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Performance analysis and comprehensive comparison between CO₂ and CO₂/ethane azeotropy mixture as a refrigerant used in single-stage and two-stage vapor compression transcritical cycles.

Author(s) : WANG D., CHEN Z., GU Z., LIU Y., KOU Z., TAO L.

Type of article: IJR article

Summary

In this study, the performance of a two-stage compression transcritical cycle with an expander (TCE) and a conventional single-stage compression transcritical cycle with a throttling valve (SCT) using pure CO₂ and CO₂/ethane (0.78/0.22, mass fraction) azeotropy mixture as a refrigerant in an air-source heat pump water heater (ASHPWH) system is investigated. From the point of the first and second laws of thermodynamics, the theoretical analysis of cycle characteristics based on the two systems with both refrigerants are carried out and compared in detail. The results show that the COP of TCE cycle with CO₂ and CO₂/ ethane are at least 57.4% and 81.6% higher than those of the SCT cycle under the studied conditions. The main attractiveness of the CO₂/ethane azeotropy refrigerant is connected with its lower discharge temperature compared with the pure CO₂, which can prolong the compressor lifetime. In addition, the CO₂/ethane azeotropy refrigerant can obviously reduce the evaporation temperature, which is conducive to the ASHPWH system in cold region.

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Pages: 39-47

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Details

Original title: Performance analysis and comprehensive comparison between CO₂ and CO₂/ethane azeotropy mixture as a refrigerant used in single-stage and two-stage vapor compression transcritical cycles.
Record ID : 30027465
Languages: English
Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 115
Publication date: 2020/07
DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.03.003

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Indexing

Themes: CO2;
Hydrocarbons;
Compression systems
Keywords: Compression system; CO2; R744; Ethane; R170; Azeotropic mixture; Two-stage system; Modelling; Performance