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Conceptual investigation on the ejector benefits in R744 air conditioning heat pump systems for electric vehicles.

Number: 1165

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

Summary

R744 is one of the most promising alternatives for per- and polyfluoroalkyl substances producing refrigerants in air conditioning/heat pump systems of electric vehicles. However, there is a high exergy destruction with the high-pressure expansion valve in the R744 AC/HP cycle. A two-phase ejector can be used to recover a part of the expansion work from the high-pressure stream to boost and compress the low-pressure refrigerant. The compressor is thereby unloaded. This article uses a thermodynamic analysis to investigate the benefits of using a two-phase ejector in the R744 AC/HP cycle. Three cabin cooling modes, two cabin heating modes, and one fast charging mode have been investigated. The results show that the power demand can decrease by up to 21% depending on the ejector efficiency to provide the same thermal capacities. In addition, the ejector can decrease the discharge temperature by up to 12 K in heating mode.

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Pages: 10 p.

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Details

  • Original title: Conceptual investigation on the ejector benefits in R744 air conditioning heat pump systems for electric vehicles.
  • Record ID : 30032686
  • Languages: English
  • Source: 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Publication date: 2024/08
  • DOI: http://dx.doi.org/10.18462/iir.gl2024.1165

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