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Novel ground heat exchanger configurations for CO2 direct expansion geothermal heat pumps.

Number: 1118

Author(s) : ESLAMI-NEJAD P., BADACHE M., BASTANI A., NGUYEN A.

Summary

This paper evaluates numerically and experimentally the performance of two novel GHE configurations proposed for CO2, based on a multiple mini-channel concept. These configurations are compared against a conventional direct expansion GHE. One configuration is proposed to maximize performance for the same drilling diameter as that of the conventional configuration. However, the other configuration is proposed to minimize the drilling diameter required to deliver the same performance. For this purpose, a fully instrumented transcritial CO2 DX-GSHP has been built at CanmetENERGY in Varennes, Canada. Results have shown that the drilling diameter can be significantly reduced by up to 40% while GHE performance is maintained. Furthermore, under similar drilling diameter, multiple mini-channel concept improves the GHE performance by up to 15% over conventional single U-pipe configuration.

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Novel ground heat exchanger configurations for CO2 direct expansion geothermal heat pumps.

Pages: 6

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Details

  • Original title: Novel ground heat exchanger configurations for CO2 direct expansion geothermal heat pumps.
  • Record ID : 30027963
  • Languages: English
  • Subject: HFCs alternatives
  • 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.2020.1118

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