High temperature borehole thermal energy storage - A case study

Malmberg, Malin; Mazzotti, Willem; Acuña, José; Lindståhl, Henrik; Lazzarotto, Alberto

doi:10.22488/okstate.18.000036

Cited by 4 publications

(3 citation statements)

References 5 publications

(7 reference statements)

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“…As mentioned previously, one feature of the DST model is that the arrangement cannot be changed by users. Thus, the DST model is typically used for simulations of BTES systems [24][25][26] or GSHP systems with a small number of BHEs, where the arrangement is relatively unimportant for low thermal-interference effects among the BHEs [12,27].…”

Section: Dst Modelmentioning

confidence: 99%

Optimal Sizing of Irregularly Arranged Boreholes Using Duct-Storage Model

Park

Kim

2019

Sustainability

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As the sizing of borehole heat exchangers (BHEs) is crucial for ground-source heat pump systems, which are becoming increasingly complex and diverse, novel sizing tools are required that can size both boreholes and connected systems. Thus, an optimization-based sizing method that runs in TRNSYS with other component models is proposed. With a focus on the feasibility of the method for typical BHEs, the sizing of irregularly placed boreholes using the well-known duct-storage (DST) model that inherently cannot describe irregular borefields is examined. Recently developed modification methods are used for the DST model. The proposed sizing method is compared with the existing ground loop heat exchanger (GLHE) sizing program. The results indicate that the proposed method has a genuine difference of approximately 3% compared with the GLHE, and the difference increases with the thermal-interference effects. A regression-based method selected to modify the DST model for describing irregular borefields exhibits acceptable sizing results (approximately 5% for test cases) despite the genuine difference. This study is the first to use the DST model for sizing BHEs under irregular borefield configurations, and the tests indicated acceptable results with an approximate difference of one borehole among a total of 30 boreholes in the test cases.

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Section: Dst Modelmentioning

confidence: 99%

Optimal Sizing of Irregularly Arranged Boreholes Using Duct-Storage Model

Park

Kim

2019

Sustainability

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“…Typically, these systems operate at temperatures that are relatively close to the undisturbed or natural temperate of the subsurface. Only a few high temperature BTES (HT-BTES) systems, which operate at temperatures significantly above ambient conditions, have been built [3]. However, due to social, environmental, and economic drivers, interest in using HT-BTES systems for storing large amounts of waste heat at high temperatures (50 to 100 • C) is presently increasing.…”

Section: Introductionmentioning

confidence: 99%

“…If the geological, social, and techno-economical prerequisites are met for the site, it could become one of the largest HT-BTES systems in the world. Earlier modeling work of a potential HT-BTES system in Linköping is described in [7], where the Precambrian crystalline bedrock is considered as the storage medium. According to that study, a heat pump-supported HT-BTES system consisting of 1300 to 1500 BHEs with 300 m depth shows a potential to store and extract up to c. 90 GWh annually.…”

Section: Introductionmentioning

confidence: 99%

Multidisciplinary Approaches for Assessing a High Temperature Borehole Thermal Energy Storage Facility at Linköping, Sweden

Hesselbrandt¹,

Erlström

Sopher

et al. 2021

Energies

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Assessing the optimal placement and design of a large-scale high temperature energy storage system in crystalline bedrock is a challenging task. This study applies and evaluates various methods and strategies for pre-site investigation for a potential high temperature borehole thermal energy storage (HT-BTES) system at Linköping in Sweden. The storage is required to shift approximately 70 GWh of excess heat generated from a waste incineration plant during the summer to the winter season. Ideally, the site for the HT-BTES system should be able to accommodate up to 1400 wells to 300 m depth. The presence of major fracture zones, high groundwater flow, anisotropic thermal properties, and thick Quaternary overburden are all factors that play an important role in the performance of an HT-BTES system. Inadequate input data to the modeling and design increases the risk of unsatisfactory performance, unwanted thermal impact on the surroundings, and suboptimal placement of the HT-BTES system, especially in a complex crystalline bedrock setting. Hence, it is crucial that the subsurface geological conditions and associated thermal properties are suitably characterized as part of pre-investigation work. In this study, we utilize a range of methods for pre-site investigation in the greater Distorp area, in the vicinity of Linköping. Ground geophysical methods, including magnetic and Very Low-Frequency (VLF) measurements, are collected across the study area together with outcrop observations and lab analysis on rock samples. Borehole investigations are conducted, including Thermal Response Test (TRT) and Distributed Thermal Response Test (DTRT) measurements, as well as geophysical wireline logging. Drone-based photogrammetry is also applied to characterize the fracture distribution and orientation in outcrops. In the case of the Distorp site, these methods have proven to give useful information to optimize the placement of the HT-BTES system and to inform design and modeling work. Furthermore, many of the methods applied in the study have proven to require only a fraction of the resources required to drill a single well, and hence, can be considered relatively efficient.

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Buildings sector from a sustainable carbon constrained energy generation perspective

Nilay

Tarı²

2022

Energy and Buildings

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High temperature borehole thermal energy storage - A case study

Cited by 4 publications

References 5 publications

Optimal Sizing of Irregularly Arranged Boreholes Using Duct-Storage Model

Optimal Sizing of Irregularly Arranged Boreholes Using Duct-Storage Model

Multidisciplinary Approaches for Assessing a High Temperature Borehole Thermal Energy Storage Facility at Linköping, Sweden

Buildings sector from a sustainable carbon constrained energy generation perspective

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