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Study on the freezing characteristics of soil surrounding the ground heat exchanger of ground coupled heat pump.

Author(s) : YANG W., SHI M., CHEN Z.

Summary

The study on freezing characteristics of soil surrounding the GHE of GCHP (ground coupled heat pump) is performed based on the apparent heat capacity method. The influences of the soil water content, initial temperature, thermal diffusivity and Stefan number on soil temperature distribution and freezing velocity are discussed, the results indicate that the computed soil temperature, compared with unfreezing, is higher and thus the heat transfer resistance is smaller. This contributes to the decrease of GHE design length and system initial cost. It also proves that the increase of water content in soil is favourable to the design and operation of GCHP. Moreover, the increase of soil thermal diffusivity and the decrease of Stefan number can stay effectively the freezing velocity. These results may provide a preference for the application of GCHP in northern districts.

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Pages: ICR07-E2-712

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Details

  • Original title: Study on the freezing characteristics of soil surrounding the ground heat exchanger of ground coupled heat pump.
  • Record ID : 2008-0875
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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