Unit heater and heat exchanger therefor

Details Unit heater and heat exchanger therefor Unit heater and heat exchanger therefor

F - Mech Eng,Light,Heat,Weapons

24

H

F24H 3/02 (2006.01) F24H 3/10 (2006.01) F28D 9/00 (2006.01) F28F 3/04 (2006.01) F28F 13/08 (2006.01)

Patent

CA 2081620

Poor heat exchange in a neat exchanger between a flue gas passing through the heat exchanger and air being forced through the heat exchanger can be improved in a heat exchanger and combustor (30) for exchanging heat between a forced air stream and a flue gas generated by a plurality of spaced, parallel burners (44) with a construction including spaced, upper and lower headers (32, 34), a plurality of tubes (50), one for each burner (44) extending in parallel between and mounted to the headers (32, 34). Each tube 50 has a first section (56) of enlarged cross section adapted to serve as a combustor for fuel to generate the flue gas and a narrowed, second section (70) for exchanging heat between the flue gas and the forced air stream. Each second section includes generally flat, parallel spaced walls (58, 60) with each of the walls (58, 60) having dimples (74) therein which are directed toward the other of the walls (58, 60) into substantially contacting or almost contacting relationship therewith.

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