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Performance optimisation of an ultra-low temperature freezing using ejectors and a mixture of R600a and R1150 for a medical application.

Number: 1129

Author(s) : EXPÓSITO CARRILLO J. A., SÁNCHEZ DE LA FLOR F. J., SALMERÓN LISSEN J. M., RODRIGUEZ JARA E. A. , RUIZ PARDO A.

Summary

Ultra-Low Temperature applications, in the range -50 ºC to -100 ºC, cannot be economically achieved with single stage refrigeration cycles because of the high pressure ratio required. This problem might be solved by using different strategies like cascade or double stage circuits. However, these solutions are usually too complex for the capacities required in medical applications. Thus, an ejector based auto-cascade cycle is proposed to increase the Coefficient of Performance of the cooling cycle. In addition, as an alternative to the very high GWP refrigerants used for ultra-low temperature applications, a mixture of the hydrocarbons iso-butane and ethylene has been used. The results reported the optimum composition of the refrigerant mixture and a potential improvement of 25% on the COP due to the use of the ejector. It can be concluded that ejectors can be implemented in this type cycles without adding excessive complexity and cost.

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Performance optimisation of an Ultra-Low Temperature freezing using ejectors and a mixture of R600a and R1150 for a medical application

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Details

  • Original title: Performance optimisation of an ultra-low temperature freezing using ejectors and a mixture of R600a and R1150 for a medical application.
  • Record ID : 30027957
  • Languages: English
  • Subject: Technology
  • Source: 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2020). Proceedings. Kyoto, Japon, December 7-9th 2020.
  • Publication date: 2020/12/07
  • DOI: http://dx.doi.org/10.18462/iir.gl.2020.1129

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