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Investigation of R744 AC and heat pump systems for electric vehicles with ejectors.

Number: 0656

Author(s) : NIROOMAND R., PIESCH N., HAFNER A., BANASIAK K., AYAD F.

Summary

R744 is considered a highly promising alternative to PFAS-based refrigerants in electric vehicle air conditioning/heat pump systems. However, the throttling loss in an AC/HP cycle using R744 is relatively higher than in a cycle using PFAS producing refrigerants. It is possible to address this challenge by using a two-phase ejector that uses the expansion work of the high-pressure refrigerant to boost and compress the low-pressure refrigerant. In this article, a thermodynamic analysis is carried out to investigate the advantages of integrating a two-phase ejector into the electric vehicle AC/HP cycle. In this study, three cabin cooling modes, two cabin heating modes, and one battery cooling mode are investigated. The results show that the ejector provides up to 10.5 bar pressure lift and 26% compressor power saving potential. Furthermore, the required compressor displacement is reduced by about 22%. With the same compressor for baseline and ejector systems, the ejector system provides 24% more cooling capacity.

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Pages: 9 p.

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Details

  • Original title: Investigation of R744 AC and heat pump systems for electric vehicles with ejectors.
  • Record ID : 30033402
  • Languages: English
  • Subject: Technology
  • Source: 11th IIR Conference on Compressors and Refrigerants.
  • Publication date: 2024/09
  • DOI: http://dx.doi.org/10.18462/iir.compr.2024.0656

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