Automatic temperature and humidity regulation – Hot-air furnace
Patent
1980-10-23
1983-08-30
Cline, William R.
Automatic temperature and humidity regulation
Hot-air furnace
237 55, 237 19, 165 39, 165DIG2, 122 20B, F23M 102
Patent
active
044012616
ABSTRACT:
A flue gas heat recovery apparatus is employed with a system of appliances such as a gas furnace and hot water heater, each having separate exhaust gas flues. The apparatus includes a gas-to-liquid heat exchanger in thermal communication with the two flues to simultaneously extract heat therefrom and a liquid-to-gas heat exchanger disposed within the furnace cold air return duct. A pump circulates water between the exchangers in response to a control signal to employ the recovered heat to preheat the cold air entering the furnace through the cold air return duct. A hysteretic control circuit monitors exhaust gas temperature and provides for system operation between high and low gas temperature limits. In the preferred embodiment of the invention, a furnace blower override feature is employed to energize the blower during periods of pump operation.
REFERENCES:
patent: 1633759 (1927-06-01), Breese, Jr.
patent: 1941496 (1934-01-01), Scyleh
patent: 2237054 (1941-04-01), Jensen
patent: 2482746 (1949-09-01), Crozier
patent: 3726473 (1973-04-01), Sapir
patent: 4066210 (1978-01-01), Pemberton
patent: 4194558 (1980-03-01), Goosman
patent: 4210102 (1980-07-01), Dosmann
patent: 4258878 (1981-03-01), Van Pachtenbeke
Cline William R.
McNally John F.
VanOphem Remy J.
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