Heat recuperator and method for use with gas-fired furnace...

Details Heat recuperator and method for use with gas-fired furnace... Heat recuperator and method for use with gas-fired furnace...

F - Mech Eng,Light,Heat,Weapons

23

C

158/18

F23C 7/06 (2006.01) F23L 15/04 (2006.01)

Patent

CA 1195913

"IMPROVED HEAT RECUPERATOR AND METHOD FOR USE WITH GAS-FIRED FURNACE USING NOZZLE OR PRE-MIX BURNERS" ABSTRACT OF THE DISCLOSURE A heat recuperator and a method for recuperating heat from a furnace having a nozzle-mix burner to enhance the efficiency of combustion of one or more burners associated with the furnace. The recuperator comprises an exhaust tube which is connectable to a furnace combustion chamber for receiving heated exhaust gas therethrough. The exhaust tube has an outer cylindrical wall and an inner metallic tube concentrically supported therein. An annular space is defined between the outer cylindrical wall and the inner tube. The inner tube is formed, in at least a major length thereof, with a plurality of corrugations. An air inlet connection is provided at an inlet end of the annular space downstream of the exhaust tube. The annular space also has an outlet upstream of the exhaust tube adjacent an inlet end thereof and connectable to a burner supplying same with heated combustion air. A blower is connectable to the inlet to direct the flow of ambient air in the annular space from the inlet to the outlet of the annular chamber. The corrugated wall induces turbulence to the ambient air and also provides a large heated surface area to enhance heat exchange between the heated exhaust gas and the ambient air. - 1 -

462070

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