Thermal impact assessment with hydrodynamics and transport modeling

Somogyi, Viola; Sebestyén, Viktor; Domokos, Endre; Zseni, Anikó; Papp, Zoltán

doi:10.1016/j.enconman.2015.04.045

Cited by 13 publications

(1 citation statement)

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“…From the hydrogeological point of view, one of the most important aspects in the use of GSHP systems is the forecast and control of the temperature in aquifers and the development of the heat perturbation in groundwater, often considered as a contaminant plume in some environmental regulations. From here, the need arises to simulate, through mathematical models, the GSHP systems in order to evaluate the impact of temperatures in the subsoil [2,3].…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Impact of Grouting Material on Borehole Heat Exchangers Performance in Aquifers

et al. 2017

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U-pipes for ground source heat pump (GSHP) installations are generally inserted in vertical boreholes back-filled with pumpable grouts. Grout thermal conductivity is a crucial parameter, dominating the borehole thermal resistance and impacting the heat exchanger efficiency. In order to seal the borehole and prevent leakages of the heat carrier fluid, grouting materials are also hydraulically impermeable, so that groundwater flow inside the borehole is inhibited. The influence of groundwater flow on the borehole heat exchangers (BHE) performance has recently been highlighted by several authors. However groundwater impact and grouting materials influence are usually evaluated separately, disregarding any combined effect. Therefore simulation is used to investigate the role of the thermal and hydraulic conductivities of the grout when the BHE operates in an aquifer with a relevant groundwater flow. Here 3 main cases for a single U-pipe in a sandy aquifer are compared. In Case 1 the borehole is back-filled with the surrounding soil formation, while a thermally enhanced grout and a low thermal conductivity grout are considered in Case 2 and Case 3 respectively. Simulations are carried out maintaining the inlet temperature constant in order to reproduce the yearly operation of the GSHP system. For each of the 3 cases three different groundwater flow velocities are considered. The results show that a high thermal conductivity grout further enhances the effects of a significant groundwater flow. The conditions when neglecting the grout material in the numerical model does not lead to relevant errors are also identified.

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Section: Introductionmentioning

confidence: 99%