Thermal resistance and capacity models for borehole heat exchangers
Thermal resistance and capacity models for borehole heat exchangers
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DOI：
10.1002/er.1689
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发表时间：
2011-03
影响因子：
4.6
通讯作者：
D. Bauer;W. Heidemann;H. Müller-Steinhagen;H. Diersch
中科院分区：
文献类型：
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作者：
D. Bauer;W. Heidemann;H. Müller-Steinhagen;H. Diersch
地源热泵系统的详细设计和能量分析需要能够预测地埋管换热器（BHE）的短期行为。完全离散化模型的应用会导致大量的计算时间和大量的预处理工作。相反，分析模型提供了简单的、基于参数输入的建模和较短的计算时间，但它们通常忽略了钻孔中热量和质量传输的瞬态效应，因此不适用于短期行为的预测。为了联合收割机结合两种模型的优点，作者开发了不同类型BHE的二维热阻和容量模型。这些模型考虑了灌浆材料的容量，每个管具有一个容量，因此，有效性范围扩展到更短的时间。正确考虑管道中的流体、浆液容量和钻孔壁之间的所有热阻是重要的，因为这对模型的有效性有重大影响。与完全离散化计算相比，所开发的模型，建模工作和计算时间可以显着减少，同时仍能获得精确的结果。建议的模型对完全离散有限元模型的验证显示出非常好的协议。版权所有© 2010约翰威利父子有限公司.
The detailed design and energy analysis of ground source heat pump systems requires the ability to predict the short‐term behavior of borehole heat exchangers (BHE). The application of fully discretized models leads to extensive computation times and a substantial effort in terms of pre‐processing work. On the contrary, analytical models offer simple, parameter input‐based modeling and short computation times, but they usually disregard the transient effects of heat and mass transport in the borehole and hence are not suitable for the prediction of the short‐time behavior. In order to combine the advantages of both types of models, the authors developed two‐dimensional thermal resistance and capacity models for different types of BHE. These models take the capacity of the grouting material with one capacity per tube into account and, therefore, the range of validity is extended to shorter times. The correct consideration of all thermal resistances between the fluid in the pipes, the grout capacities and the borehole wall is important because of the significant influence on the validity of the models. With the developed models, the modeling work and the computation time can be significantly reduced compared with fully discretized computations while precise results are still achieved. The validation of the suggested models against fully discretized FEM models shows a very good agreement. Copyright © 2010 John Wiley & Sons, Ltd.