| 摘要 |
PROBLEM TO BE SOLVED: To suppress energy consumption used to heat a sucked refrigerant and to improve cooling capabilty by providing a heat exchanger for heat exchanging a suction tube for connecting an evaporator to a compressor in a refrigerating circuit, and a heating means for further heating the refrigerant passed through the exchanger. SOLUTION: A refrigerant evaporated and vaporized by an evaporator 4 is sucked to a compressor 1 through a suction refrigerant tube 5. At a front stage sucked to the compressor 1, the refrigerant is first heat exchanged with a capillary tube 3 to be heated in a heat exchanger 8, then again heated by an electric heater 8 wound on a suction refrigerant tube 5 of a heater, and then sucked to the compressor 1. According to the heating of the refrigerant at the suction side of the compressor 1 in this manner, the refrigerant can be cooled by the tube 3 on one hand to improve its cooling capability, and in the case of heating the refrigerant by the heater 9, power consumption of the heater 9 can be suppressed as much as possible, thereby saving the power.
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