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Efficiency increase in carbon dioxide refrigeration technology with parallel compression

Author

Listed:
  • H. Fritschi
  • F. Tillenkamp
  • R. Löhrer
  • M. Brügger

Abstract

In this article, we will review the comparison between a CO2 refrigeration system with a parallel compressor and a conventional carbon dioxide refrigeration machine. In order to carry out the comparison, a numerical model has been generated showing a good correlation to experimental data obtained with a fully instrumented test rig machine. We can determine under which conditions an increase in the energy efficiency ratio (EER) of 10% and more can be expected with a parallel compression system. The results will help users to decide upon economically viable refrigeration systems, depending on the operational conditions of the machine. In usual operating conditions, the achievable increase in the EER by the parallel compressor has been determined; furthermore, it showed that a low evaporation temperature and a high temperature at the outlet of the gas cooler have a positive effect on the parallel compression circuit. With respect to the intermediate pressure, an optimum can be specified at low evaporation temperatures.

Suggested Citation

  • H. Fritschi & F. Tillenkamp & R. Löhrer & M. Brügger, 2017. "Efficiency increase in carbon dioxide refrigeration technology with parallel compression," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 12(2), pages 171-180.
    • Handle: RePEc:oup:ijlctc:v:12:y:2017:i:2:p:171-180.
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    File URL: http://hdl.handle.net/10.1093/ijlct/ctw002
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    References listed on IDEAS

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    1. Ge, Y.T. & Tassou, S.A. & Suamir, I.N., 2013. "Prediction and analysis of the seasonal performance of tri-generation and CO2 refrigeration systems in supermarkets," Applied Energy, Elsevier, vol. 112(C), pages 898-906.
    2. I. Colombo & G. G. Maidment & I. Chaer & J. M. Missenden, 2014. "Carbon dioxide refrigeration with heat recovery for supermarkets," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 9(1), pages 38-44.
    3. A. Campbell & G. G. Maidment & J. F. Missenden, 2007. "A refrigeration system for supermarkets using natural refrigerant CO 2," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 2(1), pages 65-79, January.
    4. Alberto Cavallini & Claudio Zilio, 2007. "Carbon dioxide as a natural refrigerant," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 2(3), pages 225-249, July.
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