A computationally efficient numerical model for heat transfer simulation of deep borehole heat exchangers
A computationally efficient numerical model for heat transfer simulation of deep borehole heat exchangers
复制标题
用于深埋管换热器传热模拟的高效计算数值模型
DOI：
10.1016/j.enbuild.2018.02.013
复制
发表时间：
2018-05
影响因子：
6.7
通讯作者：
Fang Zhaohong
中科院分区：
文献类型：
--
作者：
Fang Liang;Diao Nairen;Shao Zhukun;Zhu Ke;Fang Zhaohong
作为一种很有前途的季节性储热技术，深埋管换热器（DBHE）也为土壤耦合热泵系统提供了一种新的变化，特别是在寒冷气候地区的应用。数值模拟是研究深钻孔周围传热问题的有效手段，但其计算量大。本文建立了同轴管DBHE换热器的传热模型，考虑了管内与周围次表面的耦合传热。基于有限差分法开发了DBHE热分析软件包，并采用直接求解所得代数方程组的算法，实现了非常高效的计算。模型和数值算法进行了验证，通过比较与仿真结果从参考使用有限元方法。DBHE的性能，然后评估参数分析。文中给出了DBHE的标称容量与其关键参数（如钻孔深度、地热通量和地下导热系数）之间的关系图，可供工程实践参考。研究还表明，高阻力内管有助于提高DBHE的传热能力。
Being a promising technique for seasonal thermal energy storage, the deep borehole heat exchanger (DBHE) has also provided a new variance of ground-coupled heat pump systems especially for applications in cold-climate regions. Numerical simulations are recognized as the appropriate means in the study on heat transfer around the deep boreholes, which often features time-consuming computations. A model has been established in this study for DBHEs with coaxial tubes, considering coupled heat transfer in the tubes and surrounding subsurface. A software package is developed based on the finite difference method for thermal analysis of the DBHEs, and an algorithm for direct solution of resulted algebraic equation set is used so as to achieve very efficient computation. The model and the numerical algorithm are validated by comparison with simulation results from a reference using the finite element method. Performance of DBHEs is then assessed with parameter analyses. A diagram is presented to show relations of the nominal DBHE capacity to its key parameters such as the borehole depth, geothermal heat flux and thermal conductivity of subsurface, which is helpful in engineering practice. Studies also indicate that a high-resistance inner pipe helps in improving the heat transfer capacity of DBHEs.
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DOI：
10.1016/s0017-9310(03)00270-9
发表时间：
2003-11
影响因子：
5.2
作者：
H. Zeng;N. Diao;Z. Fang
通讯作者：
H. Zeng;N. Diao;Z. Fang
DOI：
10.5772/38890
发表时间：
2012-05
期刊：
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影响因子：
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作者：
M. Yi;Cui Ping;Fang Zhaohong
通讯作者：
M. Yi;Cui Ping;Fang Zhaohong
影响因子：
3.9
作者：
Lamarche, Louis;Kajl, Stanislaw;Beauchamp, Benoit
通讯作者：
Beauchamp, Benoit
DOI：
10.1016/s0278-6125(99)90104-8
发表时间：
1998-05
期刊：
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影响因子：
--
作者：
W. Rohsenow;J. Hartnett;Young I. Cho
通讯作者：
W. Rohsenow;J. Hartnett;Young I. Cho
DOI：
10.1201/9781003206125
发表时间：
2018-05
期刊：
--
影响因子：
--
作者：
G. Naterer
通讯作者：
G. Naterer