METHOD AND APPARATUS FOR OPERATION CONTROL OF SUPERCRITICAL VAPOR COMPRESSION CYCLE, AND CAPACITY CONTROL APPARATUS AND CAPACITY CONTROL VALVE OF VARIABLE DISPLACEMENT COMPRESSOR

摘要

PROBLEM TO BE SOLVED: To ensure optimum operation over a wide range by keeping the refrigerant pressure on the high pressure side of a supercritical vapor compression cycle using a carbon dioxide gas refrigerant, etc., at a pressure not exceeding an optimum density line.;SOLUTION: In the operation control method for a supercritical vapor compression cycle where a refrigerant is circulated through a compressor 1, a radiator 2, an expansion valve 4, and an evaporator 5 in order and which is operated in a supercritical region, a variable displacement compressor is used as the compressor 1, and the refrigerant pressure and refrigerant pressure on an outlet side of the compressor 1 are detected, and capacity of the variable displacement compressor is controlled with a capacity control valve 3 in response to refrigerant temperature.;COPYRIGHT: (C)2000,JPO