| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerant cooling circuit capable of optimally maintaining freezing efficiency based upon the pressure. SOLUTION: A pressure of a high pressure side of a refrigerant circulation path is varied by controlling opening adjustment of a solenoid expansion valve 3, varying of a rotational frequency of a fan 21 in a gas cooler, varying of a rotational frequency of a fan 41 in an evaporator, varying of compression capacities of compressors 1 (1a and 1b), or opening and closing of solenoid valves 12a, 12b and 12c by a pressure control part 100 in response to a pressure detected by a pressure detecting means 16. COPYRIGHT: (C)2006,JPO&NCIPI
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