To provide a refrigerating system for easily and effectively determining run out of gas and overcharge during operation.
In this heat pump device, a heat source side unit 1 having a compressor 2, an evaporator 3 and an electric operated expansion valve 5 and a hot water supply unit 10 having a gas cooler 11 are connected to each other via a unit-to-unit pipe 17, and the refrigerating cycle is filled with refrigerant which is at supercritical pressure on the high pressure side during operation. The heat pump device comprises a temperature measuring means 20 for measuring the temperature of the refrigerant on the high pressure side, a control means 23 for controlling the valve opening of the electric operated expansion valve 5 so that pressure on the high pressure side during operation corresponds to target pressure on the high pressure side, set in accordance with the outlet temperature and outlet pressure of the evaporator 3 and parameters of a water supply temperature, and a determining means 23 for determining that the refrigerant runs out of gas when the valve opening of the electric operated expansion valve 5 is restricted by the control means 23 and the temperature on the high pressure side measured by the temperature measuring means 20 rises over a preset temperature.
TAKIZAWA SADAHIRO
OTAKE MASAHISA
SANYO COMMERCIAL SERVICE CO
Kushibuchi Kazue
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