Natural and Artificial Methods for Regeneration of Heat Resources for Borehole Heat Exchangers to Enhance the Sustainability of Underground Thermal Storages: A Review

Śliwa, T.; Rosen, Marc A.

doi:10.3390/su71013104

Cited by 33 publications

(17 citation statements)

References 17 publications

(16 reference statements)

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“…Nam et al find that GSHP systems coupled with solar thermal energy can maintain better soil temperature balances to perform at higher COPs over the lifetime of the system [79]. Sliwa and Rosen summarize a number of natural and artificial heat regeneration options for BTES alternative to solar thermal coupling [90]. Higher temperatures of the borehole after solar charging result in higher GSHP COP's and thus less electrical energy use overall.…”

Section: Btes Principlesmentioning

confidence: 99%

Seasonal Thermal-Energy Storage: A Critical Review on BTES Systems, Modeling, and System Design for Higher System Efficiency

Lanahan

Tabares-Velasco

2017

Energies

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Abstract:Buildings consume approximately 3 4 of the total electricity generated in the United States, contributing significantly to fossil fuel emissions. Sustainable and renewable energy production can reduce fossil fuel use, but necessitates storage for energy reliability in order to compensate for the intermittency of renewable energy generation. Energy storage is critical for success in developing a sustainable energy grid because it facilitates higher renewable energy penetration by mitigating the gap between energy generation and demand. This review analyzes recent case studies-numerical and field experiments-seen by borehole thermal energy storage (BTES) in space heating and domestic hot water capacities, coupled with solar thermal energy. System design, model development, and working principle(s) are the primary focus of this analysis. A synopsis of the current efforts to effectively model BTES is presented as well. The literature review reveals that: (1) energy storage is most effective when diurnal and seasonal storage are used in conjunction; (2) no established link exists between BTES computational fluid dynamics (CFD) models integrated with whole building energy analysis tools, rather than parameter-fit component models; (3) BTES has less geographical limitations than Aquifer Thermal Energy Storage (ATES) and lower installation cost scale than hot water tanks and (4) BTES is more often used for heating than for cooling applications.

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Section: Btes Principlesmentioning

confidence: 99%

Seasonal Thermal-Energy Storage: A Critical Review on BTES Systems, Modeling, and System Design for Higher System Efficiency

Lanahan

Tabares-Velasco

2017

Energies

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“…Lower underground temperature can make HGSHP have better performance in the next-year's cycle. This process can be called underground thermal energy storage (UTES), which is a widely used technology for both heat and cold storage [15,16].…”

Section: Figurementioning

confidence: 99%

Study on Application Potential of Seasonal Thermal Energy Storage-Hybrid Ground Source Heat Pump in Taiwan—Taking Experiments in Tainan as Examples

Lin

2018

Sustainability

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Ground source heat pumps (GSHPs) are widely used in building energy conservation in many countries and regions. However, they are rarely seen in Taiwan. The main reason is the extraordinary imbalance between the heating load and cooling load of buildings in Taiwan. Hybrid ground source heat pump (HGSHP) is a hybridization of a traditional GSHP system, and can effectively balance the heat injected into and extracted from the ground over an annual cycle. This study focuses on the application of seasonal thermal energy storage HGSHP (STES-HGSHP). Based on the data of six experiments in Tainan, Taiwan, this study finds out the ways to make the process of cold energy storage run with high efficiency, including (1) increasing the flow rate in the ground coupled heat exchanger (GCHE); (2) using double-U GCHE instead of single-U GCHE; (3) starting the process of cold energy storage at the time with low wet bulb temperature; (4) storing more cold energy than necessary in order to lower the ground temperature. Finally, by analyzing the level of wet bulb temperature in winter, this study confirms that the application of STES-HGSHP has great potential in Tainan.

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“…To remedy this problem, various artificial methods of recovery of heat resources in the ground can be used e.g. using solar collectors [10]. If so, the energy obtained from the reservoir is no longer only a geothermal energy.…”

Section: Introductionmentioning

confidence: 99%

Study on the efficiency of deep borehole heat exchangers

Śliwa¹,

Nowosiad²,

Vytyaz³

et al. 2016

SOCAR Proceedings

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A b s t r a c tThe following paper shows results of several studies, carried out with the Earth Energy Designer program (EED3.21). Having used the EED, analyses on efficiency of the heat extraction were conducted, and measurements of productivity were taken in dependence of variable parameters of a theoretical deep coaxial borehole heat exchanger. The depth of 1000 m and the constant heating load 80 MWh per year were assumed for the borehole exchanger. The variables analyzed were: type of the heat carrier fluid, flow rate of the heat carrier, diameter of the borehole, wall thickness of the inner tube (insulation), diameter of the inner tube, thermal conductivity of the inner tube material, wall thickness of the outer tube, diameter of the outer tube and thermal conductivity of the outer tube material. Due to mathematical basis of the EED program, results of the calculations can be considered as diminished. To operate correctly, the program can use parameters from a borehole not deeper than 300 meters. At greater depths of borehole heat exchangers, results are understated. Therefore the results of analyses presented below can be seen as a pessimistic scenario of the calculations.

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Natural and Artificial Methods for Regeneration of Heat Resources for Borehole Heat Exchangers to Enhance the Sustainability of Underground Thermal Storages: A Review

Cited by 33 publications

References 17 publications

Seasonal Thermal-Energy Storage: A Critical Review on BTES Systems, Modeling, and System Design for Higher System Efficiency

Seasonal Thermal-Energy Storage: A Critical Review on BTES Systems, Modeling, and System Design for Higher System Efficiency

Study on Application Potential of Seasonal Thermal Energy Storage-Hybrid Ground Source Heat Pump in Taiwan—Taking Experiments in Tainan as Examples

Study on the efficiency of deep borehole heat exchangers

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