| 摘要 |
A heat pump cycle system is provided to prevent freezing of a compressor, to delay frost timing, and to increase heating capacity by including a solenoid valve in a dual heat exchange device of a conventional heat pump cycle system, installing a temperature sensor in a suction pipe of a compressor and properly controlling temperature of refrigerant flowed into the compressor during winter needing heating operation. A heat pump cycle system comprises an indoor expansion valve(6), a dual heat exchange device(8), a first solenoid valve(13), a second solenoid valve(14) and a suction temperature sensor(Ss). The first solenoid valve is connected to a front end of the dual heat exchange device between the indoor expansion valve and the dual heat exchange device. The second solenoid valve is connected to the first solenoid valve in parallel by being bypassed in the dual heat exchange device. The suction temperature sensor is installed in a suction pipe of a compressor(1). Refrigerant is returned to the compressor after heat exchange is performed between refrigerants through the dual heat exchange device by closing the second solenoid valve and opening the first solenoid valve, when temperature sensed in the suction temperature sensor is lower than standard temperature.
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