Engine-driven heat pump apparatus and method for stable operatio

Details Engine-driven heat pump apparatus and method for stable operatio Engine-driven heat pump apparatus and method for stable operatio

1996-02-08

1997-05-27

Tapolcai, William E.

Heating systems

Automatic control

Heat source is a reverse cycle refrigerating system or heat...

622283, 622387, 163240, F25B 2700

Patent

active

056324421

ABSTRACT:
An engine-driven heat pump apparatus having a refrigerant circulation line which includes a pressure-measuring device for measuring the pressure in the refrigerant circulation line downstream of a compressor and upstream of an expansion valve, and an exhaust heat controller for controlling the exhaust heat from the engine based on the pressure by, for example, changing the heat efficiency of the engine, e.g., by controlling at least one of (a) the ignition timing of the engine, (b) the opening and closing timing of an intake port valve and an exhaust port valve, and (c) the opening of a fuel gas-controlling valve, so as to efficiently increase heating power during heating operation at low temperatures, without increasing engine noise or shortening the life of the engine.

REFERENCES:
patent: 4735061 (1988-04-01), Hsieh
patent: 4932220 (1990-06-01), Inoue
patent: 5333468 (1994-08-01), Rice
patent: 5363673 (1994-11-01), Atterbury et al.
patent: 5457965 (1995-10-01), Blair et al.

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