Refrigeration cycle device

摘要

In order to provide a refrigeration cycle device that is compact and efficiently utilizing an expansion machine and reduced in manufacturing cost through the use of a first compressor and second compressor driven by an expansion machine, a heat radiator and an on-off valve are disposed between the first and the second compressors and the second heat radiator is utilized irrespective of the operating mode such as the cooling or heating operation. Also, the heat transfer area ratio, which is a ratio of the heat transfer area of the second heat source side heat exchanger relative to the total heat transfer area of the heat transfer areas of said first and second heat source side heat exchangers, is set, according to the air speed distribution, within a range at which the COP is at its peak. Thus, the second heat source side heat exchanger can be utilized even during the heating operation, providing a high efficiency refrigeration cycle device.

主权项

1. A refrigeration cycle device comprising a first compressor, a second compressor driven by recovered power recovered by an expansion machine, refrigerant flow path changeover means, a load side heat exchanger, a first heat source side heat exchanger and a second heat source side heat exchanger, and changeable between a cooling operation and a heating operation by said refrigerant flow path change-over means;
wherein said second compressor and said first compressor are connected in series; said second heat source side heat exchanger is disposed between said first compressor and said second compressor during the cooling operation, and wherein the operation is performed by the utilization of said first heat source side heat exchanger and said second heat source side heat exchanger irrespective of operation mode, wherein an inlet portion of the first heat source side heat exchanger and an inlet portion of the second heat source side heat exchanger are connected therebetween by a first pipe having only a first check valve during the heating operation and an outlet portion of the first heat source side heat exchanger and an outlet portion of the second heat source side heat exchanger are connected therebetween by a second pipe having only a second check valve during the heating operation, wherein the first and the second check valves and the refrigerant flow path changeover means are arranged so that the first heat source side heat exchanger and the second heat source side heat exchanger are connected in series during the cooling operation and the first heat source side heat exchanger and the second heat source side heat exchanger are connected in parallel during the heating operation, and during the cooling operation, the outlet of the first compressor is connected to the inlet of the second heat source side heat exchanger, the outlet of the second heat source side heat exchanger is connected to the inlet of the second compressor, and the outlet of the second compressor is connected to the inlet of the first heat source side heat exchanger, and wherein an efficiency of heat exchange of the first heat source side heat exchanger or the second heat source side heat exchanger is controlled in response to at least one of an outdoor air temperature, an air conditioner load and an indoor air temperature.