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Experimental investigations on a transcritical CO2 refrigeration plant and theoretical comparison with an ejector-based one.
- Source :
- Energy Procedia; Mar2019, Vol. 161, p309-316, 8p
- Publication Year :
- 2019
-
Abstract
- Abstract The paper presents the development of an experimental research facility based on a transcritical single stage vapour compression refrigeration cycle with CO 2 as the working fluid. The experimental setup includes instrumentation and controls which enable tests in a broad range of operating conditions. The measurements presented refer to external temperatures between 21.0°C and 33.5°C; in this latter operating point, energy and exergy analysis allowed the breakdown of irreversibilities. In particular, the gas cooler contributes to the 42.6% of the total exergy losses while the share due to the high-pressure expansion valve is 27.2%. In order to improve the performance of the refrigeration system, a theoretical model was developed including an ejector as the replacement of the expansion valve. The results show that the Coefficient of Performance (COP) is strongly dependent on the entrainment ratio; a value of greater than 0.6 seem to lead to higher COP values, even at low external temperatures. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18766102
- Volume :
- 161
- Database :
- Supplemental Index
- Journal :
- Energy Procedia
- Publication Type :
- Academic Journal
- Accession number :
- 135399287
- Full Text :
- https://doi.org/10.1016/j.egypro.2019.02.097