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113001苏华

中国工程热物理学会 传热传质学 学术会议论文 编号:113001

地源热泵U形地下换热器模型比较

苏华,李茜,施恂根,李晓虹,张燕,康一亭,司子辉

(1绿色建筑与建筑节能实验室四川省高等学校重点实验室,西华大学能源与环境学院,成都 610039;

2 中国建筑西南勘察设计研究院 成都 610086)

(Tel: 028-87726100; Mobile: 13018207172; Email: [email protected]://www.doczj.com/doc/92b9b7543b3567ec102d8afe.html )

摘要:地源热泵系统设计中,地下换热器的性能预测非常重要;而地下换热器的性能预测需要准确实用的数学模型。给出了一种非稳态显式一维数值模型及其算法。比较了线热源解析模型,柱热源解析模型以及非稳态一维数值模型。并用2组实测数据验证了一维数值模型。结果表明,一维数值模型准确性较高,计算速度快,具有工程实用价值。

关键词:地源热泵;地下换热器;模型;算法 1121111

Comparison of models for U-tube ground heat exchanger

of ground source heat pump system

Su Hua 1,*, Li Qian 1, Shi Xungen2, Li Xiaohong 1, Zhang Yan 1, Kang Yiting1, Si Zihui1,

(1 School of Energy and Environment, Xihua University, Chengdu 610039, P. R. China

2 China Southwest Geotechnical Investigation and Surveying Institute, Chengdu 610086, P. R. China)

Abstract The performance prediction of vertical U-tube ground heat exchanger is important in the design of ground source heat pumps system, and precise prediction needs efficient heat transfer model. An explicit one-dimensional transient numerical model has been presented for single-borehole ground heat exchanger, and two computing algorithms are given. This one-dimensional numerical model has been compared with analytical models in constant and variable load cases; test data of two boreholes is used to validate accuracy of the numerical model. Results show that this one-dimensional numerical model is considerably accurate; the computation
al speed is fast. In general, this one-dimensional numerical model is highly efficient for simulation of ground heat exchanger.

Abstract The performance prediction of vertical U-tube ground heat exchanger is important in the design of ground source heat pumps system, and precise prediction needs efficient heat transfer model. An explicit one-dimensional transient numerical model has been presented for single-borehole ground heat exchanger, and two computing algorithms are given. This one-dimensional numerical model has been compared with analytical models in constant and variable load cases; test data of two boreholes is used to validate accuracy of the numerical model. Results show that this one-dimensional numerical model is considerably accurate; the computational speed is fast. In general, this one-dimensional numerical model is highly efficient for simulation of ground heat exchanger.

Keywords: Ground source heat pump; Ground heat exchanger; Model; Algorithm

0 引言

地源热泵系统因具有高能效的潜在优势,其应用逐步增加。地下换热器是地源热泵工程的关键,因为地下换热器关系到工程的初投资以及长期运行性能。为了设计和分析地下换热器,已经发展了很多模型。文献对国际上流行的地下换热器计算方法做过对比,对比结果显示,某些情况下这些地下换热器模型之间存在一定的计算偏差,不能

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