| 摘要 |
PROBLEM TO BE SOLVED: To provide a cryogenic cooling object fluid by a device easy in maneuvering operation and maintenance by reducing the number of constituting apparatuses by a simple structure, in a refrigerator using a carbon dioxide as a refrigerant in a dual refrigerating cycle device. SOLUTION: This dual refrigerating cycle device has a compressor in which a low-dimensional refrigerant can circulate between a cascade heat exchanger 31 and a condenser 2 and which compresses the carbon dioxide to saturation pressure or supercritical pressure at a temperature of an ordinary temperature level, the condenser for forming a high-pressure carbon dioxide from the compressor as a carbon dioxide liquid or a supercritical carbon dioxide fluid by cooling by the low-dimensional refrigerant circulating between the cascade heat exchanger and the condenser, a CO2 expander 3 for forming a CO2 liquid or a supercritical CO2 fluid from the condenser as solid-gas two-phase CO2 being a mixture of solid CO2 and CO2 gas by reducing pressure to pressure and a temperature level of a triple point or lower of CO2, and a CO2 sublimating means for sending the sublimated CO2 gas to the compressor by supplying cold heat by the sublimation of the solid-gas two-phase CO2 to the cooling object fluid from a cooling load 6. COPYRIGHT: (C)2008,JPO&INPIT
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