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The potential of multi-phase rotary pressure exchanger integration for large-scale transcritical CO2 heat pumps.

Number: 0965

Author(s) : COUTTO C., HAFNER A., THATTE A., KLEYNHANS G.

Summary

Transcritical CO2 heat pumps are a promising renewable solution to provide medium and high temperature heat, such as for the supply of district heating networks (DHN). High expansion and compression energy losses are associated with such systems due to the combined effect of large temperature lift and CO2’s high operating pressures. To reduce these losses and improve the system efficiency, several technologies that recover the expansion work, mainly turbines and ejectors, have been applied to replace throttling valves. Multi-phase rotary pressure exchangers (PXG) which are often used in seawater reverse-osmosis desalination plants have started to penetrate the refrigeration market but have not been tested yet for large-scale CO2 heat pump applications. This study proposes to assess the potential of integrating PXG to large-scale transcritical CO2 heat pump systems and to compare its increased efficiency with that of other technologies. Several new heat pump system architectures integrating the PXG were created and analysed in typical conditions for a very large capacity water-to-water heat pump with a turbo-compressor. The analyses show that PXG offers significant performance improvement, up to 10% COP increase, that is larger than that of existing state-of-the art expanders which makes it a relevant option to consider in future systems.

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Pages: 10

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Details

  • Original title: The potential of multi-phase rotary pressure exchanger integration for large-scale transcritical CO2 heat pumps.
  • Record ID : 30033318
  • Languages: English
  • Source: 11th IIR Conference on Compressors and Refrigerants.
  • Publication date: 2024/09
  • DOI: http://dx.doi.org/10.18462/iir.compr.2024.0965

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