| 摘要 |
A refrigerating system comprises a compressor (1A, 1B, 1C), a heat rejection device (2), an expansion device (15), an evaporator (5A, 5B, 5C) and a receiver (4), capable of operating with the compressor discharge higher than the critical pressure of the refrigerant; where the flow outlet from the heat rejection device is regulated by a pressure control valve (7), the pressure downstream of the pressure control valve is regulated by a gas vent valve (8), the refrigerant flow to the evaporator is further regulated by an automatic control device (41, 52, 14) at the inlet to the evaporator, and the automatic control device being set to permit intermittent flow of liquid refrigerant to the receiver during normal operation of the system. The refrigerant may be carbon dioxide, which may operate under transcritical pressures e.g. 80 to 120 bar absolute. The receiver acts as a trap for any liquid from the evaporator and ensures that the gas flow to the compressor suction is dry.
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