Effects of groundwater flow on thermal response test of deep borehole heat exchanger

Zhi-hu, LI; Wang, Changlong; Fu, Qiang

doi:10.1016/j.geothermics.2022.102570

Cited by 9 publications

(4 citation statements)

References 39 publications

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“…Beier et al [18] also studied the effects of layered ground thermal properties and found that adopting traditional 1D models for TRT data interpretation leads to large errors. Our previous study also found that groundwater seepage had great effects on the TRT result of a DGHE [19].…”

Section: Introductionmentioning

confidence: 68%

“…Because of a shortage of experimental data on the DTRT, this study conducts a DTRT simulation on a DCGHE based on a 3D numerical model [19], and the simulated DTRT data are used to validate the proposed new PEM.…”

Section: Dtrt Simulationmentioning

confidence: 99%

“…The 3D numerical model was developed in our previous study [19], and the main assumptions are made as follows:…”

Section: Three-dimensional Numerical Modelmentioning

confidence: 99%

“…There are a large number of studies that use the TRT to investigate shallow GHEs, but there are only a few studies that use the TRT for DGHEs [16][17][18][19]. Morchio et al [16] adopted the traditional infinite line-source model (ILSM) to estimate the ground thermal conductivity of a DGHE, but the estimation result may have had large errors, mainly caused by the low precision of the ILSM.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Layered Ground Thermal Properties for Deep Coaxial Ground Heat Exchanger

Wang,

Fu,

Sun

et al. 2023

Sustainability

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A ground heat exchanger (GHE) can efficiently exploit geothermal energy, and a ground source heat pump (GSHP) is an important type of geothermal application. The distributed thermal response test (DTRT) is widely used to measure layered ground thermal properties for shallow GHEs, but nowadays, there is a lack of studies applying the DTRT to deep coaxial GHEs (DCGHEs). This study proposes a new parameter estimation method (PEM) by adopting the DTRT data of a DCGHE to estimate layered ground thermal properties and applies the proposed PEM to simulated DTRTs under different boundary conditions, and the estimated values of the layered ground thermal properties are compared with the true values. Under heat output rate or inlet temperature boundary conditions, the relative errors of the thermal conductivities and heat capacities of ground estimated using the proposed PEM are basically within 2% and 4%, respectively, except for shallower layers with a depth range of 0–800 m. The larger errors for shallower layers may be caused by weaker heat transfer between the fluid and ground, and the errors are basically lower for higher heat output rates. The predicted fluid temperature distributions during 120 d using the estimated values of the layered ground thermal properties match well with those using the true values. The results show that the proposed PEM is viable for DCGHE DTRT interpretation under heat output rate and inlet temperature boundary conditions, is a cost-effective way to establish key parameters for GSHP design, and would promote geothermal development.

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Section: Introductionmentioning

confidence: 68%

Section: Dtrt Simulationmentioning

confidence: 99%

“…The 3D numerical model was developed in our previous study [19], and the main assumptions are made as follows:…”

Section: Three-dimensional Numerical Modelmentioning

confidence: 99%