F - Mech Eng,Light,Heat,Weapons – 28 – D
Patent
F - Mech Eng,Light,Heat,Weapons
28
D
F28D 7/04 (2006.01) F23J 13/00 (2006.01) F24H 1/18 (2006.01) F24H 9/00 (2006.01)
Patent
CA 2499775
A flue gas heat recovery system for improving the thermal efficiency of a water heater. The flue gas heat recovery system is applied to a tank-type water heater. The flue gas heat recovery system comprises of a heat exchange assembly, a circulating pump, draft fan, piping, and a condensate drain pipe. The circulating pump and draft fan start automatically when the water heater is in operation. The draft fan allows the flue gas to overcome the pressure drop through the heat exchange assembly. The pump circulates water in a closed pipe loop between the water heating tank and the heat exchange assembly located in the flue pipe. Sensible and latent heat in the flue gas is transferred through the heat exchanger to the cold water being drawn from the water heating tank by the pump. The warm water is then returned to the water heating tank by the pump. Condensate in the flue pipe is directed to a drain pipe. The flue gas heat recovery system could also be applied to an tankless water heater. No circulating pump is required since water heater operation and subsequent heat recovery only occurs when cold water is flowing. The preheated water is further heated as necessary by the tankless water heater.
Lai Patrick M. H.
Na
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