| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dual refrigeration system, having two refrigerant circuits coupled, which can suppress a rise in pressure accompanying a temperature rise of a liquid receiver and also improve reliability.SOLUTION: A dual refrigeration system includes a high temperature refrigeration cycle 20 in which a high temperature-side compressor 21, a high temperature-side condenser 22, a high temperature-side expansion valve 23, a high temperature-side evaporator 24, and a high temperature-side heat accumulating evaporator 25 are connected by piping and a refrigerant is circulated, a low temperature refrigeration cycle 10 in which a low temperature-side compressor 11, a low temperature-side condenser 12, a low temperature-side liquid receiver 13, a low temperature-side expansion valve 15, and a low temperature-side evaporator 16 are connected by piping and a refrigerant is circulated, a cascade condenser 30 exchanging heat between the refrigerant flowing in the high temperature-side evaporator 24 and the refrigerant flowing in the low temperature-side condenser 12, and a heat accumulating tank 31 which houses the high temperature-side heat accumulating evaporator 25 and low temperature-side liquid receiver 13, accumulates cold heat by cooling a heat accumulating medium 32 by the high temperature-side heat accumulating evaporator 25, and also cools the low temperature-side liquid receiver 13 with the cold heat accumulated in the heat accumulating medium 32. |
