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- W2008553541 abstract "Abstract A composite-medium line-source model has been recently developed for modeling short-time thermal processes of borehole ground heat exchangers. The composite-medium line-source model is attractive for applications where the short-term or high-frequency responses of borehole ground heat exchangers are important. In this paper, the short-time performance of this analytical model is examined in depth by comparing it with a two-dimensional finite volume model. The numerical model can address the heat capacity of circulating water by using a novel time-varying boundary condition on the inner walls of the U-shaped tube, in addition to the heat capacities of U-shaped tube and grouting material. Both the numerical and the analytical composite-medium models are validated using an independent sandbox experiment. Comparisons between the two models are also made for different parameters, including heating rate, the spacing of the U-tube legs, thermal properties, and borehole radius. Overall, the composite-medium line-source model gives the virtually same results as the numerical model except for the first several minutes: the analytical solution overestimates temperature responses during the first 3 min, which is caused by the line-source assumption ignoring the heat capacities of the fluid and the U-shaped pipe." @default.
- W2008553541 created "2016-06-24" @default.
- W2008553541 creator A5015892044 @default.
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- W2008553541 date "2014-08-01" @default.
- W2008553541 modified "2023-09-29" @default.
- W2008553541 title "Short-time performance of composite-medium line-source model for predicting responses of ground heat exchangers with single U-shaped tube" @default.
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- W2008553541 doi "https://doi.org/10.1016/j.ijthermalsci.2014.04.002" @default.
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