Refrigeration – Processes – Compressing – condensing and evaporating
Reexamination Certificate
2008-04-17
2010-10-26
Ali, Mohammad M (Department: 3744)
Refrigeration
Processes
Compressing, condensing and evaporating
C062S510000
Reexamination Certificate
active
07818971
ABSTRACT:
A CO2cooling and heating apparatus and method permit simultaneous production of high-temperature heat source and low-temperature heat source having a temperature difference therebetween. The apparatus/method uses CO2(carbon dioxide) as a refrigerant, and has a first refrigerating cycle circuit where the refrigerant is compressed to a supercritical zone and then decompressed via an expansion device to a pressure/temperature level of the CO2triple point or below to thereby attain evaporation. The apparatus can include multistage compressors, intermediate cooler disposed in a first refrigerant flow path between a condenser and the expansion device. A second refrigerating cycle circuit having a second refrigerant flow path, which can branch off from the first refrigerant flow path or provided in an independent closed circuit, can be provided to carry out absorption of evaporation latent heat with the first refrigerant flow path to thereby maintain the pressure/temperature level of the CO2triple point (Ptr) or above. A third refrigerating cycle circuit having a third refrigerant flow path also can be provided to carry out heat exchange with the second refrigerant flow path.
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Search report issued in corresponding application No. PCT/JP2006/320566, dated Jan. 30, 2007.
Fujima Katsumi
Mugabi Nelson
Yamaguchi Hiroshi
Yoshikawa Choiku
Ali Mohammad M
Mayekawa Mfg. Co., Ltd.
Rossi Kimms & McDowell LLP
The Doshisha
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