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Numerical and finite element analysis of heat transfer in a closed loop geothermal system
Author(s)
Date Issued
August 2013
Date Available
28T03:00:11Z August 2014
Abstract
Analysis of the thermal regime created by a geothermal borehole heat exchanger is performed using a closed form radial heat flow equation, a geothermal borehole heat exchanger design tool and a finite element model. Climatic, heat exchanger construction and building load data are entered into the heat exchanger design tool in order to create a theoretical model along with thermal parameters from a number of geological formations. Output data from the design tool model are used in conjunction with the closed form radial heat flow equation to calculate the predicted temperature with respect to time and distance from the heat exchanger for the modelled ground formations. The output data from the design tool is also used to create a number of finite element method models against which the predictions calculated using the closed form radial heat flow equation can be compared. A good correlation between the temperatures predicted by the finite element models and the closed form equation calculations is observed. However when used within its recommended limiting conditions, the closed form equation is shown to slightly underestimate the temperature of the ground when compared to the finite element model predictions. The limiting conditions associated with the closed form equation are discussed in the context of the output from the finite element method models.
Sponsorship
Irish Research Council for Science, Engineering and Technology
Type of Material
Journal Article
Publisher
Taylor & Francis
Journal
International Journal of Green Energy
Volume
11
Issue
2
Start Page
206
End Page
223
Language
English
Status of Item
Not peer reviewed
This item is made available under a Creative Commons License
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Numerical__FE_Analysis_of_Geothermal_System_UCD_OA.pdf
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