Finite element modeling of borehole heat exchanger systems

Diersch, Hans‐Jörg G.; Bauer, Dan; Heidemann, W.; Rühaak, W.; Schätzl, P.

doi:10.1016/j.cageo.2010.08.002

Cited by 152 publications

(69 citation statements)

References 6 publications

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“…This is achieved by building the well locations and supporting nodes around them directly into the mesh. The supporting nodes are located at a given distance (Δ) from the wells to optimize mesh refinement, which was determined based on the formula by Diersch et al (2011): where r b is the borehole radius, and a is a constant dependent on the number of nodes. In this case, we used six supporting nodes for each borehole which is a common standard for triangular, horizontal meshes (Diersch et al 2011).…”

Section: Spatial Discretizationmentioning

confidence: 99%

A numerical investigation of combined heat storage and extraction in deep geothermal reservoirs

2018

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Section: Spatial Discretizationmentioning

confidence: 99%

A numerical investigation of combined heat storage and extraction in deep geothermal reservoirs

2018

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“…Currently the vast majority of underground thermal energy storage systems (UTES) such as borehole thermal energy storage (BTES) and the previously described ATES systems, operate at low temperatures <30°C (Sanner et al 2003;Diersch et al 2011); although, the storage of higher temperatures has the advantage that the groundwater can be used directly for heating and no additional energy is necessary to operate the heat pumps. However, the current legal situation in many countries only allows a maximum injection temperature of 25°C (Haehnlein et al 2010).…”

Section: Geo-exchange Systemsmentioning

confidence: 99%

Preface: Hydrogeology of shallow thermal systems

et al. 2013

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“…Hence, Neumann boundary condition was set (q=0 W/m 2 ). The upper surface exposed to variable atmospheric conditions was modeled by the following equation which takes into account heat transfer by convection (effect of wind speed) and radiation [5].…”

Section: Storing Domainmentioning

confidence: 99%

Assessment of Heat Recovery and Recovery Efficiency of a Seasonal Thermal Energy Storage System in a Moist Porous Medium

Dada¹,

Benchatti²

2016

IJHT

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Thermal energy storage has received a great interest by researchers and industrials as part of designing new systems able to store and deliver thermal energy efficiently for long periods, especially in regions characterized by important solar energy potential. The aim of this preliminary work is to simulate the performance of a novel seasonal heat storage system dedicated to store heat in the ground during hot period then to recover it during cold period. The system investigated herein is a ground heat exchanger buried at only 8 m below the underground while other technologies go deeper than 100 m. Several case studies have been simulated according to different types of hot fluid carrier and moisture content of the porous medium. Comsol Multiphysics was used to model heat exchange between a fluid carrier flowing through a GHX, and a partially saturated porous medium composed essentially of gravel and located at about 0.5 m underground. Performance of the system was evaluated for a one-year period in order to get a good estimation of long-term heat storage and recovery. The results showed that the use of gasoline as a fluid carrier will yield higher temperature levels than the other fluids particularly during cold season; however, the use of water allowed for the storage and recovery of bigger heat energy than gasoline or glycol do. However, moisture content of the porous medium did not influence the whole process. System heat recovery has been enhanced by the use of two ducts to extract more heat from the underground. This approach led to a remarkable increase in temperature levels, as well as heat energy and recovery efficiency which went up from 41% when using only 1 duct to 71%.

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Finite element modeling of borehole heat exchanger systems

Cited by 152 publications

References 6 publications

A numerical investigation of combined heat storage and extraction in deep geothermal reservoirs

A numerical investigation of combined heat storage and extraction in deep geothermal reservoirs

Preface: Hydrogeology of shallow thermal systems

Assessment of Heat Recovery and Recovery Efficiency of a Seasonal Thermal Energy Storage System in a Moist Porous Medium

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