21-01-2021 дата публикации
Номер: US20210018221A1
A tankless water heater system (), with a heat exchanger device () comprising at least one hollow chamber ( ) and at least one electrical heating element (), and: 11002021222324525354. A tankless water heater system () , with a heat exchanger device () comprising at least one hollow chamber ( , , , ) and at least one electrical heating element ( , , ) , further comprising at least:{'b': 30', '35', '32', '33', '34, 'a controller device () with a temperature control unit (), a tap event counter unit (), a down-time counter unit () and a time delay unit ();'}{'b': 41', '42', '43', '52', '53', '54, 'an electrical switching element (, , ) for connecting or disconnecting one or several heating elements (, , ) to/from a power supply;'}{'b': 27', '35, 'an outlet temperature sensor () linked with the temperature control unit ();'}{'b': '29', 'a flow rate sensor ();'}wherein:{'b': 32', '29, 'sub': '1', 'the tap counter unit () is connected to the flow rate sensor () and is triggered when water flow rate exceeds a tap indication threshold {dot over (V)}'}{'b': 33', '32, 'the down-time counter unit () is triggered and retriggered by the tap counter unit () and both provide a down-time event signal after any inactivity period with no water flow and records the duration of inactivity;'}{'b': 34', '32', '33, 'sub': 'OFF', 'the time delay unit () is connected to and triggered by the tap counter unit () starting a delay period Δtwhich duration is switched from a short default delay period to a long delay period by the down-time signal provided by the down-time counter unit (); and'}{'b': 41', '42', '53', '34, 'the switching elements (, , ) are triggered by the time delay unit () only after the delay period has elapsed.'}233. The tankless water heater system of claim 1 , wherein the long delay period is increased by each down-time signal provided by the down-time counter unit () until a maximum delay period is reached.310030313233343530. The tankless water heater system () of claim 2 ...
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