Patent ID: 8151584

Claim:
A refrigeration system, including: a refrigerant circuit in which a compressor and a cooling heat exchanger for cooling the interior of a cold storage are connected, the refrigeration system operating in a refrigeration cycle by circulating refrigerant through the refrigerant circuit; and a capacity regulator for regulating the cooling capacity of the cooling heat exchanger to bring the internal cold storage temperature to a desired temperature, wherein the capacity regulator is configured to perform energy saving operation including: operating the refrigeration system in a first mode in which the compressor is driven while the cooling capacity of the cooling heat exchanger is regulated by the capacity regulator, operating the refrigeration system in a second mode in which when the internal cold storage temperature is held at the desired temperature during the first mode, the cooling capacity of the cooling heat exchanger is increased by the capacity regulator to lower the internal cold storage temperature to a lower limit of a desired temperature range containing the desired temperature and the compressor is then stopped and operating the refrigeration system in a third mode in which the compressor remains stopped, and when the internal cold storage temperature reaches an upper limit of the desired temperature range after the stop of the compressor by the second mode, the compressor is activated to restart the first mode.