Temperature control system and its control method

Abstract

The present invention provides a temperature control system that can perform defrosting while minimizing heat loss to the outside air. [Solution] The temperature control system 1 includes a hot water circuit 5 and a chilled water circuit 7 through which a heat transfer medium circulates to exchange heat with a refrigerant in the condenser 11 and evaporator 13. The hot water circuit 5 and chilled water circuit 7 include an indoor heat exchanger 18 that exchanges heat between hot water and indoor air, and an outdoor heat exchanger 22 that exchanges heat between chilled water and outside air. The control unit has a heater mode in which hot water flowing out of the condenser 11 is guided to the indoor heat exchanger 18, and chilled water flowing out of the evaporator 13 is not guided to the outdoor heat exchanger 22, and a defrosting operation mode in which chilled water is guided from the evaporator 13 to the outdoor heat exchanger 22 when frost forms on the outdoor heat exchanger 22 in heat pump mode.

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