Flue gas/combustion air heat exchanger

Details Flue gas/combustion air heat exchanger Flue gas/combustion air heat exchanger

F - Mech Eng,Light,Heat,Weapons

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F24H 3/12 (2006.01) F24H 3/06 (2006.01)

Patent

CA 1265038

Title FLUE GAS/COMBUSTION AIR HEAT EXCHANGER Inventors Thomas E. Allen Patrick B. Sowada Abstract A flue gas/combustion air heat exchanger for a furnace. The furnace includes a combustion chamber that burns a mixture of fuel and combustion air to produce heat for a comfort zone. The resulting pro- ducts of combustion, along with any waste heat not transferred to the zone, pass through a flue duct before venting to atmosphere. Incoming combustion air is discharged across the relatively hot flue duct before it enters the combustion chamber. In passing across the hot flue duct, the incoming combustion air is preheated by waste heat of the combus- tion products. The heat exchange relation between the incoming combus- tion air and the combustion products within the flue duct enables the furnace to recover waste heat that would otherwise be lost if the com- bustion products were free to discharge to atmosphere before giving up a portion of their waste heat to the incoming combustion air.

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