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Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

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  • Javed, Saqib
  • Spitler, Jeffrey

Abstract

The borehole thermal resistance – that is, the thermal resistance between the fluid in the U-tube and the borehole wall – is both a key performance characteristic of a closed-loop borehole ground heat exchanger and an important design parameter. Lower borehole thermal resistance leads to better system performance and/or lower total borehole length and possibly lower installation costs. Borehole thermal resistance may be determined using in situ thermal response testing, but for design purposes, it is important to be able to predict the borehole thermal resistance prior to installation. Due to the complexity of calculating it, numerous simplified methods have been proposed. This paper reviews published methods for calculating borehole thermal resistance for grouted boreholes with single U-tubes and compares their results against a rigorous analytical method.

Suggested Citation

  • Javed, Saqib & Spitler, Jeffrey, 2017. "Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers," Applied Energy, Elsevier, vol. 187(C), pages 790-806.
    • Handle: RePEc:eee:appene:v:187:y:2017:i:c:p:790-806
    DOI: 10.1016/j.apenergy.2016.11.079
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    References listed on IDEAS

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