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A new method for modelling geothermal heat exchangers in shallow aquifer systems

Rühaak, W. and Schätzl, P. and Diersch, H.-J. G. and Renz, A. (2008):
A new method for modelling geothermal heat exchangers in shallow aquifer systems.
In: Numerische Grund-Wasser-Modellierung: Konzeption, komplexe Anwendung, Entscheidungsgrundlage, June, 24-25, Graz, Austria, pp. 20-23, [Online-Edition: http://www.lysimeter.com/tagung2008/Tagungsband_GWM08.pdf],
[Article]

Abstract

A new finite-element algorithm has been implemented in the commercial simulation code FEFLOW®. Borehole Heat Exchanger (BHE) systems are modelled by a set of one-dimensional finite-element representations. BHE form a closed loop system. Therefore, the thermal interaction between the heat pipes to the grout of the borehole and to the surrounding aquifer can be computed by using thermal resistances. The method, which has been published before, is further modified and generalized. Instead of using an iterative/sequential approach we developed a fast non-sequential (non-iterative) method based on a substructure finite-element method, which has been shown superior and robust. It allows the computation of single BHE or arrays of BHE of different sizes and types (single U-shape, double U-shape, coaxial) in a highly efficient and accurate manner. Different model validations are presented showing a good agreement.

Item Type: Article
Erschienen: 2008
Creators: Rühaak, W. and Schätzl, P. and Diersch, H.-J. G. and Renz, A.
Title: A new method for modelling geothermal heat exchangers in shallow aquifer systems
Language: English
Abstract:

A new finite-element algorithm has been implemented in the commercial simulation code FEFLOW®. Borehole Heat Exchanger (BHE) systems are modelled by a set of one-dimensional finite-element representations. BHE form a closed loop system. Therefore, the thermal interaction between the heat pipes to the grout of the borehole and to the surrounding aquifer can be computed by using thermal resistances. The method, which has been published before, is further modified and generalized. Instead of using an iterative/sequential approach we developed a fast non-sequential (non-iterative) method based on a substructure finite-element method, which has been shown superior and robust. It allows the computation of single BHE or arrays of BHE of different sizes and types (single U-shape, double U-shape, coaxial) in a highly efficient and accurate manner. Different model validations are presented showing a good agreement.

Journal or Publication Title: Numerische Grund-Wasser-Modellierung: Konzeption, komplexe Anwendung, Entscheidungsgrundlage, June, 24-25, Graz, Austria
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geothermal Science and Technology
Date Deposited: 16 Nov 2015 08:59
Official URL: http://www.lysimeter.com/tagung2008/Tagungsband_GWM08.pdf
Additional Information:

Date: June 2008, 24-25, City: Graz, Nation: Austria

Related URLs:
Funders: UniGraz, Das Land Steiermark, competence pool water, Joanneum Research
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