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Analytical model for short-time responses of ground heat exchangers with U-shaped tubes: Model development and validation

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WOS被引频次:61
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成果类型:
期刊论文
作者:
Li, Min*;Lai, Alvin C.K.
通讯作者:
Li, Min
作者机构:
[Li, Min] Cent S Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.
[Lai, Alvin C.K.] City Univ Hong Kong, Dept Civil & Architectural Engn, Kowloon, Hong Kong, Peoples R China.
通讯机构:
[Li, Min] Cent S Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.
语种:
英文
关键词:
Borehole ground heat exchanger;Ground-coupled heat pump;Composite-medium line-source model;Short-time response;Pile ground heat exchanger
期刊:
Applied Energy
ISSN:
0306-2619
年:
2013
卷:
104
页码:
510-516
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:工程学;WOS学科类别:Energy & Fuels;Engineering, Chemical
入藏号:
WOS:000316152700052;EI:20130215886509
机构署名:
本校为第一且通讯机构
院系归属:
能源科学与工程学院
摘要:
Short-time responses of borehole ground heat exchangers (GHEs) are difficult to predict because they involve heat capacity effect and various arrangements of U-shaped tubes within boreholes. To meet this engineering challenge, this paper builds a composite-medium line-source model. The central idea of the new model is that the downward and upward channels of U-shaped tubes (not the borehole) are approximated as line sources or sinks of heat placed in a composite medium. This approach can account for not only the influence of the heat capacity of grouting material but also the difference between properties of soil and grout, whilst it is flexible enough to model various U-pipe configurations. The new composite-medium model is validated by using a reported laboratory experiment; it can yield predictions matching the experimental response profiles with acceptable accuracy for times as short as 5 min. Several uncertainties which may contribute to discrepancies between the model prediction and the laboratory data are analyzed, including heat input rate, thermal conductivities and heat capacities of the composite medium. The potential errors caused by these uncertainties are comparable to the observed discrepancies. (C) 2012 Elsevier Ltd. All rights reserved.
参考文献:
Bandyopadhyay G, 2008, ENERG BUILDINGS, V40, P1816, DOI 10.1016/j.enbuild.2008.04.005
Bandyopadhyay G, 2008, ASHRAE TRAN, V114, P428
Beier RA, 2003, ASHRAE T, V109, P475
Beier RA, 2011, GEOTHERMICS, V40, P79, DOI 10.1016/j.geothermics.2010.12.007
Chiasson AD, 2010, ASHRAE TRAN, V116, P512

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