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Borehole thermal resistance: laboratory and field studies.

Author(s) : REMUND C. P.

Summary

Vertical ground heat exchangers are a common method of linking geothermal heat pump systems to the earth, and they consist of pipe installed into a borehole that is subsequently backfilled with a material that forms the heat transfer link between the pipe and earth. Until recently, little attention has been given to the thermal properties of commonly used backfill and grouting materials or to the effect of the thermal conductivity of those materials on the thermal performance of the heat exchanger. Laboratory studies were performed. It was found that borehole thermal resistance decreased with increasing grout thermal conductivity, but increasing grout thermal conductivity above 1.0Btu/h.ft.°F provided very small additional reduction. The studies resulted in a set of relationships for borehole thermal resistance.

Details

  • Original title: Borehole thermal resistance: laboratory and field studies.
  • Record ID : 2000-2186
  • Languages: English
  • Source: ASHRAE Transactions. 1999 Winter Meeting, Chicago, Illinois + CD-ROM.
  • Publication date: 1999
  • Document available for consultation in the library of the IIR headquarters only.

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