Engine-driven heat pump apparatus and method for stable operatio

Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...

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62184, 623231, 62DIG17, G05D 2300, F25B 2700

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active

057998671

ABSTRACT:
An engine-driven heat pump apparatus having a refrigerant circulation line which includes at least one inside heat-exchanger for exchanging heat between the air in a room and the refrigerant, and a pressure-controlling device for substantially maintaining the pressure on the high pressure side of the refrigerant circulation line by, for example, narrowing the opening of the expansion valve(s), decreasing the volume of air passing through the inside heat-exchanger(s), recirculating the air passing through the inside heat-exchanger(s), lowering the heat efficiency of the engine when the required quantity of radiated heat from the inside heat-exchanger(s) in use is increased, e.g., when the number of inside heat-exchanger(s) in use is increased, thereby maintaining or increasing heating power in the heating mode, irrespective of the number of inside heat-exchangers in use.

REFERENCES:
patent: 3421339 (1969-01-01), Volk et al.
patent: 4697434 (1987-10-01), Yuyama

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