IIR document

Thermodynamic analysis of zeotropic mixtures for ejector refrigeration cycle.

Number: 0423



The conventional refrigeration ejector cycle utilises constant temperature process during motive heat consumption needed for vapour generation. This may be thought as the main restriction concerning application of low-grade heat as a motive source by these systems since it results in required significant mass flow rate with small temperature drop of a heating fluid. In contrary, the large change of temperature and small flow rate of the water in order to provide required heat flux is more economically advantageous. In some cases, however, either requirements cannot be fulfilled. The main reason for this limitation is isothermal evaporation of refrigerant in vapour generator. Because of this the refrigerant with temperature glide is highly recommended. One of the possible approaches to reduce this restriction is application of a zeotropic mixture as the working fluid for the conventional ejector cycle. The paper deals with thermodynamic analysis of low GWP refrigerant mixtures applied for ejection cycle. The results show that depending on the type and proportion of mixed refrigerants the temperature of the heating medium change from 5 to 25 K and more. As an effect COP of the system varies between 5 to 35%.

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  • Original title: Thermodynamic analysis of zeotropic mixtures for ejector refrigeration cycle.
  • Record ID : 30028231
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 10th IIR Conference on Compressors and Refrigerants.
  • Publication date: 2021/01/13
  • DOI: http://dx.doi.org/10.18462/iir.compr.2021.0423
  • Document available for consultation in the library of the IIR headquarters only.


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