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The optimum high pressure for CO2 transcritical refrigeration systems with internal heat exchangers.

Author(s) : CHEN Y., GU J.

Type of article: Article, IJR article

Summary

The system performance of a CO2 refrigeration system is greatly affected by the compressor discharge pressure. An internal heat exchanger (IHX) with high effectiveness is an important factor to achieve high system performance. The expression traditionally used to describe the heat exchange effectiveness is not suitable for CO2 systems. As a result, a practical effectiveness expression for IHX, based on enthalpy difference, has been derived and is reported. Detailed analysis on the relationship between the optimum high pressure and other systematic parameters was performed. Evaporating temperature has little influence on the optimum high pressure and IHX can minimize the sensitivity of the system to the refrigerant quality at the evaporator outlet. Based on simulation data, a correlation of the optimum high pressure was developed that predicts the simulation values with a deviation of less than 3.6% in the whole range and 0.94% when the evaporating temperature= 5.3 °C. The results reported in this paper can be used in optimum control and performance evaluation of the whole system.

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Pages: 1238-1249

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Details

  • Original title: The optimum high pressure for CO2 transcritical refrigeration systems with internal heat exchangers.
  • Record ID : 2006-0567
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 8
  • Publication date: 2005/12

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