Temperature of energy boreholes accounting for climate change and the built environment – A new model for its estimation

Fascì, Maria Letizia; Pallard, Willem Mazzotti; Lazzarotto, Alberto; Claesson, Joachim

doi:10.1016/j.renene.2022.12.023

Cited by 1 publication

(3 citation statements)

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“…The models we have compared are based on the strategy described by Fascì et al (2022). Each borehole is modelled as a set of 12 stacked segments on top of each other, so that it is possible to impose a uniform borehole wall temperature along the boreholes (Cimmino, 2014).…”

Section: Modelsmentioning

confidence: 99%

“…Writing equation 3 for each borehole segment we can calculate all the borehole wall temperatures in an area. For more details on the complete model we refer to Fascì et al (2022).…”

Section: Modelsmentioning

confidence: 99%

“…Models to simulate the operation of energy boreholes accounting for the underground heat island effect have been proposed. They model the effect that temperature changes in the ground surface have on the underground assuming either a homogenous or a spatially variable change of the ground surface temperature (Rivera et al 2015, Rivera et al 2016, Fascì et al 2022.…”

Section: Introductionmentioning

confidence: 99%

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Influence of buildings on geothermal boreholes – a comparison between two models

Fascì¹

2022

Proceedings of the IGSHPA Research Track 2022

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The spread of ground source heat pumps has led to the development of several models to estimate the thermal interference between independent geothermal boreholes in densely populated areas. Some of these models take into account the changes in the ground surface temperature, thus allowing to account for the heat flux from the buildings, potentially high in densely populated areas. In this study, we investigated two models accounting for the ground surface temperature change; both models are based on the Stacked Finite Line Source (SFLS) model. The first model treats the ground surface as a set of rectangles, each with its own temperature; the second model treats the ground as an infinite surface with imposed temperature. The first model is more accurate, as it allows to consider different temperatures for different surfaces. However, the second model requires less computational time and is easier to implement. Therefore, we investigated whether the latter model can provide a good approximation of the former. Our results suggest that the second model can often provide a good approximation with significantly less computational time, especially for larger built areas; however, it could be unacceptably inaccurate for smaller neighbourhoods. We also investigated a strategy to improve its accuracy without compromising its computational speed; the strategy seems promising but requires more investigation.

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Section: Modelsmentioning

confidence: 99%

“…Writing equation 3 for each borehole segment we can calculate all the borehole wall temperatures in an area. For more details on the complete model we refer to Fascì et al (2022).…”

Section: Modelsmentioning

confidence: 99%