HEAT COUNTER FOR HEAT DISTRIBUTION MEDIUM MEDIA

The invention concerns heat measuring instrument for the collection the transported of the thermal output by a flowing through medium or - mixes, in particular for a heat supply plant, with an adjustable jet pump, which exhibits an adjustable poppet and which with its input terminal to a source of the medium, which is to be attached cooled down medium with its suction connection to a leading line and which is to be attached mechanism which can be supplied with its exit to one with warm medium, with at least one temperature sensor for collection the temperature of the medium, to which the temperature of the medium appropriate signal supplies with, with Regelund processing mechanism, to which that or the temperature sensors is attached and/or is, is to be attached around a position default signal for the jet pump for control the same to produce and determine around the decreasing amount of heat, and with a servo unit, which is connected to the same in accordance with the position default signal with the poppet of the jet pump for adjustment. From the DE 34 17 935 A1 it is well-known to use the jet pump in a system which regulates the heat consumption without help of flow meters. In addition two temperature sensors are intended for the collection of the temperatures at the jet pump propellant connection and the system return. In addition pressure sensors serve the jet pump for the measurement of the pressure in the propellant line and the pressure in the return pipe at the suction connection. There is altogether four sensors intended, in order to provide for the computer the necessary data for adjustment the jet pump and for the determination of the amount of heat. For the determination of the heat flow or the amount of heat transported by a heat flow it is usually necessary to seize the strength of a fluid flow as well as their temperature. Appropriate measuring instruments use bspw. flow measuring instrument for the measurement of the fluid stream. The flow measuring instrument can bspw. by a Flügelrädchen in an educated manner its, which is moved by the fluid stream and whose movement is seized as measure for the fluid flow. In order to guarantee a precise function over long time, a relatively high technical expenditure is necessary with such measuring instruments. Of it is outgoing task of the invention to create simple heat measuring instrument which is suitable for heat supply plants in particular. In addition it is task of the invention to create an appropriate heat measuring procedure. In addition occasionally the enterprise of a jet pump must generally be supervised. E.G. the jet pump, ", can tilt if at its exit a too high counter-pressure lines up. This can be the case, if with the jet pump heating elements are supplied and all radiator valves are closed. The jet pump presses then over its suction connection heat distribution medium medium into the return pipe. In some cases one aims at recognizing and preventing such conditions. These tasks are solved by heat measuring instrument, which is characterized in accordance with the invention by the fact that at least one is arranged the temperature sensor for collection the temperature of the medium at the exit of the jet pump that Regelund processing mechanism determined the difference between one of the temperature sensor for the production of the position default signal actual temperature and a given target temperature for adjustment the poppet of the jet pump by means of their servo unit forms, in order at the exit of the jet pump the desired target temperature to receive, and that processing mechanism, to which the signal at least temperature sensor and the position default signal or the attitude of the jet pump appropriate signal supplied by a sensor facility is supplied determines Regelund exclusively from these the flowed through thermal output and/or amount of heat. In favourable way only one temperature sensor at the jet pump exit is necessary during the heat measuring instrument according to invention, even if the propellant temperature and the return temperature as well as the appropriate pressures are not constant. The heat measuring instrument according to invention exhibits an adjustable jet pump, whose attitude of a position default signal is given for flow measurement. The position default signal or the position default signal and/or the steel pump attitude appropriate size is taken as measure for the flow. The position default signal knows or it appropriate size both and measure for the supply, i.e. men the river to the driving nozzle of the jet pump and as measure for the quantity of the delivered fluid genomAT 411,494 B become. The flow concerned is consulted then with the measured appropriate fluid temperature to compute the thermal output and/or the amount of heat. In the simplest case this is a multiplication of the appropriate signals. Further arrangements of the heat measuring instrument according to invention are characterized in the Unteransprüchen 2 to 11. The invention concerns also a procedure for seizing the thermal output of a heat fluid flowing by a Erfassungsstelle, which is characterized by the fact that the heat distribution medium fluid is led by a jet pump, which adds cooled down heat distribution medium fluid to the heat distribution medium fluid that the jet pump is adjusted in each case in such a manner by means of a controlling mean always that at their exit independently of the throughput a constant inlet temperature is present that the attitude of the jet pump is seized and converted into a position signal that the temperature of the heat distribution medium fluid at the entrance or at the exit of the jet pump as well as in a return is determined that from the entrance temperature or the output temperature and the return temperature a temperature difference signal the heat distribution medium fluid is formed and that from the temperature difference signal and the position signal Product is formed, which is consulted as measure for the current thermal output. The product is summed according to invention or integrated for the determination of the amount of heat. With appropriate heat measuring instrument as well as the procedure concerned the measurement of the thermal output and the collection of the amount of heat are possible, without having to use flow meters. As flow meter the jet pump serves, whereby their attitude, i.e. bspw. the position of a poppet, which cooperates with the driving nozzle, when measure for the flow is taken. It was shown that this in particular rightfully precise results of measurement leads if the jet pump is regulated on a constant or at least given output temperature and at its suction connection admixture fluid, heat distribution medium fluid e.g. cooled down receives the output temperature can e.g. weather-led, i.e. be time-dependent. The “output temperature” can be the inlet temperature or the supply air temperature (temperature of delivered air) of an attached heating element. This has meaning during the seasoning of wood. Here heat counters are necessary, in order to steer the drying procedure. A temperature measurement and - regulation alone is not usually sufficient. A measurement is aimed at and/or. Regulation or controlling of the amount of heat registered into a drying room. The invention makes the omission possible of the otherwise usual expensive Durchflusszähler for heat flow collection. With more constant or at least well-known temperature at the jet pump exit the valve position corresponds to the flow on little per cent exactly. An appropriate functional connection that linear or nonlinear to be can be put down, can in an appropriate storage facility of the processing mechanism and serve for it to determine from the position default signal or this appropriate size the flow. Possibly together with a servo unit the jet pump forms thus a completely pre-mountable building group, which both when, and as flow measuring instrument serves rule organ for the advance of the subordinate system, which is possible however also if installs the sensors and the servo unit only at the structure place and bspw. at some distance of the jet pump to be arranged. The pre-mounted building group building method avoids however assembly errors and supplies a compact and robust arrangement. The control drive of the jet pump can be a proportional drive, which stops the position default signal appropriate valve stem position. Favourable way is the control drive however a motor drive, which receives a signal only if the valve stem is to be adjusted. The position of the valve stem is marked by the position default signal or a position signal, which gives the position of the valve stem. The position signal can bspw. the position default signal its, by a valve stem position sensor to be supplied or in the controlling mean as the adjustment of the valve stem determining signal be produced. Anyhow the determination of flow without separate flow meter at the attitude of the jet pump takes place. Favourable details of execution forms of the invention are subject to Unteransprüchen, the design and/or the description. In the description of figure remark examples of the invention are illustrated. Show: Fig. 1 a heat supply system with heat measuring instrument according to invention, in RK 411,494 B of schematized representation, Fig. 2 a processing mechanism of the heat measuring instrument after figure 1 as block diagram, Fig. 3 a processing mechanism for the heat supply plant and heat measuring instrument after figure 1, in a modified execution form as block diagram, Fig. 4 a processing mechanism for the heat supply plant and heat measuring instrument after figure 1, in an execution form as block diagram, Fig, modified further. 5 a further execution form of heat measuring instrument for a heat supply plant, in principle representation, lo Fig. 6 a processing mechanism for the heat measuring instrument after figure 5, as block diagram, Fig. 7 a jet pump with control drive and temperature sensors, in Iängsgeschnittener and schematized principle representation, Fig. 8 a further execution form of heat measuring instrument for a seasoning of wood plant, in principle representation, and Fig. 9 a jet pump with operating supervision, in schematized representation. In figure 1 a heat supply plant 1 is illustrated, which serves 2 for the heat supply of an only schematically illustrated heat consumer. The heat transport takes place by means of a heat distribution medium fluid, as bspw. Steam, oil, warm water or hot water. In the available remark example the heat distribution medium is water. This becomes at a line. 3 made available, whereby the decrease taking place at this line 3 is to be seized. By decrease both the current thermal output, and the amount of heat decreasing supplied over a gate time area altogether or can have to be understood. The heat consumer 2 needs 04 heat distribution medium fluid, i.e. water with an need-appropriate temperature at a mixture advance. In the simplest case this is a firmly given temperature. Need way can be specified the desired temperature level (target temperature) also time-dependently as well as dependent on other parameters such as outside temperature, interior temperature, wind velocity or other parameters. For the supply of the heat consumer, a jet pump 5, which is schematically in figure 7 illustrated, serves 2 with water of the desired temperature. The jet pump 5 exhibits an entrance 6, a suction connection 7 and an exit 8. The entrance 6 leads to a driving nozzle g, on whose stromabwärtiger side a female nozzle 11 and a diffuser 12 are arranged. Between the female nozzle 11 and the driving nozzle 9 a suction gap 14 is limited, with the suction connection the 7 communicates. At the entrance 6 an entrance temperature sensor 15 is arranged. At the suction connection 7 a return temperature sensor 16 is and at the exit is arranged an output temperature sensor 17. For adjustment the fluid stream passed by the driving nozzle 9 serves a poppet 18, which is held at a valve stem 19. This is adjustable in its axial position by a control drive 20, bspw. by a gear motor, a stepping motor or a similar servo unit one forms. The servo unit has the task to adjust the poppet accordingly a position default signal. The poppet 18 with valve stem 19 and actuator 20 form at the driving nozzle 9 a servo unit 21, for adjustment for the jet pump. With the heat supply plant 1 illustrated in figure 1 the jet pump 5 with their entrance 6 to a Vorlaufleitung 01 and attached with their exit 8 to a mixture advance 04 is. A return 02, which leads cooled down heat distribution medium fluid (water), arriving from the heat consumer 2, is finally attached to a return pipe 22. From the return 02 a line 23 branches, which leads to the suction connection 7 of the jet pump 5. The actuator 20 and at least the output temperature sensor 17 are attached to Regelund processing mechanism 25, which in figure 1 schematically illustrated and from detailed figure 2 is to be taken. A controlling mean 26, which is attached with an entrance 27 to the output temperature sensor 17 and with an exit 28 to the actuator 20, contains Regelund processing mechanism 25 illustrated in figure 2. At the entrance 27 the temperature is present in the mixture advance 04 characteristic signal (actual temperature signal). A block 29 due to the controlling mean 26 gives the desired temperature tsoù at the mixture advance 04. A comparator stage 31 compares the actual temperature with the target temperature and delivers at their 4 RKs 411,494 B exit the difference between both characteristic signal. This is supplied to the controlling mean 32, whose exit gives then the position of the poppet 18 by the position default signal at the exit 28. This signal is supplied a processing mechanism 33, like the controlling mean the 26 to Regelund processing mechanism 25 is heard. That the position of the poppet 18 and thus the attitude of the jet pump 5 characteristic signal goes through a functional module 34a, a clear function connection between the poppet position and the mass flow rh01 valve position, within the processing mechanism 33 first i.e. the stroke of the poppet 18 and the mass flow rh01 of a reverse curve or a parameterized curve family, existing at the advance 01, which can be put down in a memory. The mass flow rh01 jet pump 5 Iässt determine. In addition a computing block 34 is intended, that out rho the value rn04 nung, a characteristic or a family of characteristics takes place in the processing mechanism 33. The mass flow rh04 jet pump is valid to a large extent independently of difference of pressure between the entrance 6 and the suction connection 7th Bspw. is to be usually counted with a duplication or a halving of the pressure on a change of the mass flow by less in each case than 5%. The computing block 34 receives a temperature signal, which gives to the temperature t04 and thus at its exit a signal P04 draws at another entrance. This signal P04 or summed up and thus the thermal output Q computes, which was removed over the advance 04. The jet pump 5 forms heat measuring instrument 36, which works as follows with the servo unit 21 and Regelund processing mechanism 25: Against the line 3 hot heat distribution medium fluid rests. The block 29 gives the target temperature for the heat distribution medium fluid, with which the consumer is to be supplied 2 via the advance 04. Accordingly the rule loop 26 adjusts the jet pump 5 by attitude of the position of the poppet 18 constantly in such a way that also at varying fluid speed, bspw. due to wechseinder temperature drop by the heat consumer 2 in the advance 04 the actual temperature with the given target temperature in agreement one brings in each case. According to the temperature drop by the heat consumer 2 thereby the position of the poppet 18 changes. This poppet position is at the exit of the automatic controller 32, bspw. a proportional action controller, a proportional plus reset controller or an PID automatic controller to be can, as default signal for the position of the poppet 18 available. This signal is rated of the processing mechanism downstream as measure for the flow. This measure is used in the blocks 34, 34a for the computation of the mass flow rn0 “in the advance 04. The product of rh04 at least under a condition of a constant return temperature the looked for thermal output P04. This is integrated by the block 35 to the decreasing amount of heat Q. A modified execution form Regelund processing mechanism 25 is to be inferred from figure 3. The signal emitted by the automatic controller 32 marks the position, which is to be taken by the poppet 18. This signal pos is the default signal for a Positionsregler 40. This is not with an entrance 41 at far illustrated position sensor, the part the jet pump building group illustrated in figure 7 to be attached can. The Positionsregler 40 receives the actual signal, which marks the valve stem position at its entrance 41. It adjusts the poppet 18 over the exit 28 to the desired position. Accordingly the processing mechanism downstream 25 attached to the position entrance 41 is, in order with a signal marking the poppet position to be supplied. Alternatively an appropriate automatic controller quality of the automatic controller 40 can be presupposed the entrance of the block 34a, i.e. the processing mechanism of 25 also to the signal pos, i.e. the exit of the automatic controller 32 attached. With Regelund processing mechanisms 25 after the figures 2 and 3 one is possible in the figures not illustrated modification. This modification lies in the fact that in place of the temperature t04, which is measured by the output temperature sensor 17 the temperature t01 is supplied, which is supplied by the entrance temperature sensor 15. The entrance of the block 34 lower in the figures 2 and 3 RK 411,494 B, which forms a temperature entrance, is not thus to the entrance 27, but attached to not far illustrated separate entrance, which leads the entrance temperature sensor to 15. The entrance 27 is still connected with the output temperature sensor 17. With this execution form the conversion of the mass flow rh01 knows a further improved execution form Regelund processing mechanism 25 with which the return temperature may take variable values, is illustrated in figure 4. As far as agreement with figure 2 exists, to the appropriate description one refers. In contrast to the execution forms described in connection with figure 2 however an additional temperature entrance 42 is intended at Regelund processing mechanism 25, which is connected with the return temperature feeler 16. To the entrances a difference education circuit (subtracting circuit) is attached 27, 42 43, which delivered at its positive entrance the inlet temperature t04 at their exit a signal, which marks the temperature difference between advance 04 and return 02. This signal will is received in the block 34 with the mass flow rh04 integration into the block 35 the altogether removed amount of heat Q. A Iässt the figures 5 and 6 infer themselves from far refined execution form. In figure a jet pump building group 5 is illustrated ', which as pre-mounted block serves both the adjustment of the inlet temperature for a subordinate heat consumer, that is supplied via the advance 04, as well as the collection of the delivered amount of heat. This in connection with Regelund processing mechanism 25, which is attached with this execution form to all sensors 15, 16, 17 as well as, if necessary, to a position sensor for the collection of the valve stem position (line 44). In figure 6 at the entrances concerned Regelund the reference symbols of the respective sensors as well as the actuator are noted processing mechanism 25, which are attached to the entrance concerned. The controlling mean 26 adjusts t04 actuator 20 in such a way on the basis the measured temperature that the desired inlet temperature toù is reached, which is given by an external signal firmly or. The computation of the decreasing amount of heat takes place on basis mass flow rh01 difference decreasing from the jet pump or the jet pump building group 5 of the ' between advance 01 and return 02. For the determination a subtracting stage 46 serves this temperature difference. Their output signal corresponds to the temperature difference? t01 _0” the multiplying stage 34 forms the thermal output P, which is integrated by the Zähleroder integrating stage 35 from the signal rh0 and the temperature difference. With this execution form it is possible to consider in the stage 34a pressure changes of the system even if this disappears only to one small influence on the seized amount of heat has. Thus the precision of the heat measuring instrument can be further increased. Bspw. a subtracting stage 47 forms a difference of pressure between the pressure in the advance 01 and in the return, seized over sensors, 02. The formed difference of pressure? P is supplied to the characteristic block 34a, which selects appropriate characteristic from a Kennlinienschar for the conversion of the valve position to the mass flow rh01 of the difference of pressure. Accordingly the temperature t can be consulted for the selection of a suitable characteristic. As suggested in figure 5, Regelund processing mechanism 25 permits the bedarfsweise delivery of a further signal on a line 48. This line can bspw. to operate from the return temperature a t02 of outside air heater of this signal steered. With will it possible switching the outside air heater on only then if the return temperature, which is measured by the return temperature feeler 16, crossed a limit value, so that freezing outside air registers is prevented when starting a plant. In addition the complete Überwa.chung of the jet pump 5 by means of the three temperature sensors 15, 16, 17 permits a Uberwachung on normal enterprise, so that tilting the jet pump can be prevented effectively. If the mixture advance 04 is closed off, pushing the heat distribution medium through of the advance 01 into the return 02 by increased temperature by the return temperature feeler 16 can be recognized immediately and be prevented by latches of the jet pump RK 411,494 B. During the presented heat measuring instrument an additional regulatory contact at the return 02 or in the line can be made 23. This bspw., in order to keep the temperature difference between the mixture advance 04 and the return 02 better constant. The flow collection by the jet pump is not impaired thereby. In figure 8 an application of the heat measuring instrument according to invention at a baking oven 51 is illustrated. The baking oven 51 serves bspw. drying wood by means of preheated air. For air heating up an air heating element 52 is intended, which flowed through Al from outside air. In addition a blower serves 53, which supplies the drying room 51 with warm air. From the drying room 51 sucked off air is promoted by means of an exhaust air blower as waste air flat steel bar to the free. The temperature that the drying room 51 supplied air is seized over a temperature sensor 17 '. This replaces the temperature sensor 17, as he is intended with the execution form after figure 1 or 5. The air heating element 52 is fed over the jet pump 5. Accordingly it is supplied via the advance 04 with heat distribution medium fluid of the desired temperature. The jet pump 5 is attached with their suction connection 7 to the return 02, at which a return temperature sensor 16 is arranged '. This replaces the temperature sensor 16 of the managing execution forms. Otherwise to a large extent agreement with the previous execution forms exists, so that explanation for the sake of on these one refers. With the plant after figure 8, furnished for seasoning of wood, the control equipment seizes the supply air temperature of the drying room 51, which agrees essentially with the inlet temperature of the advance 04. From the temperature difference between with the temperature sensor the 17 ' measured temperature and the temperature measured with the temperature sensor 16 ' determines the control equipment 25 the secondary temperature difference? R-S. From the position of the control member of the jet pump 5, which corresponds to the control signal on a line 20 leading from the control equipment 25 to the servo unit 20 ', the control equipment 25 determines the secondary mass flow r: n04. The product of rh04, certain in the further one of the control equipment 25, led amount of heat. Far illustrated default unit, which can be also part of the control equipment 25, now the jet pump 5 does not steer in such a way that at each time the desired amount of heat is supplied to the drying room 51. In particular jet pump control drives 20 are preferred, which a constant control signal is to be supplied, which gives the poppet position directly. Bspw. jet pumps are used, whose control drive 20 of a control voltage between 0 V and 10 V is to be steered, whereby the jet pump is with 0 V control voltage completely to and with 10 V of control voltage whole on. A control voltage of 5 V corresponds bspw. 50%er opening. In addition the jet pump and/or its control drive can be provided with a Ferngeber, which supplies an appropriate position signal to the control unit 25. In addition in figure 9 the monitoring of a jet pump 5 on normal enterprise is illustrated. A control device 55 seized over an appropriate sensor 17 the temperature at the advance 04 as well as over a sensor 16 the temperature at the suction connection 7 of the jet pump 5.Bspw is this the temperature of the return 02. On the basis the seized temperatures the Uberwachungseinrichtung can seize 55 whether the jet pump 5 works duly. If this is the case, the temperature measured at the suction connection 7 is lower than the inlet temperature those the sensor 17 supplies. However in the circle attached to the advance 04 a too high counter-pressure is developed, bspw. by all heat consumers to be closed off (bspw. closed), the jet pump 5 bends to tilt all radiator valves to deliver i.e. from the advance 01 coming heat distribution medium fluid to the suction connection 7. In this unwanted operating condition the temperature at the suction connection 7 rises abruptly, which seizes the control device 55. If the temperature at the suction connection 7 reaches the inlet temperature, those the sensor 17 measures or if this exceeds, the jet pump 5 tilted. It is closed accordingly by the control equipment 55. Alternatively in particular a valve 56 over an appropriate control drive 57 arranged in the advance 01 can be closed with jet pumps without servo unit. Supplementing or alternatively also primärund secondary seized WärmemenAT know 411,494 B towards to be compared. The attitude of the jet pump Iässt, as managing describes, on m01. and m04., i.e. primärund the secondary heat distribution medium mass flow close. By multiplication with the temperature difference corresponding in each case? t” and/or? ts (? tp = t01? t, = t04 unequally, points this to an inadmissible operating condition of the jet pump 5, whereupon this can be switched off likewise. The restart of the jet pump can be tried by an external signal or time-steered. In heat measuring instrument and a control device a jet pump serves both and controlling mean and can serve additionally also for the collection of the flow. The flow through the jet pump is derived from the position of a poppet 18, with which the driving nozzle is adjustable 9 of the jet pump 5. The jet pump 5 is regular thereby on an output temperature. With a preferential execution form 5 temperature sensors 15, 16, 17 are arranged at the jet pump, which supply the signals necessary for the regulation and temperature collection.