Summary
A test rig of the R134a/CO2 cascade supermarket refrigeration system has been built up to get a comprehensive understanding of its performance. The results show that the maximum COP of the system occurred when the condensing temperature of the CO2 cycle was about -2°C, the condensing temperature of R134a and the evaporating temperature of CO2 was settled at 48°C and -30°C respectively with a temperature difference of 3°C. Moreover, the COP remained stable while the condensing temperature varied within a certain range of ±5°C. Results also show that the maximum deviation of the compressor adiabatic efficiency is within 4%, the main factor affecting the system cooling capacity is the compressor volumetric efficiency. And the performance of the cascade system could be 3% higher compared with that of conventional R404a refrigeration system at the same condition.
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Details
- Original title: [In Chinese. / En chinois.]
- Record ID : 30010244
- Languages: Chinese
- Source: Journal of Refrigeration - vol. 34 - n. 152
- Publication date: 2013/08
- DOI: http://dx.doi.org/10.3969/j.issn.0253-4339.2013.04.059
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Indexing
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Themes:
Compression systems;
HFCs;
CO2;
Supermarkets, display cabinets - Keywords: Refrigerating system; R134a; R744; Supermarket; Performance; Cascade system; Expérimentation; CO2
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