Evaluation of Eight Years of Operation of a High Temperature Solar Thermal Seasonal Borehole Storage

Heier, Johan; Bales, Chris; Sotnikov, Artem; Ponomarova, Ganna

doi:10.18086/swc.2011.29.10

Cited by 3 publications

(6 citation statements)

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“…One reason mentioned is that the storage itself was still charging at the time of the evaluation, and therefore had still not reached optimal performance. The low solar fraction for the system was however confirmed by Heier et al [110] in a more recent evaluation, showing similar values even though the borehole storage has reached its final temperatures. It is concluded that the borehole storage itself works as planned but that one reason for the low solar fraction is high heat losses from the distribution system.…”

Section: Borehole Storagesupporting

confidence: 55%

“…Seasonal storage for a particular residential complex using boreholes is discussed and evaluated by Nordell and Hellström [108], Lundh and Dalenbäck [109] and Heier et al [110]. Nordell and Hellström [108] have conducted a preliminary study for the residential complex and present a suggestion for a heating system with 3000 m 2 of solar collectors in combination with a seasonal borehole storage of 60,000 m 3 , from which the heat will be used without the use of heat pumps.…”

Section: Borehole Storagementioning

confidence: 99%

“…The solar fraction for this system was lower than expected (between 21-33% instead of projected 43%) and reasons given are higher heat demand from the buildings and higher return temperatures to the store. For a seasonal borehole storage evaluated by Heier et al [110] the borehole storage itself is shown to have a yearly heat loss of approximately 50% of the solar energy that is charged into the store.…”

Section: 234mentioning

confidence: 99%

“…The low heating/cooling demand in this type of building makes other seasonal storage options difficult due to large relative heat losses. Examples for larger seasonal storage, such as aquifer or borehole storage, show that roughly half of the energy stored ends up as heat losses [106,110].…”

Section: Concluding Remarks For Active Storage Systemsmentioning

confidence: 99%

See 3 more Smart Citations

Combining thermal energy storage with buildings – a review

Heier

Bales

Martin

2015

Renewable and Sustainable Energy Reviews

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125

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Section: Borehole Storagesupporting

confidence: 55%

Section: Borehole Storagementioning

confidence: 99%

Section: 234mentioning

confidence: 99%

Section: Concluding Remarks For Active Storage Systemsmentioning

confidence: 99%

See 2 more Smart Citations

Combining thermal energy storage with buildings – a review

Heier

Bales

Martin

2015

Renewable and Sustainable Energy Reviews

Self Cite

313

125

View full text Add to dashboard Cite

“…The solar fraction for this system was lower than expected (between 21 and 33% instead of a projected 43%), and the reasons given are a higher heat demand from the buildings and higher return temperatures to the store. For a seasonal borehole storage evaluated by Heier et al [33], the borehole storage itself is shown to have a yearly heat loss of approximately 50% of the solar energy that is charged into the store.…”

Section: Underground Storagementioning

confidence: 99%

A Comprehensive Review of Thermal Energy Storage

2018

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Thermal energy storage (TES) is a technology that stocks thermal energy by heating or cooling a storage medium so that the stored energy can be used at a later time for heating and cooling applications and power generation. TES systems are used particularly in buildings and in industrial processes. This paper is focused on TES technologies that provide a way of valorizing solar heat and reducing the energy demand of buildings. The principles of several energy storage methods and calculation of storage capacities are described. Sensible heat storage technologies, including water tank, underground, and packed-bed storage methods, are briefly reviewed. Additionally, latent-heat storage systems associated with phase-change materials for use in solar heating/cooling of buildings, solar water heating, heat-pump systems, and concentrating solar power plants as well as thermo-chemical storage are discussed. Finally, cool thermal energy storage is also briefly reviewed and outstanding information on the performance and costs of TES systems are included.

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Characteristics of medium deep borehole thermal energy storage

Welsch

Rühaak

Schulte

et al. 2016

Int. J. Energy Res.

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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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Evaluation of Eight Years of Operation of a High Temperature Solar Thermal Seasonal Borehole Storage

Cited by 3 publications

References 0 publications

Combining thermal energy storage with buildings – a review

Combining thermal energy storage with buildings – a review

A Comprehensive Review of Thermal Energy Storage

Characteristics of medium deep borehole thermal energy storage

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