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A study on CO2 cycle architectures for light commercial refrigeration systems.

Number: pap. S12-P1

Author(s) : MONTAGNER G. P., MELO C.

Summary

In this study, atypical refrigeration cycles were experimentally investigated in an attempt to enhance the thermodynamic performance of CO2-based transcritical refrigeration systems under high ambient temperatures. To this end four cycle architectures were studied, namely: i) capillary tube, ii) thermostatic expansion valve, iii) dual expansion and iv) flash gas removal. It was found that the coefficient of performance values for the first three cycle designs were almost the same in the temperature range studied. It was also observed that the capillary tube cycle design was penalized in terms of cooling capacity due to the resulting evaporator superheating values. Performance improvements of around 20 and 28% in the cooling capacity and coefficient of performance, respectively, were noted when an internal heat exchanger was added to the regular cycle. An innovative cycle design was also explored, showing performance gains of 10 and 15% in the cooling capacity and coefficient of performance, respectively, while maintaining the discharge line temperature below 95°C.

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Pages: 8 p.

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Details

  • Original title: A study on CO2 cycle architectures for light commercial refrigeration systems.
  • Record ID : 30007322
  • Languages: English
  • Source: 2nd IIR International Conference on Sustainability and the Cold Chain. Proceedings: Paris, France, April 2-4, 2013.
  • Publication date: 2013/04/02

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