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Ground heat exchanger design subject to uncertainties arising from thermal response test parameter estimation
Highlights Propose a new design paradigm of ground heat exchanger (GHE) under uncertainty. Present and validate a two-variable curve fitting parameter estimation method. Provide more user-oriented GHE sizing under stakeholder specified guarantees.
Abstract This paper presents a new design paradigm of ground heat exchanger (GHE), which takes account of uncertainty in the estimation of geothermal properties, including ground thermal conductivity and borehole thermal resistance from a thermal response test (TRT). Some challenges during the TRT parameter estimation process are discussed: A sensitivity analysis to a more accurate solution of the infinite line source model is introduced to identify the parameters to be estimated; a nonlinear least-square method is employed to estimate the selected parameters; and then validated by a traversing method. Afterwards, a case study is conducted to illustrate how the proposed method can be employed to a practical engineering application. The proposed uncertainty design method that provides a quantified margin of design output can be an alternative to traditional deterministic methods that simply add safety factor to expected design value.
Ground heat exchanger design subject to uncertainties arising from thermal response test parameter estimation
Highlights Propose a new design paradigm of ground heat exchanger (GHE) under uncertainty. Present and validate a two-variable curve fitting parameter estimation method. Provide more user-oriented GHE sizing under stakeholder specified guarantees.
Abstract This paper presents a new design paradigm of ground heat exchanger (GHE), which takes account of uncertainty in the estimation of geothermal properties, including ground thermal conductivity and borehole thermal resistance from a thermal response test (TRT). Some challenges during the TRT parameter estimation process are discussed: A sensitivity analysis to a more accurate solution of the infinite line source model is introduced to identify the parameters to be estimated; a nonlinear least-square method is employed to estimate the selected parameters; and then validated by a traversing method. Afterwards, a case study is conducted to illustrate how the proposed method can be employed to a practical engineering application. The proposed uncertainty design method that provides a quantified margin of design output can be an alternative to traditional deterministic methods that simply add safety factor to expected design value.
Ground heat exchanger design subject to uncertainties arising from thermal response test parameter estimation
Zhang, Xuedan (author) / Huang, Gongsheng (author) / Jiang, Yiqiang (author) / Zhang, Tiantian (author)
Energy and Buildings ; 102 ; 442-452
2015-06-01
11 pages
Article (Journal)
Electronic Resource
English
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