Stoves and furnaces – Hot-air furnaces – Preliminary air heater
Patent
1984-06-25
1985-12-17
Yeung, James C.
Stoves and furnaces
Hot-air furnaces
Preliminary air heater
126109, 126 99A, 126 99D, 126110R, 237 55, 165901, F24H 312, F24H 302
Patent
active
045586896
ABSTRACT:
A secondary heat exchanger is positioned within a cold air return plenum of a forced air gas or oil fired furnace to preheat cold air drawn into the furnace through the cold air plenum. A heat recovery flue pipe is connected between a primary flue pipe of the furnace and the secondary heat exchanger, and an exhaust pipe is connected between the secondary heat exchanger and the outside of a structure served by the furnace. A secondary blower coupled to the exhaust pipe draws hot combustion gases from the primary flue pipe through the heat exchanger and exhausts cooled combustion gases to the outside. The secondary heat exchanger comprises a combustion gas inlet plenum and a combustion gas outlet plenum, with a plurality of heat conducting pipes sealingly connected therebetween. Each of the heat conducting pipes is arranged to define a circuitous path between the inlet plenum and the outlet plenum, with each heat conducting pipe defining at least two aligned linear radiating surfaces over which cold air is drawn. Heat conducting fins are intimately connected to the heat conducting pipes and a condensate drain is provided in the lower extremities of the heat conducting pipes to drain condensate from the secondary heat exchanger.
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Odar H. A.
Yeung James C.
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