| 摘要 |
A heat pump type chiller (100) equipped with a compressor (10), a refrigerant-air heat exchanger (20), an expansion valve (40), and a refrigerant-circulating-liquid heat exchanger (50), wherein a circulating liquid is cooled by means of a heat exchange between a refrigerant and the circulating liquid. A circulating liquid inlet part, a circulating liquid outlet part, and a surface part of the refrigerant-circulating-liquid heat exchanger (50) are provided respectively with temperature sensors (TWR, TWL, TWS), and a refrigerant suction passage of the compressor (10) is provided with a pressure sensor (PL). When it is detected that the temperature detected by the three temperature sensors (TWR, TWL, TWS) or a refrigerant evaporation temperature calculated by converting from the pressure detected by the pressure sensor (PL) is equal to or less than a prescribed temperature, the compressor (10) is stopped and a circulation pump (300) for circulating the circulating liquid is operated. |
