| 摘要 |
PURPOSE: To utilize the waste heat of a compressor during heating operation for defrosting and to improve reliability the energy efficiency of a compressor by a method wherein a heat storage layer is formed at a bypass circuit bypassing a part of a line to interconnect a pressure reducer and an outdoor heat-exchanger and disposed on the outer periphery of a heat storage tank compressor. CONSTITUTION: A bypass circuit 14 bypasses a line to interconnect a motor-operated expansion valve 4a and an outdoor heat-exchanger 5. A three-way valve 15 to switch a refrigerant flow passage is located at a branch part between the line and the bypass circuit 14. The bypass circuit 14 is provided with a check valve 16 and a heat- exchanger 17. A heat storage tank 18 is filled with a latent heat storage material 19, the heat-exchanger 17 is disposed to effect heat-exchange with the heat storage material 19 and further, the heat storage tank 18 is disposed to effect heat-exchange with a compressor 1. During heating operation, the waste heat of the compressor 1 is recovered and stored in the heat storage tank 18 and the heat is utilized for defrost. Further, during defrost operation, a refrigerant flows to the bypass circuit 14 and through heat-exchange with the latent heat storage material 19 in the heat storage tank 18, defrost operation is carried out with high heating capacity kept, and the degree of drying of a compressor suction refrigerant is kept at a high value. |
