The use of borehole thermal energy storage (BTES) systems

Summary Seasonal energy storage is an important component to cope with the challenges resulting from fluctuating renewable energy sources and the corresponding mismatch of energy demand and supply. The storage of heat via medium deep borehole heat exchangers is a new approach in the field of Borehole Thermal Energy Storage. In contrast to conventional borehole storages, fewer, but deeper borehole heat exchangers tap into the subsurface, which serves as the storage medium. As a result, the thermal impact on shallow aquifers is strongly reduced mitigating negative effects on the drinking water quality. Furthermore, less surface area is required. However, there are no operational experiences, as the concept has not been put into practice so far. In this study, more than 250 different numerical storage models are compared. The influence of the characteristic design parameters on the storage system's behaviour and performance is analysed by variation of parameters like borefield layout, fluid inlet temperatures and properties of the reservoir rocks. The results indicate that especially larger systems have a high potential for efficient seasonal heat storage. Several GWh of thermal energy can be stored during summertime and extracted during the heating period with a high recovery rate of up to 83%. Medium deep borehole heat exchanger arrays are suitable thermal storages for fluctuating renewable energy sources and waste heat from industrial processes. Copyright © 2016 John Wiley & Sons, Ltd.

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“…In this way, BTES can access a large storage volume at relatively low expenses . A detailed technology description is given by Reuss .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of medium deep borehole thermal energy storage

Welsch

Rühaak

Schulte

et al. 2016

Int. J. Energy Res.

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“…In order to achieve a proper heat transport into and from the ground, a high thermal conductivity is desirable, while from the point of view of heat losses the thermal conductivity should be as low as possible. In porous underground a high groundwater can increase the heat capacity, while groundwater flow can reduce the performance of BTES significantly, because of increasing losses due to convective heat transport [8].…”

Section: Review Of the Literaturementioning

confidence: 99%

The possibilities of energy storage in bulk materials

Ratuszny

2018

E3S Web Conf.

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The increased demand for energy from renewable sources entails the development of storage systems. The purpose of these systems is to supply energy on demand during periods which may not be concurrent with the time of the most efficient production of this energy. Various systems are being developed for storing energy in various forms and over various lengths of time.This paper presents selected projects and the results of studies into thermal energy storage. The results of the present author's own research into the transport of thermal energy in granular beds are also presented. The curves of temperature distribution have been determined; they are essential for the design of the thermal storage of a granular bed. Such curves need to be determined for the given granular bed and for the conditions of its operation

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“…The thermal response and heat transfer performance of GHEs are importance to the design and operation of GCHP systems [6]. To interpret thermal response tests (TRTs) performed to characterize the thermal response of GHEs, heat source models of GHE are needed [7]. Further, GHE heat source models are necessary for the design of GCHP systems, and analytical models are preferred by designers due to their speed and ease of implementation.…”

Section: Introductionmentioning

confidence: 99%

A novel analytical multilayer cylindrical heat source model for vertical ground heat exchangers installed in layered ground

Pan

McCartney

et al. 2020

Energy

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This paper presents a new analytical multilayer cylindrical heat source model for vertical ground heat exchangers (GHEs) installed in layered ground using the new integral-transform method. The analytical model was validated by model degradation, numerical simulation, and a laboratory-scale experiment. Results indicate that temperature profiles of vertical GHEs in layered ground are quite different from those in homogeneous ground, and that temperature differences increase with time. Thermal property differences between ground layers were found to result in additional vertical heat transfer across layer interfaces, which is not observed in homogeneous ground. Cross-layer thermal interaction was found to be stronger when thermal property differences are larger. The new cylindrical heat source model was also compared with the multilayer line heat source model, and it was found that differences between the two models decrease with time. Further, larger GHE thermal loads and smaller ground thermal conductivity values led to larger error of multilayer line heat source model. The new multilayer cylindrical heat source model was found to be suitable for quickly considering the effects of ground stratification on the design of vertical GHEs. *Revised Manuscript with No Changes Marked Click here to view linked References

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The use of borehole thermal energy storage (BTES) systems

Cited by 33 publications

References 1 publication

Characteristics of medium deep borehole thermal energy storage

Characteristics of medium deep borehole thermal energy storage

The possibilities of energy storage in bulk materials

A novel analytical multilayer cylindrical heat source model for vertical ground heat exchangers installed in layered ground

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