| 摘要 |
PROBLEM TO BE SOLVED: To improve performance and efficiency of a refrigeration cycle to be used for cooling such as cooling, refrigerating, and freezing a supercritical refrigeration cycle by increasing the specific enthalpy difference of a refrigerant in a vaporizer, in a refrigeration cycle device which uses gas, such as carbon dioxide, as a refrigerant.SOLUTION: A two-stage compression and two-stage expansion supercritical refrigeration cycle device cools a main flow 11 and heats a branch flow 12 by a heat exchanger 3 between a radiator 1 and a high stage-side expansion valve 2. A branch flow 12' which is in a heated gas phase and refrigerant vapor self-vaporized in a gas-liquid separator 5 after being reduced in pressure by the high stage-side expansion valve 2 are sucked by an ejector 6 to be raised in pressure up to intermediate pressure. The refrigerant pressure in the gas-liquid separator 5 is made lower than the intermediate pressure to decrease the specific enthalpy of a refrigerant flowing in the vaporizer 1 down to saturated liquid enthalpy under pressure lower than the intermediate pressure. |
