Stoves and furnaces – Hot-air furnaces – Liquid or gaseous fuel
Patent
1999-02-03
2000-08-29
Lazarus, Ira S.
Stoves and furnaces
Hot-air furnaces
Liquid or gaseous fuel
126 67, F23N 300
Patent
active
06109255&
ABSTRACT:
A modulating furnace includes a first air flow path which directs supply air to one or more combustion burners and through a heat exchanger, and a second air flow path which directs supply air around the one or more burners and heat exchanger. When the firing rate of the burners is lowered, the amount of air to the burners is reduced by diverting a greater fraction of the supply air to the second air flow path. When the firing rate of the burners is raised, less supply air is diverted resulting in greater flow to the burners. The duct furnace achieves ideal combustion at high and low firing rates by maintaining an ideal balance between firing rates and air supplied to the burners.
REFERENCES:
patent: 2221750 (1940-11-01), Ashby et al.
patent: 4373897 (1983-02-01), Torborg
patent: 5158446 (1992-10-01), Hall
patent: 5687708 (1997-11-01), Farnsworth et al.
Reznor Duct Furnaces, Specifications and Techical Guide, Form No. RGM-C-DF-A.1, Thomas & Betts Corporation, Mar. 1996.
Reznor Indirect Fired Heating & Make-up Air Products Specifications and Techical Guide, Form No. RGM-C-PH-A, Thomas & Betts Corporation, Aug. 1995 .
Dieckmann John T.
Gauba Gautum
McFadden David H.
Specht Werner
Clarke Sara
Gas Research Institute
Lazarus Ira S.
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