Monitoring of the thermal plume around a thermally activated borehole heat exchanger and characterization of the ground hydro-geothermal parameters

Gigot, Valériane; Francois, Bertrand; Huysmans, Marijke; Gerard, Pierre

doi:10.1016/j.renene.2023.119250

Cited by 3 publications

(2 citation statements)

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“…The physical properties of the fluid can be obtained directly from the COMSOL6.1's built-in material library. Formula (2) shows that for a low Reynolds number (laminar flow), the friction coefficient is 64/Re, and for a very high Reynolds number, the friction coefficient is independent of Re.…”

Section: Flow Equations In the Pipelinementioning

confidence: 99%

“…It has significant advantages such as a low cost, high efficiency, winter heating and summer cooling, and a long service duration [1]. Shallow geothermal energy is mainly extracted using buried pipes [2][3][4]. At present, scholars have conducted a lot of research on the heat transfer mechanism and heat transfer efficiency of single buried pipe groups [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Mechanism of Heat–Cold Alternate Extraction in a Shallow Geothermal Buried Pipe System under Multiple Heat Exchanger Groups

Shi,

Zhang,

Wang

et al. 2023

Energies

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Shallow geothermal energy usually uses underground buried pipes to achieve the purpose of extracting heat while storing cold in winter and extracting cold while storing heat in summer. However, the heat transfer mechanism under the alternate operation of heat–cold extraction in winter and summer under multiple heat exchanger groups is still worth studying. Based on the constructed flow and heat transfer model in pipelines and reservoirs, this study first analyzes the temperature field evolution of a shallow buried pipe system (SBPS) under the alternate operation of heat–cold extraction, and then discusses the heat transfer performance under different pipeline flow rates, pipeline wall thermal conductivity, heat injection durations, numbers of heat exchanger groups, and flows of underground fluid. The results show that the continuous alternating process of heat–cold extraction has a promoting effect on the temperature increase or decrease in the next operating cycle due to the low- or high-temperature zone produced in the previous operating cycle. As the number of multiple heat exchanger groups increases, the heat transfer efficiency of the SBPS significantly improves. With a rise in the groundwater flow velocity, the heat transfer efficiency first decreases and then increases.

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Section: Flow Equations In the Pipelinementioning

confidence: 99%