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Numerical Modelling of Solar Heat Storage Using Large Arrays of Borehole Heat Exchangers

Diersch, H.-J. G. and Rühaak, W. and Schätzl, P. and Bauer, D. and Heidemann, W. (2010):
Numerical Modelling of Solar Heat Storage Using Large Arrays of Borehole Heat Exchangers.
In: Proceedings World Geothermal Congress 2010, pp. 1-9, [Book Section]

Abstract

The storage of surplus heat in the underground and retrieval when required is a promising method for optimizing the energy efficiency of new housing estates. A new approach for the coupled numerical modelling of such problems will be presented. Here, the energy simulation software TRNSYS is directly coupled with the finite element subsurface flow and transport simulation software FEFLOW. This way it is possible to simulate the energy transfer between solar panels, building installations and thermal storage in the subsurface in an efficient and accurate manner. At the presented pilot installation the heat is transferred to the ground by using large arrays of borehole heat exchangers. For the simulation the borehole heat exchanger systems are modeled by a set of one-dimensional representations, either using a finite-element or an analytical approach. This way the calculation time is significantly reduced compared to fully discretized calculations while still achieving precise results.

Item Type: Book Section
Erschienen: 2010
Creators: Diersch, H.-J. G. and Rühaak, W. and Schätzl, P. and Bauer, D. and Heidemann, W.
Title: Numerical Modelling of Solar Heat Storage Using Large Arrays of Borehole Heat Exchangers
Language: English
Abstract:

The storage of surplus heat in the underground and retrieval when required is a promising method for optimizing the energy efficiency of new housing estates. A new approach for the coupled numerical modelling of such problems will be presented. Here, the energy simulation software TRNSYS is directly coupled with the finite element subsurface flow and transport simulation software FEFLOW. This way it is possible to simulate the energy transfer between solar panels, building installations and thermal storage in the subsurface in an efficient and accurate manner. At the presented pilot installation the heat is transferred to the ground by using large arrays of borehole heat exchangers. For the simulation the borehole heat exchanger systems are modeled by a set of one-dimensional representations, either using a finite-element or an analytical approach. This way the calculation time is significantly reduced compared to fully discretized calculations while still achieving precise results.

Title of Book: Proceedings World Geothermal Congress 2010
Uncontrolled Keywords: Numerical modeling;Heat transport;borehole heat exchangers;solar heat storage
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
Event Title: World Geothermal Congress 2010
Event Location: Bali
Event Dates: 25.-29.04.2010
Date Deposited: 06 Nov 2014 15:02
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