Method and device in closed heating plants

F - Mech Eng,Light,Heat,Weapons – 24 – H

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F24H 8/00 (2006.01) F24D 9/00 (2006.01) F24H 4/02 (2006.01)

Patent

CA 2073337

A method of utilizing the high energy values of fossile fuels in central heating boiler systems. Tie boiler system comprises a processor which include an air heat pump (5) whi~~ functions to cool the system flue gases by condensation. A first fan (10) generates a first circulation (C1) of boiler room air, via the air heat pump (5), this circulation of air also passing through a heat exchanger (4) where heat exchange takes place with the flue gases. A second air circulation (C2) is generated with the aid of a flue-gas fan (7) which removes flue gases from the boiler by suction, thereby generating a subpressure in the boiler room so that fresh air will be drawn in from the ambient surroundings, this air passing through the heat exchanger (4). A lower pressure is maintained on that side of the heat exchanger (4) on which the air/flue gas mixture (C2) flows into the heat exchanger, whereas a higher pressure is maintained on the other side of the heat exchanger (4) on which the cooling boiler-room air circulates (C1). This will ensure that flue gases will always flow out to the free atmosphere, via the heat exchanger (4).

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