Stoves and furnaces – Fireplaces or accessories – With air pump
Patent
1989-07-27
1991-09-10
Yeung, James C.
Stoves and furnaces
Fireplaces or accessories
With air pump
126523, 165146, 165903, 237 55, F24B 1189
Patent
active
050464817
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to heating apparatus, particularly of the type which makes use of heat from existing heating or cooking apparatus.
Open fires, closed fires, boilers, cookers (solid fuel, oil or gas), ceiling mounted radiant gas heaters and etc, loose valuable heat to the outside atmosphere without the benefit of all the heat generated having contributed to the inside atmosphere of the home or workplace.
Heat is transmitted by three means; Radiation, Convection and Conduction. Most of the heat transmitted to the room from an open fire is by radiation. No convected heat emits from an open fire--it cannot. All the convected heat and most of the conducted heat--which conducted heat in turn transfers to convected heat in the main as air passing over the fire surrounds draws on that heat and takes it away up the flue--is lost up the flue and in turn to the outside atmosphere.
All fires--unless supplied with air for combustion in a sealed ducted source from the exterior--actually lower room temperature for some time after starting up. An open fire on an exterior wall is at best 10% efficient, on an interior wall is at best 20% efficient. A free standing closed solid fuel fire is at best 30% efficient. Solid fuel, oil or gas cookers are at best 53% efficient. Ceiling mounted radiant gas heaters are at the 30% efficient, and wall mounted radiant/convector gas heaters are at best 50% efficient. Solid fuel, oil or gas boilers are in the 50%-60% efficiency range with the most efficient being a very low output gas boiler in the region of 74% efficiency. These figures take into account all the heat generated which actually finds its way first to the interior including that which bleeds through the linings and structure of the flue to the interior. The remaining percentage is the heat energy which is lost to the outside atmosphere without benefit to the purpose for the heating system--this is the heat lost up the flue in the form of the convected heat generated in the system, and in turn a part of that convected heat which is converted to conducted heat and lost through the exterior lining and structure of the flue.
BRIEF SUMMARY OF THE INVENTION
An object of this invention is to provide heating apparatus which makes use of the otherwise wasted heat and returns it back to the interior of the area being heated.
According to the present invention, there is provided heating apparatus for heating an environment, comprising a passage defining a flowpath for warm gas, the flowpath being adapted to pass warm gas past a plurality of heat exchange tubes generally transverse to the flowpath and spaced therealong, the tubes forming at least in part at least one heat exchange conduit adapted to carry air through the flowpath from a downstream to an upstream part thereof in indirect heat exchange, and air-flow inducing means for inducing a flow of air in the or each conduit and thence to the environment, characterized in that the spacing between adjacent tubes progressively decreases in the downstream direction of the flowpath thereby in use progressively improving the rate of heat exchange between the air and the warm gas.
Preferably one or more heat exchange conduits comprises one or more first banks of parallel tubes extending into a heat flow path, the inlets of the tubes being operatively connected to air flow-inducing means, and one or more second banks of parallel tubes connected directly or indirectly to the outlets of the first tubes and extending out of the heat flow path.
Preferably, the one or more heat exchange conduits comprises a plurality of parallel tube elements which provide a sinuous flow path for air.
Preferably the or each heat exchange conduit is in the form of a continuous tube.
Heating apparatus according to the present invention comprises a plurality of banks of tubes for parallel spaced location in the path of a flow of heat, each bank being in intercommunication with the or each end adjacent bank by passage means and so disposed that the bank nearest the heat source i
REFERENCES:
patent: 1334741 (1920-03-01), Dundon
patent: 1627265 (1927-05-01), Bancel
patent: 2613065 (1952-10-01), Didier
patent: 2882023 (1959-04-01), Rizzo
patent: 3905351 (1975-09-01), Hatfield
patent: 4550772 (1985-11-01), Knoch
patent: 4805692 (1989-02-01), Palmer et al.
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