment; and', 'in response to receiving a second call to circulate air in the environment, activate the impeller such that the blower draws a second amount of power and the impeller turns in a second direction causing air to be impelled from the impeller and into the environment, wherein the second amount of power is less than the first amount of power and the second direction is opposite the first direction., 'a controller operable to2. The system of claim 1 , further comprising a sensor operable to measure a temperature of the environment wherein the controller is operable to deactivate the furnace when the temperature of the environment rises above a threshold temperature.3. The ...

Ice Sensor For a Heat Pump

In various implementations, an ice sensor may include heater(s), ice accumulation surface(s), and/or temperature sensor(s). During operation, heat from a heater may be provided to an ice accumulation surface and a temperature sensor(s) may determine temperature(s) of the ice accumulation surface. A determination of whether ice is present on the ice sensor may be based at least partially on the determined temperature(s).

METHOD AND APPARATUS FOR REDUCTION OF WATER RE-EVAPORATION IN A DEDICATED DEHUMIDIFIER/WATER HEATER

An apparatus that includes a refrigeration circuit that includes an evaporator, a first condenser and a compressor. The apparatus includes a refrigerant-water heat exchanger that includes a second condenser fluidly coupled to the refrigeration circuit. A control valve is operatively connected to the refrigeration circuit to direct flow of refrigerant through at least one of the first condenser during a dehumidification mode and the second condenser during a water heating mode. A damper is disposed on an upwind side of the evaporator, the damper being operable to reduce airflow across the evaporator during a ventilation mode. 1. An apparatus comprising:a refrigeration circuit comprising an evaporator, a first condenser and a compressor;a refrigerant-water heat exchanger comprising a second condenser fluidly coupled to the refrigeration circuit; anda control valve operatively connected to the refrigeration circuit to direct flow of refrigerant through at least one of the first condenser during a dehumidification mode and the second condenser during a water heating mode; anda damper disposed on an upwind side of the evaporator, the damper being operable to reduce airflow across the evaporator during a ventilation mode.2. The apparatus of claim 1 , wherein the damper restricts a size of a flow path across the evaporator.3. The apparatus of claim 1 , wherein the damper directs air to a bypass flow path around the evaporator.4. The apparatus of claim 1 , wherein the damper reduces re-evaporation of water into air moving through the evaporator.5. The apparatus of claim 1 , wherein the damper is a louvered damper.6. The apparatus as recited in claim 1 , wherein the damper comprises a plurality of flaps.7. The apparatus of claim 1 , wherein the damper reduces airflow across the evaporator from a first range of approximately 200 CFM to approximately 250 CFM to a second range of approximately 40 CFM to approximately 50 CFM.8. The apparatus of claim 1 , wherein the damper ...

System and method for sealing and supporting external pipe connections in fluid lines and directing escaped fluids to a cabinet in an hvac system

A stub pipe housing and a method for installing a stub pipe housing in a heating, ventilation, and air conditioning (“HVAC”) system, the stub pipe housing comprising a first end for sealed contact with an external surface of a cabinet in the HVAC system and a non-permeable material extending to a second end for sealed contact with an external pipe. Sealed contact between the first end and the cabinet, sealed contact between the second end and the external surface, and the non-permeable material ensures any fluid escaping the connection between the stub pipe and the external pipe is directed to the cabinet. The stub pipe housing supports the connection using resilient material, rigid material with compliant seals or some combination. Fluids are directed to flow through the stub pipe opening in the cabinet or directed to flow through other openings.

Hvac systems and methods with improved humidity regulation

Systems, devices, and methods are presented for using a liquid desiccant to regulate a moisture content of air conditioned by a heating, ventilating, and air conditioning (HVAC) system. The liquid desiccant is disposed within a processing volume, which is substantially-enclosed and substantially segregates the liquid desiccant from the conditioned air. A pair of vapor-permeable membranes define opposite surfaces of the processing volume. Water vapor diffuses through the vapor-permeable membranes, thereby enabling an exchange of moisture between the liquid desiccant and the conditioned air. The refrigerant circuit itself is used to cool desiccant in the absorber and heat desiccant in the desorber. Other systems, devices, and methods are presented.

Multi-stage system for cooling a refrigerant

According to certain embodiments, a refrigeration system comprises first and second evaporators, first and second compressors, and a gas cooler. The first and second evaporators receive liquid refrigerant from a flash tank and evaporate the refrigerant to cool a first case and a second case, respectively. The second case has a higher temperature set point than the first case. The first compressor compresses the refrigerant discharged from the first evaporator. The second compressor compresses the refrigerant discharged from the first compressor, flash gas from the flash tank, and the refrigerant discharged from the second evaporator. The gas cooler comprises an air-cooled stage that cools the refrigerant discharged from the second compressor and an evaporative stage that cools the refrigerant discharged from the air-cooled stage. The gas cooler further comprises an outlet that supplies the cooled refrigerant to the flash tank through an expansion valve.

METHOD AND APPARATUS FOR REFRIGERANT DETECTOR CALIBRATION CONFIRMATION

A refrigerant detector testing system according to aspects of the disclosure includes a metering orifice formed in a suction line that is disposed between an evaporator coil and a compressor, a valve fluidly coupled to the metering orifice, a connecting tube fluidly coupled to the valve on a side opposite the metering orifice, a mixing device having an input orifice fluidly coupled to the connecting tube. In some embodiments, the mixing device includes an air intake disposed proximate the input orifice, a throttling portion downstream of the input orifice and the air intake, the throttling portion having a reduced cross-sectional area, and a diffuser section positioned downstream of the throttling portion, the diffuser section having an output orifice. According to aspects of the disclosure, a refrigerant detector fluidly exposed to the output orifice. 1. A refrigerant detector testing system comprising:a metering orifice formed in a suction line that is disposed between an evaporator coil and a compressor;a valve fluidly coupled to the metering orifice;a connecting tube fluidly coupled to the valve on a side opposite the metering orifice; an air intake disposed proximate the input orifice;', 'a throttling portion downstream of the input orifice and the air intake, the throttling portion having a reduced cross-sectional area; and', 'a diffuser section positioned downstream of the throttling portion, the diffuser section having an output orifice; and, 'a mixing device having an input orifice fluidly coupled to the connecting tube, the mixing device comprisinga refrigerant detector fluidly exposed to the output orifice.2. The refrigerant detector testing system of claim 1 , wherein the valve is a solenoid valve.3. The refrigerant detector testing system of claim 1 , wherein the valve is electrically connected to an HVAC controller.4. The refrigerant detector testing system of claim 1 , wherein the refrigerant detector is positioned proximate a circulation fan.5. The ...

Fan Systems

A fan system may generate an air flow during use. In various implementations, a fan system may include a fan and an orifice. The orifice may include a converging section, a diverging section, and a minimum radius section disposed between the converging section and the diverging section.

SYSTEMS AND METHODS FOR REFRIGERANT CHARGE DETECTION

Systems and methods are disclosed for detecting a refrigerant charge in a cooling system. The systems and methods involve performing at least a partial pump down of the refrigerant while monitoring one or more metrics. The measured metrics may be compared to a standard in order to determine if a refrigerant leak has occurred or to determine other refrigerant information. Other systems and methods are disclosed. 1. A method of determining refrigerant information in a cooling system , wherein the cooling system comprises:a closed circuitous conduit containing a refrigerant therein,an evaporator fluidly coupled to the circuitous conduit,a condenser fluidly coupled to the circuitous conduit,a compressor fluidly coupled to the circuitous conduit, andone or more transducers for measuring one or more metrics of the cooling system;the method comprising:temporarily stopping the flow of refrigerant in a portion of the circuitous conduit;continuing to run the compressor;monitoring the one or more transducers to develop cooling-system data; anddeveloping the refrigerant information from the cooling-system data.2. The method of claim 1 , wherein the one or more transducers comprises one or more liquid level sensors associated with the condenser claim 1 , and the cooling-system data comprises level information of the refrigerant in the condenser.3. The method of claim 2 , further comprising:measuring a first elapsed time period to achieve a predetermined level of refrigerant in the condenser;subsequently measuring a second elapsed time period to achieve the predetermined level of refrigerant in the condenser; andcomparing the first time period and second time period.4. The method of claim 1 , wherein the one or more transducers comprises a low-pressure-side pressure transducer claim 1 , and the cooling-system data comprises a pressure at the low-pressure-side pressure transducer.5. The method of claim 1 , wherein the one or more transducers comprises a low-pressure-side pressure ...

Systems and methods for balancing an hvac system

Systems and methods are disclosed that involve balancing conditioned air delivered to a plurality of zones based on temperature-time profiles for each of the plurality of zones. Wireless temperature sensors may be used to send temperature data to a processing unit to develop the plurality of temperature-time profiles. The temperature-time profiles are analyzed to identify any outliers requiring adjustment of conditioned air to a zone. Adjustments to balance the conditioned air may be made manually or automatically. Other systems and methods are disclosed.

Fan systems

A fan system may generate an air flow during use. In various implementations, a fan system may include a fan and an orifice. The orifice may include a converging section, a diverging section, and a minimum radius section disposed between the converging section and the diverging section.

LIQUID TRANSFER PUMP CYCLE

A method of initiating a low-energy cooling mode using a controller of an HVAC system includes measuring a temperature of ambient air proximal to a condenser coil and determining whether the temperature of the ambient air proximal the condenser coil is less than a temperature threshold. If the temperature of the ambient air is less than the temperature threshold, the HVAC system is configured to operate in a low-energy cooling mode. In the low-energy cooling mode, the controller opens a first bypass valve to allow a refrigerant to bypass a compressor and the compressor is powered off. The HVAC system is operated until a cooling demand has been met. 1. An HVAC system configured to provide low-energy cooling , the HVAC system comprising:an evaporator coil comprising an evaporator coil inlet and an evaporator coil outlet;a condenser coil comprising a condenser coil inlet and a condenser coil outlet, the condenser coil outlet being coupled to the evaporator coil inlet;a first bypass valve comprising a first bypass valve inlet coupled to the evaporator coil outlet and a first bypass valve outlet coupled to the condenser coil inlet;a liquid pump comprising a liquid pump inlet coupled to the condenser coil outlet and a liquid pump outlet coupled to the evaporator coil inlet; anda thermal expansion valve coupled between the liquid pump and the evaporator coil inlet; and measure a temperature of ambient air proximal to the condenser coil;', 'determine whether the temperature of the ambient air proximal to the condenser coil is less than a temperature threshold;', 'responsive to a determination that the temperature of the ambient air is less than the temperature threshold, configure the HVAC system to operate in a low-energy cooling mode by opening the first bypass valve to allow a refrigerant to bypass a compressor and powering off the compressor; and', 'operate the HVAC system in the low-energy cooling mode., 'an HVAC controller configured to2. The HVAC system of claim 1 , ...

HVAC Signaling System and Method

A system incudes an equipment interface module (EIM) and a control unit. The EIM includes a signal encoder that is operable to generate one or more encoded signals by encoding one or more instructions onto one or more electrical signals according to one or more received commands from a thermostat unit. The signal encoder is further operable to transmit the generated one or more encoded signals on one or more of a plurality of electrical wires. The control unit is coupled to the EIM via the plurality of electrical wires and includes a signal decoder. The signal decoder is operable to decode the one or more instructions from the one or more encoded signals on the one or more electrical wires. The control unit is operable to control one or more functions of a motor according to the decoded instructions from the signal decoder.

Reversible heat pump with cycle enchancements

A cycle enhancement apparatus is provided. The apparatus has a first side entrance line and exit line, both connected to a first side of a refrigerant line, and a second side entrance line and exit line, both connected to a second side of the refrigerant line. One-way valves prevent flow through the first side entrance line toward the first side, through the first side exit line away from the first side, through the second side entrance line toward the second side, and through the second side exit line away from the second side. The apparatus has a cycle enhancement line. The cycle enhancement line has an entrance portion, connected to the first side entrance line and the second side entrance line, an exit portion, connected to the first side exit line and the second side exit line, and a cycle enhancement between the entrance portion and the exit portion.

ICING PROTECTION FOR A HEAT PUMP

A protective housing is provided for a heating, ventilation, and air conditioning (HVAC) unit having a fan therein. The fan comprises a plurality of blades, each blade having a proximal and distal end. The housing comprises a plurality of side panels, each side panel comprising openings enabling airflow into the housing. The housing further comprises an access panel that is coupled between two of the plurality of side panels wherein the access panel and the plurality of side panels form an enclosure. An orifice ring is mounted within the housing, wherein a running clearance between the distal end of the fan blades and the orifice ring has a first spacing. A cover fastens atop the enclosure, the cover comprising a grill having a plurality of grill members, wherein the grill members are separated by a second spacing, the second spacing being smaller than the first spacing. 1. A protective housing for a heating , ventilation , and air conditioning (HVAC) unit having a fan therein , said fan comprising a plurality of fan blades each blade having a proximal and distal end , the housing comprising:a plurality of side panels, each side panel comprising openings enabling airflow into the housing;an access panel, said access panel coupled between two of the plurality of side panels, wherein said access panel and said plurality of side panels form an enclosure;an orifice ring mounted within said housing, wherein a running clearance between said distal ends of said fan blades and said orifice ring has a first spacing; anda cover fastened atop the enclosure, said cover comprising a grill having a plurality of grill members, wherein said grill members are separated by a second spacing, which is smaller than the first spacing.2. The housing according to claim 1 , further comprising a relief air vent claim 1 , said relief air vent extending over said orifice ring claim 1 , through an opening formed in the side access panel claim 1 , and extending beneath said cover.3. The housing ...

LIQUID TRANSFER PUMP CYCLE

A method of initiating a low-energy cooling mode using a controller of an HVAC system includes measuring a temperature of ambient air proximal to a condenser coil and determining whether the temperature of the ambient air proximal the condenser coil is less than a temperature threshold. If the temperature of the ambient air is less than the temperature threshold, the HVAC system is configured to operate in a low-energy cooling mode. In the low-energy cooling mode, the controller opens a first bypass valve to allow a refrigerant to bypass a compressor and the compressor is powered off. The HVAC system is operated until a cooling demand has been met. 120-. (canceled)21. An HVAC system configured to provide low-energy cooling , the HVAC system comprising:an evaporator coil comprising an evaporator coil inlet and an evaporator coil outlet; a primary cooling path coupled to a first collector;', 'a secondary cooling path coupled to a secondary cooling path inlet; and', 'a first cooling-path outlet coupled to the secondary cooling path inlet via a first collection tube to direct a refrigerant to the secondary cooling path from the first collector of the primary cooling path, wherein the first collection tube bypasses a second primary cooling path inlet and a second primary cooling path outlet;, 'a condenser coil comprising a condenser coil inlet and a condenser coil outlet, the condenser coil outlet being coupled to the evaporator coil inlet, the condenser coil comprisinga first bypass valve comprising a first bypass valve inlet coupled to the evaporator coil outlet and a first bypass valve outlet coupled to the condenser coil inlet;a second bypass valve disposed in parallel with the thermal expansion valve between the liquid pump and the evaporator coil inlet; and measure a temperature of ambient air proximal to the condenser coil;', 'determine whether the temperature of the ambient air proximal to the condenser coil is less than a temperature threshold specified by the ...

Method and apparatus for reduction of water re-evaporation in a dedicated dehumidifier/water heater

An apparatus that includes a refrigeration circuit that includes an evaporator, a first condenser and a compressor. The apparatus includes a refrigerant-water heat exchanger that includes a second condenser fluidly coupled to the refrigeration circuit. A control valve is operatively connected to the refrigeration circuit to direct flow of refrigerant through at least one of the first condenser during a dehumidification mode and the second condenser during a water heating mode. A damper is disposed on an upwind side of the evaporator, the damper being operable to reduce airflow across the evaporator during a ventilation mode.

Heat exchanger construction

A heat exchanger includes a plurality of conduits that extend between a first endplate and a second endplate. A first manifold is coupled to the first endplate to couple the first manifold to first ends of the plurality of conduits. An inlet is coupled to the first manifold to direct a first fluid into the first manifold and at least one baffle is disposed within the first manifold to form a first cavity and a second cavity. The at least one baffle of the first manifold is configured to direct the first fluid from the inlet to a first conduit of the plurality of conduits. A second manifold is coupled to the second endplate to couple the second manifold to second ends of the plurality of conduits and at least one baffle is disposed within the second manifold to form a fourth cavity and a fifth cavity.

Active Refrigerant Charge Compensation for Refrigeration and Air Conditioning Systems

A variable refrigerant charge refrigeration/air conditioner system is described that allows the refrigerant charge for the system to be altered based on operating or environmental factors. The system includes a main refrigerant loop holding a volume of refrigerant corresponding to a first level of refrigerant charge, a compressor in the main refrigerant loop, a condenser in the main refrigerant loop, and an evaporator in the main refrigerant loop. A branch refrigerant loop allows the alteration of the refrigerant charge using a control valve in the branch refrigerant loop and a receiver in the branch refrigerant loop. The receiver acts to hold a volume of refrigerant when the control valve is open, thereby removing the volume of refrigerant from the main refrigerant loop. A return path from the receiver to the main refrigerant loop allows refrigerant to flow back into the main loop from the receiver. 1. A variable refrigerant charge refrigeration/air conditioner system comprising:a main refrigerant loop holding a volume of refrigerant corresponding to a first level of refrigerant charge;a compressor in the main refrigerant loop;a condenser in the main refrigerant loop, the condenser operable to remove heat from the refrigerant;an evaporator in the main refrigerant loop, the evaporator receiving refrigerant from the condenser and operable to cause the refrigerant to absorb heat;a branch refrigerant loop in fluid communication with the main refrigerant loop;a control valve in the branch refrigerant loop;a receiver in the branch refrigerant loop, the receiver operable to hold a volume of refrigerant drawn from the main refrigerant loop when the control valve is open; anda return path from the receiver to the main refrigerant loop;wherein the first level of refrigerant charge is reduced to a second level of refrigerant charge by storing the volume of refrigerant in the receiver when the control valve is open.2. The system of wherein the return path from the receiver to ...

METHOD AND APPARATUS FOR REFRIGERANT DETECTOR CALIBRATION CONFIRMATION

A refrigerant detector testing system according to aspects of the disclosure includes a metering orifice formed in a suction line that is disposed between an evaporator coil and a compressor, a valve fluidly coupled to the metering orifice, a connecting tube fluidly coupled to the valve on a side opposite the metering orifice, a mixing device having an input orifice fluidly coupled to the connecting tube. In some embodiments, the mixing device includes an air intake disposed proximate the input orifice, a throttling portion downstream of the input orifice and the air intake, the throttling portion having a reduced cross-sectional area, and a diffuser section positioned downstream of the throttling portion, the diffuser section having an output orifice. According to aspects of the disclosure, a refrigerant detector fluidly exposed to the output orifice. 1. An HVAC system , comprising:an evaporator coil;a circulation fan disposed to direct air through the evaporator coil;a compressor fluidly coupled to the evaporator coil via a suction line;an HVAC controller;a metering orifice formed in the suction line;a valve fluidly coupled to the metering orifice and electrically connected to the HVAC controller;a mixing device fluidly coupled to the valve, the mixing device having an air intake and an output orifice; anda refrigerant detector fluidly exposed to the output orifice.2. The HVAC system of claim 1 , wherein the valve is a solenoid valve.3. The HVAC system of claim 1 , wherein the valve is electrically connected to the HVAC controller.4. The HVAC system of claim 1 , wherein the refrigerant detector is positioned proximate the circulation fan.5. The HVAC system of claim 1 , wherein the metering orifice is at least one of an orifice plate and a venturi device.6. The HVAC system of claim 1 , wherein the mixing device comprises an input orifice fluidly coupled to a connecting tube.7. The HVAC system of claim 6 , wherein the mixing device comprises:a throttling portion ...

Auxiliary heat exchangers

An auxiliary heat exchanger may reduce a temperature of a refrigerant allowed to pass through the auxiliary heat exchanger. The operation of the auxiliary heat exchanger may be controlled. In some implementations, the auxiliary heat exchangers may include fluid retention members, thermoelectric coolers, and/or other types of heat exchangers.

Icing protection for a heat pump

A protective housing is provided for a heating, ventilation, and air conditioning (HVAC) unit having a fan therein. The fan comprises a plurality of blades, each blade having a proximal and distal end. The housing comprises a plurality of side panels, each side panel comprising openings enabling airflow into the housing. The housing further comprises an access panel that is coupled between two of the plurality of side panels wherein the access panel and the plurality of side panels form an enclosure. An orifice ring is mounted within the housing, wherein a running clearance between the distal end of the fan blades and the orifice ring has a first spacing. A cover fastens atop the enclosure, the cover comprising a grill having a plurality of grill members, wherein the grill members are separated by a second spacing, the second spacing being smaller than the first spacing.

Carbon dioxide cooling system with subcooling

A subcooling controller includes a sensor and a processor. The sensor measures one or more of a temperature external to a first heat exchanger that removes heat from carbon dioxide refrigerant, a temperature of the carbon dioxide refrigerant, and a pressure of the carbon dioxide refrigerant. The processor determines that one or more of the measured temperature external to the first heat exchanger, the temperature of the carbon dioxide refrigerant, and the pressure of the carbon dioxide refrigerant is above a threshold and in response to that determination, activates a subcooling system. The subcooling system includes a condenser, a second heat exchanger, and a compressor. The condenser removes heat from a second refrigerant. The second heat removes heat from the carbon dioxide refrigerant stored in a flash tank. The compressor compresses the second refrigerant from the second heat exchanger and sends the second refrigerant to the condenser.

Heat pump control system using passive defrost

A heat pump system includes a controller and a closed system that includes a condensing heat exchanger coil, an evaporating heat exchanger coil, a refrigerant and a compressor. The compressor is configured to compress the refrigerant, thereby causing the refrigerant to have a greater pressure in the condensing heat exchanger coil than in the evaporating heat exchanger coil. The controller is configured to perform a passive defrost of the evaporating heat exchanger coil. The passive defrost includes disabling the compressor and providing a bypass path between the condensing and evaporating heat exchanger coils that bypasses the compressor. The bypass path allows the refrigerant to flow from the condensing heat exchanger coil to the evaporating heat exchanger coil while the compressor is disabled.

Auxiliary heat exchangers

An auxiliary heat exchanger may reduce a temperature of a refrigerant allowed to pass through the auxiliary heat exchanger. The operation of the auxiliary heat exchanger may be controlled. In some implementations, the auxiliary heat exchangers may include fluid retention members, thermoelectric coolers, and/or other types of heat exchangers.

Water distribution tray

A water distribution tray having an improvement comprising a first downwardly inclined surface therein commencing at a base of a water impingement pedestal within a first of a plurality of channels and ending at a corresponding first of a plurality of discharge apertures, wherein the first downwardly inclined surface has a first declension angle associated therewith, and a second downwardly inclined surface commencing at the base within a second of the plurality of channels and ending at a corresponding second of the plurality of discharge apertures, wherein the second downwardly inclined surface has a second declension angle associated therewith different from the first declension angle. A method of manufacturing is also provided.

Ice sensor for a heat pump

In various implementations, an ice sensor may include heater(s), ice accumulation surface(s), and/or temperature sensor(s). During operation, heat from a heater may be provided to an ice accumulation surface and a temperature sensor(s) may determine temperature(s) of the ice accumulation surface. A determination of whether ice is present on the ice sensor may be based at least partially on the determined temperature(s).

Heat pump control system using passive defrost

A heat pump system includes a controller and a closed system that includes a condensing heat exchanger coil, an evaporating heat exchanger coil, a refrigerant and a compressor. The compressor is configured to compress the refrigerant, thereby causing the refrigerant to have a greater pressure in the condensing heat exchanger coil than in the evaporating heat exchanger coil. The controller is configured to perform a passive defrost of the evaporating heat exchanger coil. The passive defrost includes disabling the compressor and providing a bypass path between the condensing and evaporating heat exchanger coils that bypasses the compressor. The bypass path allows the refrigerant to flow from the condensing heat exchanger coil to the evaporating heat exchanger coil while the compressor is disabled.

Systems and methods for refrigerant charge detection

Systems and methods are disclosed for detecting a refrigerant charge in a cooling system. The systems and methods involve performing at least a partial pump down of the refrigerant while monitoring one or more metrics. The measured metrics may be compared to a standard in order to determine if a refrigerant leak has occurred or to determine other refrigerant information. Other systems and methods are disclosed.

Dehumidifier having split condenser configuration

One aspect provides a dehumidifier that has a dehumidifying circuit and includes an evaporator, a first portion of a condensing circuit, and a first blower configured to direct a first air stream along a first flow path and through the evaporator and the first portion of the condensing circuit, for reducing the humidity of the first air stream. The dehumidifier also comprises a heat removing circuit, comprising a second blower configured to direct a second air stream along a second flow path and through a second portion of the condensing circuit for removing heat from the second portion of the condensing circuit. The first and second condensing circuits are fluidly coupled.

Ice sensor for a heat pump

In various implementations, an ice sensor may include heater(s), ice accumulation surface(s), and/or temperature sensor(s). During operation, heat from a heater may be provided to an ice accumulation surface and a temperature sensor(s) may determine temperature(s) of the ice accumulation surface. A determination of whether ice is present on the ice sensor may be based at least partially on the determined temperature(s).

Auxiliary heat exchangers

An auxiliary heat exchanger may reduce a temperature of a refrigerant allowed to pass through the auxiliary heat exchanger. The operation of the auxiliary heat exchanger may be controlled. In some implementations, the auxiliary heat exchangers may include fluid retention members, thermoelectric coolers, and/or other types of heat exchangers.

Air conditioning system with variable condenser reheat for enhanced dehumidification

A vapor compression air conditioning system, including a heat pump embodiment, provides enhanced dehumidification of supply air to an enclosed space. The refrigerant fluid circuit includes an evaporator and a reheat heat exchanger for controlling temperature and dehumidification of supply air. A variable speed fan motor controls air flow over an outdoor condenser heat exchanger whereby condenser heat exchange may be shifted progressively between the reheat heat exchanger and the condenser heat exchanger. One alternate embodiment includes a thermosiphon system for heat transfer to and from the reheat heat exchanger. Another embodiment includes a bypass air flow control damper for controlling flow of supply air through the evaporator and the reheat heat exchanger.

Multi-stage system for cooling a refrigerant

According to certain embodiments, a refrigeration system comprises first and second evaporators, first and second compressors, and a gas cooler. The first and second evaporators receive liquid refrigerant from a flash tank and evaporate the refrigerant to cool a first case and a second case, respectively. The second case has a higher temperature set point than the first case. The first compressor compresses the refrigerant discharged from the first evaporator. The second compressor compresses the refrigerant discharged from the first compressor, flash gas from the flash tank, and the refrigerant discharged from the second evaporator. The gas cooler comprises an air-cooled stage that cools the refrigerant discharged from the second compressor and an evaporative stage that cools the refrigerant discharged from the air-cooled stage. The gas cooler further comprises an outlet that supplies the cooled refrigerant to the flash tank through an expansion valve.

Systems and methods for refrigerant charge detection

Systems and methods are disclosed for detecting a refrigerant charge in a cooling system. The systems and methods involve performing at least a partial pump down of the refrigerant while monitoring one or more metrics. The measured metrics may be compared to a standard in order to determine if a refrigerant leak has occurred or to determine other refrigerant information. Other systems and methods are disclosed.

Liquid transfer pump cycle

A method of initiating a low-energy cooling mode using a controller of an HVAC system includes measuring a temperature of ambient air proximal to a condenser coil and determining whether the temperature of the ambient air proximal the condenser coil is less than a temperature threshold. If the temperature of the ambient air is less than the temperature threshold, the HVAC system is configured to operate in a low-energy cooling mode. In the low-energy cooling mode, the controller opens a first bypass valve to allow a refrigerant to bypass a compressor and the compressor is powered off. The HVAC system is operated until a cooling demand has been met.

Combined multi-modal air conditioning apparatus and negative energy storage system

ABSTRACT OF THE DISCLOSURE The present combined multi-modal apparatus involves: (a) apparatus for cooling, by means of a refrigerant circulating within coils disposed in a tank a negative heat energy storage material during a first time period; (b) associated apparatus for utilizing that stored negative heat energy during a second time period; and (e) most particularly, a tank by-pass structure for directly connecting a condensing unit and an evaporating unit during a third time period, such as for example when supplemental cooling is required. Specifically, the tank by-pass structure avoids circulation during the third time period of the refrigerant within the conduits or coils disposed within the negative heat energy storage material contained within the tank. Thus, during this third time period, heat is not imparted to the negative heat energy storage material by the circulating refrigerant, the cooled or frozen negative heat energy storage material is not heated or melted by circulating refrigerant, and thus does not have to be recooled or refrozen subsequently for re-storage of energy therewithin for later use in cooling during peak hours (i.e., during the second time period). During a fourth time period, the cooling Or both of second and third time periods is carried out simultaneously. Yet further, a heat pump may be operatively connected hereto for providing heat during a heating time period.

Premises power source accessory panel for an outdoor unit and method of adapting an outdoor unit with the same

A premises power source accessory panel for an outdoor unit, a method of adapting an outdoor unit with a premises power source accessory panel and an outdoor unit incorporating the panel or the method. In one embodiment, the panel includes: (1) a bracket having at least one electrical conduit aperture and (2) a circuit protection element mounted to the bracket and configured to be coupled to a premises power source, the bracket removably couplable to the outdoor unit in lieu of a conventional electrical conduit panel.

Systems and methods for balancing an hvac system

This application is directed to providing improvements in the field of heating, ventilating and cooling systems. There is often a technical problem in structures having multiple zones that cause variable temperature profiles. The present disclosure provides a method of balancing a volume of conditioned air delivered to multiple zones by deploying a temperature sensor in each zone. Conditioned air is then introduced to each zone. Temperature measures for each zone using the temperature sensors are recorded to develop a temperature-time profile for each zone. Identify temperature-time profiles varying from other temperature-time profiles by more than a preselected amount and tune air flow in response. Temperature measures are recorded over several time periods to develop an average temperature profile for each zone from the multiple temperature-time profiles. Identify average temperature-time profiles varying from other average temperature-time profiles by more than a designated margin and tune air flow in response.

Icing protection for a heat pump

A protective housing is provided for a heating, ventilation, and air conditioning (HVAC) unit having a fan therein. The fan comprises a plurality of blades, each blade having a proximal and distal end. The housing comprises a plurality of side panels, each side panel comprising openings enabling airflow into the housing. The housing further comprises an access panel that is coupled between two of the plurality of side panels wherein the access panel and the plurality of side panels form an enclosure. An orifice ring is mounted within the housing, wherein a running clearance between the distal end of the fan blades and the orifice ring has a first spacing. A cover fastens atop the enclosure, the cover comprising a grill having a plurality of grill members, wherein the grill members are separated by a second spacing, the second spacing being smaller than the first spacing.

Reversible heat pump with cycle enhancements

A cycle enhancement apparatus is provided. The apparatus has a first side entrance line and exit line, both connected to a first side of a refrigerant line, and a second side entrance line and exit line, both connected to a second side of the refrigerant line. One- way valves prevent flow through the first side entrance line toward the first side, through the first side exit line away from the first side, through the second side entrance line toward the second side, and through the second side exit line away from the second side. The apparatus has a cycle enhancement line. The cycle enhancement line has an entrance portion, connected to the first side entrance line and the second side entrance line, an exit portion, connected to the first side exit line and the second side exit line, and a cycle enhancement between the entrance portion and the exit portion.

Utility-interactive system architecture

Hvac signaling system and method

A system incudes an equipment interface module (EIM) and a control unit. The EIM includes a signal encoder that is operable to generate one or more encoded signals by encoding one or more instructions onto one or more electrical signals according to one or more received commands from a thermostat unit. The signal encoder is further operable to transmit the generated one or more encoded signals on one or more of a plurality of electrical wires. The control unit is coupled to the EIM via the plurality of electrical wires and includes a signal decoder. The signal decoder is operable to decode the one or more instructions from the one or more encoded signals on the one or more electrical wires. The control unit is operable to control one or more functions of a motor according to the decoded instructions from the signal decoder.

Liquid transfer pump cycle

A method of initiating a low-energy cooling mode using a controller of an HVAC system includes measuring a temperature of ambient air proximal to a condenser coil and determining whether the temperature of the ambient air proximal the condenser coil is less than a temperature threshold. If the temperature of the ambient air is less than the temperature threshold, the HVAC system is configured to operate in a low-energy cooling mode. In the low-energy cooling mode, the controller opens a first bypass valve to allow a refrigerant to bypass a compressor and the compressor is powered off. The HVAC system is operated until a cooling demand has been met.

Multi-stage system for cooling a refrigerant

According to certain embodiments, a refrigeration system comprises first and second evaporators, first and second compressors, and a gas cooler. The first and second evaporators receive liquid refrigerant from a flash tank and evaporate the refrigerant to cool a first case and a second case, respectively. The second case has a higher temperature set point than the first case. The first compressor compresses the refrigerant discharged from the first evaporator. The second compressor compresses the refrigerant discharged from the first compressor, flash gas from the flash tank, and the refrigerant discharged from the second evaporator. The gas cooler comprises an air-cooled stage that cools the refrigerant discharged from the second compressor and an evaporative stage that cools the refrigerant discharged from the air- cooled stage. The gas cooler further comprises an outlet that supplies the cooled refrigerant to the flash tank through an expansion valve.

Utility-interactive inverter system architecture and method of operation thereof

arquitetura de sistema de inversor interativo com empresa de serviço público e seu método de operação

ARQUITETURA DE SISTEMA DE INVERSOR INTERATIVO COM EMPRESA DE SERVIçO PúBLICO E SEU MéTODO DE OPERAçãO. Equipamento eletricamente acionado e um método de prover energia ao equipamento. Em uma modalidade, o equipamento inclui: (1) um equipamento consumidor de energia elétrica, (2) uma entrada de rede principal acoplada ao aparelho e configurada para ser acoplada a um circuito de derivação que se estende a partir de um painel de distribuição e permite que a energia elétrica a partir do circuito de derivação flua para o equipamento e (3) uma entrada de fonte de energia ligada à grade que pode ser acoplada ao menos intermitentemente à entrada de rede principal e configurada para receber energia elétrica a partir de pelo menos uma fonte de energia local e permite que a energia elétrica flua para o aparelho ou para o painel de distribuição. Em uma modalidade mais específica, o equipamento é uma unidade externa.

Hvac signaling system and method

Fan systems

A fan system may generate an air flow during use. In various implementations, a fan system may include a fan and an orifice. The orifice may include a converging section, a diverging section, and a minimum radius section disposed between the converging section and the diverging section.

Method and system for protecting a single-stage furnace in a multi-zone system

A method of protecting a single-stage furnace in a multi-zone system includes monitoring a temperature of each zone of a plurality of zones, determining if the temperature of at least one zone of the plurality of zones is less than a threshold temperature, powering on the HVAC system to satisfy a heating demand of the zone having a temperature less than the threshold temperature, monitoring an outlet temperature of the single-stage furnace, determining if the outlet temperature is greater than an outlet temperature threshold, and responsive to a determination that the outlet temperature is greater than the outlet temperature threshold, modulating a gas valve to reduce a flow of gas to the single-stage furnace.

Heat exchanger construction

A heat exchanger includes a plurality of conduits that extend between a first endplate and a second endplate. A first manifold is coupled to the first endplate to couple the first manifold to first ends of the plurality of conduits. An inlet is coupled to the first manifold to direct a first fluid into the first manifold and at least one baffle is disposed within the first manifold to form a first cavity and a second cavity. The at least one baffle of the first manifold is configured to direct the first fluid from the inlet to a first conduit of the plurality of conduits. A second manifold is coupled to the second endplate to couple the second manifold to second ends of the plurality of conduits and at least one baffle is disposed within the second manifold to form a fourth cavity and a fifth cavity.

Carbon dioxide cooling system with subcooling

A subcooling controller includes a sensor and a processor. The sensor measures one or more of a temperature external to a first heat exchanger that removes heat from carbon dioxide refrigerant, a temperature of the carbon dioxide refrigerant, and a pressure of the carbon dioxide refrigerant. The processor determines that one or more of the measured temperature external to the first heat exchanger, the temperature of the carbon dioxide refrigerant, and the pressure of the carbon dioxide refrigerant is above a threshold and in response to that determination, activates a subcooling system. The subcooling system includes a condenser, a second heat exchanger, and a compressor. The condenser removes heat from a second refrigerant. The second heat removes heat from the carbon dioxide refrigerant stored in a flash tank. The compressor compresses the second refrigerant from the second heat exchanger and sends the second refrigerant to the condenser.

Painel acessório de fonte de energia local para uma unidade externa e método para adaptar uma unidade externa ao mesmo

PAINEL ACESSÓRIO DE FONTE DE ENERGIA LOCAL PARA UMA UNIDADE EXTERNA E MÉTODO PARA ADAPTAR UMA UNIDADE EXTERNA AO MESMO. Trata-se de um painel acessório de fonte de energia local para uma unidade externa, um método para adaptar uma unidade externa ao painel acessório de fonte de energia local e uma unidade externa que incorpora o painel ou o método. Em uma modalidade, o painel inclui: (1) um suporte que tem pelo menos uma abertura de conduto elétrico e (2) um elemento de proteção de circuito montado ao suporte e configurado para ser acoplado a uma fonte de energia local, o suporte acoplável de forma removível a unidade externa em lugar de um painel de conduto elétrico convencional.

An outdoor unit having an air conditioning unit and a premises power source accessory panel

An outdoor unit, comprising: a frame; at least one refrigerant coil mounted to said frame; a fan motor coupled to a fan and configured to drive air through said at least one refrigerant coil; a compressor coupled to said at least one refrigerant coil to drive refrigerant therethrough; a controller coupled to said fan motor and said pump; and a premises power source accessory panel removably coupled to said frame and including: a bracket having at least one electrical conduit aperture, and a circuit protection element mounted to said bracket and configured to be coupled to a premises power source, said bracket removably couplable to said outdoor unit in lieu of a conventional electrical conduit panel.

System and method for sealing and supporting external pipe connections in fluid lines and directing escaped fluids to a cabinet in an hvac system

A stub pipe housing and a method for installing a stub pipe housing in a heating, ventilation, and air conditioning ("HVAC") system, the stub pipe housing comprising a first end for sealed contact with an external surface of a cabinet in the HVAC system and a non-permeable material extending to a second end for sealed contact with an external pipe. Sealed contact between the first end and the cabinet, sealed contact between the second end and the external surface, and the non-permeable material ensures any fluid escaping the connection between the stub pipe and the external pipe is directed to the cabinet. The stub pipe housing supports the connection using resilient material, rigid material with compliant seals or some combination. Fluids are directed to flow through the stub pipe opening in the cabinet or directed to flow through other openings.

Reversible heat pump with cycle enhancements

A cycle enhancement apparatus is provided. The apparatus has a first side entrance line and exit line, both connected to a first side of a refrigerant line, and a second side entrance line and exit line, both connected to a second side of the refrigerant line. One- way valves prevent flow through the first side entrance line toward the first side, through the first side exit line away from the first side, through the second side entrance line toward the second side, and through the second side exit line away from the second side. The apparatus has a cycle enhancement line. The cycle enhancement line has an entrance portion, connected to the first side entrance line and the second side entrance line, an exit portion, connected to the first side exit line and the second side exit line, and a cycle enhancement between the entrance portion and the exit portion.

Heat exchanger construction

A heat exchanger includes a plurality of conduits that extend between a first endplate and a second endplate. A first manifold is coupled to the first endplate to couple the first manifold to first ends of the plurality of conduits. An inlet is coupled to the first manifold to direct a first fluid into the first manifold and at least one baffle is disposed within the first manifold to form a first cavity and a second cavity. The at least one baffle of the first manifold is configured to direct the first fluid from the inlet to a first conduit of the plurality of conduits. A second manifold is coupled to the second endplate to couple the second manifold to second ends of the plurality of conduits and at least one baffle is disposed within the second manifold to form a fourth cavity and a fifth cavity.

Utility-interactive inverter system architecture and method of operation thereof

Electrically powered equipment and a method of powering the equipment. In one embodiment, the equipment includes: an electric power consuming apparatus (240), a mains input (210) coupled to the apparatus and configured to be coupled to a branch circuit (160c) extending from a distribution panel (150) and allow electric power from the branch circuit to flow to the apparatus and a grid-tied power source input (220) at least intermittently couplable to the mains input and configured to receive electric power from at least one premises power source (180a,180b) and allow the electric power to flow to the apparatus or the distribution panel. In a more specific embodiment, the equipment is an outdoor unit.

Dual-powered airflow generator

Dehumidifier having split condenser configuration

One aspect provides a dehumidifier that has a dehumidifying circuit and includes an evaporator, a first portion of a condensing circuit, and a first blower configured to direct a first air stream along a first flow path and through the evaporator and the first portion of the condensing circuit, for reducing the humidity of the first air stream. The dehumidifier also comprises a heat removing circuit, comprising a second blower configured to direct a second air stream along a second flow path and through a second portion of the condensing circuit for removing heat from the second portion of the condensing circuit. The first and second condensing circuits are fluidly coupled.

Icing protection for a heat pump

A protective housing is provided for a heating, ventilation, and air conditioning (HVAC) unit having a fan therein. The fan comprises a plurality of blades, each blade having a proximal and distal end. The housing comprises a plurality of side panels, each side panel comprising openings enabling airflow into the housing. The housing further comprises an access panel that is coupled between two of the plurality of side panels wherein the access panel and the plurality of side panels form an enclosure. An orifice ring is mounted within the housing, wherein a running clearance between the distal end of the fan blades and the orifice ring has a first spacing. A cover fastens atop the enclosure, the cover comprising a grill having a plurality of grill members, wherein the grill members are separated by a second spacing, the second spacing being smaller than the first spacing.

Fan systems

A fan system may generate an air flow during use. In various implementations, a fan system may include a fan and an orifice. The orifice may include a converging section, a diverging section, and a minimum radius section disposed between the converging section and the diverging section.