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Numerical simulation and experimental validation of vapour compression refrigeration systems. Special emphasis on CO2 transcritical cycles.

Author(s) : RIGOLA J., RAUSH G., PÉREZ-SEGARRA C. D., et al.

Type of article: Article, IJR article

Summary

A numerical and experimental comparative study of a carbon dioxide transcritical refrigerating system and a conventional subcritical refrigerating cycle is presented. Attention is focussed not only on the whole refrigeration cycle, but also on the behaviour of the hermetic reciprocating compressors used in these systems. The comparative cases presented have been especially designed for small cooling capacity units with an evaporation temperature around 0 °C. A detailed numerical simulation model for hermetic reciprocating compressors performance, widely validated under conventional fluid refrigerants, has been extended to numerically obtain the CO2 compressor prototypes behaviour. Two CO2 compressor prototypes working with CO2 have been experimentally tested in a specific unit, especially designed and built to analyse high-pressure single stage vapour compression transcritical refrigerating equipments. This set-up has allowed validating a detailed numerical simulation code for thermal and fluid-dynamic behaviours of single-stage vapour compression refrigeration system working with CO2 as refrigerant. The numerical results and experimental data obtained to validate compressors, heat exchangers and whole cycle behaviour have shown a really good agreement. Finally, the numerical and experimental comparison between the carbon dioxide system and the subcritical conventional cycle has shown the possibility of CO2 as fluid refrigerant under the studied working conditions.

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Pages: 1225-1237

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Details

  • Original title: Numerical simulation and experimental validation of vapour compression refrigeration systems. Special emphasis on CO2 transcritical cycles.
  • Record ID : 2006-0689
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 8
  • Publication date: 2005/12

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