Patent ID: 7481067
Filing Date: 2009-01-27
Classification: F25B

Abstract:
1. A refrigerating apparatus comprising: a supercritical freezing cycle having a compressor for compressing a refrigerant to a pressure higher than a critical pressure, a gas cooler, a decompressing mechanism and an evaporator, and using as the refrigerant a natural system refrigerant; a receiver provided to a high-pressure side of the supercritical freezing cycle; a receiver temperature detector for detecting a temperature of the receiver; a bypass circuit for connecting an intermediate portion in the high-pressure side of the supercritical freezing cycle and a downstream portion located at a downstream side of the intermediate portion, wherein the receiver is provided to the bypass circuit, an adjusting valve provided in between the receiver and the downstream portion in the bypass circuit for adjusting an amount of the refrigerant flowing through an inside of the receiver, and a controller for controlling a density of a circulated liquid refrigerant flowing through the inside of the receiver by bringing the temperature of the receiver detected by the receiver temperature detector close to a target receiver temperature, wherein the target receiver temperature is determined based on data obtained by a preliminary test.