METHOD FOR DETERMINING PRESSURE OF HIGH PRESSURE COOLING MEDIUM IN REFRIGERATING CYCLE DEVICE

Japanese Patent JP3897681

B2

PROBLEM TO BE SOLVED: To avoid limitation of a constant density ratio to the utmost, and obtain high power recovering effect in a wide operation range by using an expander in accordance with a flow direction of cooling medium.
SOLUTION: In this method for determining pressure of high pressure cooling medium in a refrigerating cycle, the refrigerating cycle uses carbon dioxide for cooling medium, and it is provided with a compressor, an outdoor side heat exchanger, the expander, and an indoor side heat exchanger. It is also provided with a bypass circuit provided in parallel to the expander, and a control valve to adjust flow of cooling medium in the bypass circuit. The compressor is driven by power recovered by the expander. With the optimum high pressure Ph for a refrigerating freezing cycle flowing in the expander and a second refrigerating cycle flowing in the bypass circuit, bypass quantity ratio RbO flowing in the bypass circuit at Ph, the maximum refrigerating cycle efficiency COPe for the first refrigerating cycle at Ph, and the maximum refrigerating cycle efficiency COPb for the second refrigerating cycle at Ph, then the optimum high pressure Ph to maximize (1-RbO)×COPe+RbO×COPb is determined.

Kazuo Nakatani
Yoshikazu Kawabe
Noriho Okaza
Yuji Inoue
Akira Tsuda

JP2002318131A

March 28, 2007

October 31, 2002

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Matsushita Electric Industrial Co., Ltd

F25B1/00; F25B9/00; F25B9/06; F25B11/02; F25B13/00; F25B40/00; (IPC1-7): F25B1/00; F25B11/02

JP8093633A
JP2000234814A
JP2000329416A

Yoshihiro Shimizu
Shinichi Abe
Yuji Tsujida

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