Finite line-source model for borehole heat exchangers: effect of vertical temperature variations |
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| Authors: | Tatyana V. Bandos,Á lvaro Montero,Esther Ferná ndez,Juan Luis G. Santander,José Marí a Isidro,Jezabel Pé rez,Pedro J. Ferná ndez de Có rdoba,Javier F. Urchueguí a |
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| Affiliation: | 1. Instituto Universitario de Matemática Pura y Aplicada, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain;2. Instituto de Ingeniería Energética, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain |
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| Abstract: | A solution to the three-dimensional finite line-source (FLS) model for borehole heat exchangers (BHEs) that takes into account the prevailing geothermal gradient and allows arbitrary ground surface temperature changes is presented. Analytical expressions for the average ground temperature are derived by integrating the exact solution over the line-source depth. A self-consistent procedure to evaluate the in situ thermal response test (TRT) data is outlined. The effective thermal conductivity and the effective borehole thermal resistance can be determined by fitting the TRT data to the time-series expansion obtained for the average temperature. |
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| Keywords: | Geothermal Borehole heat exchangers Heat transfer Thermal response test Ground-coupled heat pumps |
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