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In this paper, the heat transfer from a vertical borehole heat exchanger in the presence of groundwater is investigated using a general convection–conduction heat transfer model. The model can be used for estimating the required length of the borehole for a given constant heat load in locations with or without groundwater. All thermal resistances involved in the heat transfer process between the borehole...
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...
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