Efficient gas hot-air furnace and heating process

Details Efficient gas hot-air furnace and heating process Efficient gas hot-air furnace and heating process

1989-06-08

1991-04-09

Davis, Jr., Albert W.

Stoves and furnaces

Hot-air furnaces

Compressed air

126110B, 126110D, 126110C, 165 7, 165 10, F24H 306, F28D 1904

Patent

active

050055569

ABSTRACT:
Substantially all available heat from a combustion gas stream is extracted by passing it through a cool, porous heat sink, which is thereby heated, and then releasing that heat into a cool air stream blown through the same porous heat sink in a second step (preferably in the opposite flow direction). The heat sink absorbs substantially all the available heat of combustion rather than merely scavenging what would otherwise be stack losses. The invention provides an improved means of recovering virtually all the available heat produced by combustion of a fuel gas. It permits recovery of the heat lost in a conventional single-zone furnace. The improved heat recovery is achieved without contamination of the ambient air with exhaust gas residues as occurs in direct-fired systems, and without incurring the problems of corrosion and waste disposal inherent in two-zone indirectly-fired systems. The invention differs from traditional stack-gas heat-salvaging processes in that there is only one heat transfer zone for transferring combustion heat to an ambient air stream.

REFERENCES:
patent: 3338300 (1967-08-01), Turunen et al.
patent: 3695250 (1972-10-01), Rohrs et al.
patent: 3823766 (1974-07-01), Sawyer
patent: 4754806 (1988-07-01), Astle Jr.
patent: 4836183 (1989-06-01), Okuno et al.
patent: 4909190 (1990-03-01), Finch
Energy Conservation Through Heat Recovery, Northern Natural Gas Company.
Z Duct Energy Recovery Unit, Des Champs Laboratories, Inc. Bulletin 3-75C, 3 Drawings, and 2 Sheets of Performance Data.

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