Journal
JOURNAL OF BUILDING PERFORMANCE SIMULATION
Volume 11, Issue 6, Pages 655-668Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19401493.2017.1423390
Keywords
geothermal boreholes; ground heat exchangers; g-functions; thermal response factors; finite line source
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Funding
- Fonds de Recherche du Quebec - Nature et Technologies [2015-B3-181989]
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Numerical methods are proposed for the efficient evaluation of the g-functions of geothermal bore fields using the finite line source solution. The presented methods reduce the calculation time for the calculation of g-functions by reducing the number of numerical evaluations of the analytical finite line source solution. A similarity identification method is presented to identify pairs of boreholes for which the finite line source solution takes the same value. A load history reconstruction method is presented to evaluate the g-function at non-uniform time-steps. Using the proposed numerical methods, the calculation time for the g-function of a rectangular field of 12x12 boreholes is reduced by a factor 308. The numerical methods allow the evaluation of g-functions of bore fields with large amounts of boreholes in irregular configurations. The g-function of a field of 512 randomly positioned boreholes is calculated in 27 minutes.
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