An average fluid temperature to estimate borehole thermal resistance of ground heat exchanger

Ciyuan Du and Youming Chen

Renewable Energy, 2011, vol. 36, issue 6, 1880-1885

Abstract: Analysis of borehole thermal resistance is important for the standard sizing of ground heat exchanger (GHE). In this paper, a p-linear dimensionless average fluid temperature is proposed to estimate borehole thermal resistance. A p-linear dimensionless fluid temperature and p-linear dimensionless average fluid temperature are introduced, and the p-linear dimensionless fluid temperature is compared with theoretical dimensionless fluid temperature calculated by quasi-three-dimensional model for both single and double U-tubes. Results show that the p-linear dimensionless temperatures with parameters p→0 and p=−1/2 are respectively in good agreement with the theoretical dimensionless fluid temperatures of single and double U-tubes. Therefore, the dimensionless logarithmic mean temperature for p→0 and the dimensionless geometric mean temperature for p=−1/2 should respectively be adopted to reasonably estimate the thermal resistance of single and double U-tube boreholes.

Keywords: p-Linear parameter; Dimensionless fluid temperature; Average fluid temperature; Quasi-three-dimensional model; Thermal resistance; Borehole (search for similar items in EconPapers)
Date: 2011
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:36:y:2011:i:6:p:1880-1885

DOI: 10.1016/j.renene.2010.10.033

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