Patent ID: 6523360
Filing Date: 2003-02-25
Classification: F25B

Abstract:
A cooling cycle with a high-pressure side operating in a supercritical area of a refrigerant, comprising:a compressor that compresses the refrigerant; a gas cooler that cools the compressed refrigerant; a throttling device that throttles flow of the cooled refrigerant; an evaporator that cools intake air by a heat absorbing action of the cooled refrigerant; an internal heat exchanger that carries out heat exchange between the cooled refrigerant and the refrigerant that passed through the evaporator; a temperature sensor that senses a temperature of the cooled refrigerant between the gas cooler and the internal heat exchanger; a pressure sensor that senses a pressure of the cooled refrigerant between the gas cooler and the internal heat exchanger; and a controller that controls at least one of the compressor and the throttling device in accordance with the sensed temperature of the cooled refrigerant and the sensed pressure of the cooled refrigerant, wherein a relationship between the sensed temperature and the sensed pressure satisfies one of at least two control expressions, the at least two control expressions comprising a first control expression giving high priority to a coefficient of performance (COP), and a second control expression giving high priority to a cooling capacity.