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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.
Acknowledgments
The authors acknowledge the financial support provided by the Key Program of Sichuan Provincial Education Department (09ZA118) and Xihua University (R0720418). This work has also been supported by the Key Fluid Machinery Laboratory, (Xihua University, SBZD-10). The authors appreciate Mr. Luo Bo from Xihua University, for his suggestions and review of this article.