Supercritical refrigerant cycle system

摘要

Refrigerant cycle system in which a compressor (10), a gas cooler (154), an expansion valve (156) and an evaporator (157) are sequentially connected in a cyclic form and a high pressure side is operated at a supercritical pressure, wherein the degree of opening of the expansion valve (156) is adjusted based on the temperature and pressure of a refrigerant at an outlet of the evaporator (157) so as to control the degree of superheat at the outlet of the evaporator (157). An object is to make large the degree of superheat at the outlet of the evaporator (157) by means of the expansion valve (156).