Stoves and furnaces – Liquid heater – Boiler receiving hot liquid or steam from stove or furnace
Patent
1989-02-21
1990-06-26
Dority, Carroll B.
Stoves and furnaces
Liquid heater
Boiler receiving hot liquid or steam from stove or furnace
417300, 219309, F24H 100
Patent
active
049362895
ABSTRACT:
An energy conservation apparatus for controlling the operation of a recirculating hot water distribution system which comprises of a hot water heater (15) having an outlet (17) and an inlet (16); a return pipe (24) interconnecting the end of the supply pipe back to a tee (25) on the makeup water inlet to form a loop; and an electrically operated recirculating pump (26) in the loop, usually on the return pipe, that circulates the hot water around the loop. Thus hot water is available anywhere in the system without having to first discharge any cooled hot water that has been standing in the piping. The invention consists of a sensitive flow sensor or usage detection device (33) located on the unheated makeup water supply and connected to a controller (34). The controller turns on the recirculating pump only when hot water is draw from any of the usage points. The invention saves energy by reducing the heat loss from the hot water distribution system. Options are available to prevent false activation due to system leakage, to prevent activation on very short usages, to turn off or prevent the activation of the system if the distribution system is already hot, to run the pump for a preset minimum time and/or to monitor leakage or sensor problems in the system.
REFERENCES:
patent: 3575157 (1971-04-01), Whittel
patent: 4142515 (1979-03-01), Skaats
patent: 4201518 (1980-05-01), Stevenson
patent: 4498622 (1985-02-01), Harnish
patent: 4606325 (1986-08-01), Lujan, Jr.
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