Refrigeration apparatus

Details Refrigeration apparatus Refrigeration apparatus

2003-12-25

2008-10-14

Norman, Marc E (Department: 3744)

Refrigeration

Automatic control

Air compessor, cooler and expander

C062S175000, C062S197000, C062S228500, C062S500000, C062S510000

Reexamination Certificate

active

07434414

ABSTRACT:
A refrigerant circuit (10) of a refrigeration apparatus is filled up with carbon dioxide as a refrigerant. In the refrigerant circuit (10), a first compressor (21) and a second compressor (22) are arranged in parallel. The first compressor (21) is connected to both an expander (23) and a first electric motor (31), and is driven by both of the expander (23) and the first electric motor (31). On the other hand, the second compressor (22) is connected only to a second electric motor (32), and is driven by the second electric motor (32). In addition, the refrigerant circuit (10) is provided with a bypass line (40) which bypasses the expander (23). The bypass line (40) is provided with a bypass valve (41). And, the capacity of the second compressor (22) and the valve opening of the bypass valve (41) are regulated so that the COP of the refrigeration apparatus is improved after enabling the refrigeration apparatus to operate properly in any operation conditions.

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“Theoretical Performance of Carbon Dioxide Cycle With Incorporation of Compressor/Expander Integrated Type Fluid Machinery,” Fukuda Mitsuhiro, 35th Air Conditioning and Refrigeration Combined Lecture Meeting, Lecture Collected Papers, pp. 57-60.
Heyl et al., Expander-Compressor for a more Efficient use of CO2 as Refrigerant, pp. 240-248.
Ma et al. Thermodynamic Analysis and Comparasion of Expander for SO2 Transcritical Cycle, pp. 287-292.

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