Fast Simulation of a Vertical U-Tube Ground Heat Exchanger by Using a One-Dimensional Transient Numerical Model |
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| Authors: | H. Su Q. Li X.-H. Li Y. Zhang Y.-T. Kang Z.-H. Si |
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| Affiliation: | 1. School of Energy and Environment, Xihua University , Chengdu, P. R. China cq_suhua@163.com;3. School of Energy and Environment, Xihua University , Chengdu, P. R. China |
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| Abstract: | An explicit one-dimensional transient numerical model has been built for a single-borehole ground heat exchanger, and two computing algorithms are given. The outlet temperature of the U-tube and the soil temperature can be predicted by using arbitrary time-varying load or inlet temperatures as inputs. This numerical model has been compared with analytical models and validated by using test data of three boreholes. Conclusions are that this numerical model is considerably accurate and efficient; the computational time of a one-year-period simulation is about 52 s; recommended is the discrete scheme with 60-s step time and spatial increment of 0.033–0.067 m. |
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