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FREEZING PROBLEMS IN BOREHOLE HEAT EXCHANGERS
2007There are approximately 300,000 borehole systems in Sweden with an annual growth rate of 30,000 systems. Such borehole systems are mainly used for heating of single family houses but in recent years several hundred larger systems, for both heating and cooling, have been constructed.
Bo Nordell, Anna-Karin Ahlström
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Thermal interaction between tunnel ground heat exchangers and borehole heat exchangers
Geomechanics for Energy and the Environment, 2017Renewable geothermal energy is an energy source that can be used for heating and cooling purposes. One common method of harvesting this energy is using engineering structures in contact with the ground, such as structural piles, diaphragm walls or tunnels (with geothermal loops integrated into the tunnel lining/invert (tunnel ground heat exchangers ...
Asal Bidarmaghz +4 more
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Heat transfer analysis of short helical borehole heat exchangers
Applied Energy, 2013Abstract In this paper a numerical model to analyze the thermal behaviour of vertical ground heat exchangers with a helical shaped pipe is presented. This type of configuration can be a suitable alternative to conventional ground heat exchangers, especially when the heating and cooling loads of the building are very low. The model describes the heat
ZARRELLA, ANGELO, DE CARLI, MICHELE
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Journal of Energy Storage, 2021
Borehole heat exchanger (BHE) is a very suitable and cost-effective technology for heat storage and extraction of heat from the ground. In this paper, comprehensive analysis of major influencing parameters on thermal performance of single U-tube BHE ...
E. Kerme, A. Fung
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Borehole heat exchanger (BHE) is a very suitable and cost-effective technology for heat storage and extraction of heat from the ground. In this paper, comprehensive analysis of major influencing parameters on thermal performance of single U-tube BHE ...
E. Kerme, A. Fung
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, 2021
The horizontally-butted borehole heat exchanger (BHE) can be used to extract heat efficiently from medium-deep strata, where the groundwater seepage and undisturbed geothermal gradient are critical influence factors.
Jiang Guosheng +5 more
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The horizontally-butted borehole heat exchanger (BHE) can be used to extract heat efficiently from medium-deep strata, where the groundwater seepage and undisturbed geothermal gradient are critical influence factors.
Jiang Guosheng +5 more
semanticscholar +1 more source
, 2021
In the ground coupled heat pump system that delivers space heating and cooling to the buildings, often questions are raised as to which borehole heat exchanger configuration (single or double U-tube) provides higher thermal performance.
E. Kerme, A. Fung
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In the ground coupled heat pump system that delivers space heating and cooling to the buildings, often questions are raised as to which borehole heat exchanger configuration (single or double U-tube) provides higher thermal performance.
E. Kerme, A. Fung
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Efficient numerical modeling of borehole heat exchangers
Computers & Geosciences, 2010This paper presents a finite element modeling technique for double U-tube borehole heat exchangers (BHE) and the surrounding soil mass. Focus is placed on presenting numerical analyses describing the capability of a BHE model, previously reported, to simulate three-dimensional heat transfer processes in multiple borehole heat exchangers embedded in a ...
R. Al-Khoury, T. Kölbel, R. Schramedei
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Experiences with the Borehole Heat Exchanger
2018Renewable energy sources have one thing in common; they all existed before man appeared on this planet. Wind, wave, hydro, solar, geothermal and tidal powers are all forces of nature and are mostly intermittent energy sources, geothermal is the only consistent phenomenon.
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A novel enhanced deep borehole heat exchanger for building heating
Applied Thermal Engineering, 2020Abstract Deep borehole heat exchanger (DBHE) technology can be used in various regions due to without dependence on the hot water reservoir. However, its performance can hardly be improved due to poor thermal conductivity of rocks and cement. Here a novel enhanced deep borehole heat exchanger (EDBHE) is first proposed, which applies composite filler,
Yujiang He, Xianbiao Bu
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