The present invention improves the efficiency of a refrigeration system by accurately ascertaining the amount of heat currently in a load-side apparatus. The present invention comprises: a heat pump chiller 1 that includes a water-refrigerant heat exchanger 12 in which heat is exchanged between a refrigerant and a heat medium, and a compressor 11; a load-side apparatus 2; a water circuit 4 in which the water-refrigerant heat exchanger and the load-side apparatus are connected to each other by a pipe and water is caused to circulate by a pump 3 so as to convey the amount of heat supplied by the heat pump chiller to the load-side apparatus; temperature sensors 23a, 23b that detect the temperature of water; pressure sensors 24a, 24b that detect the pressure of water; a suction temperature sensor 25 that detects a load indicator for determining the load in the load-side apparatus; and a control device 30 that controls the respective operations of the compressor and the pump on the basis of values obtained respectively from the temperature sensors, the pressure sensors and the suction temperature sensor.
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