Effective pipe-to-borehole thermal resistance for vertical ground heat exchangers |
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Authors: | Mostafa H. Sharqawy Esmail M. Mokheimer Hassan M. Badr |
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Affiliation: | 1. Mechanical Engineering Department, Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, MA 02139, USA;2. Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia |
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Abstract: | The effective pipe-to-borehole thermal resistance of a vertical ground heat exchanger is investigated numerically. An analysis is carried out to determine the dimensionless geometrical parameters affecting such resistance. The heat transfer rates between the U-shaped pipes and the borehole are determined numerically and compared with some well-known limiting analytical solutions. A best-fit correlation for the effective pipe-to-borehole thermal resistance is presented in dimensionless form. The results are compared against approximate analytical solutions that represent the U-shaped pipes as a single pipe of equivalent diameter and against experimental data available in the literature. It is found that the available models do not accurately represent the effective pipe-to-borehole thermal resistance. |
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Keywords: | Geothermal Borehole Thermal resistance Ground heat exchanger Ground coupled heat pump |
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