Effect of disturbance on thermal response test, part 2: Numerical study of applicability and limitation of infinite line source model for interpretation under disturbance from outdoor environment

2016 ◽  
Vol 85 ◽  
pp. 1090-1105 ◽  
Author(s):  
Wonjun Choi ◽  
Ryozo Ooka
Keyword(s):  
Line Source ◽  
Numerical Study ◽  
Thermal Response ◽  
Source Model ◽  
Outdoor Environment ◽  
Thermal Response Test ◽  
Response Test ◽  
Test Part ◽  
Infinite Line ◽  
Line Source Model

scholarly journals A Novel Approach to the Analysis of Thermal Response Test (TRT) with Interrupted Power Input

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5033
Author(s):  
Jin Luo ◽  
Yuhao Zhang ◽  
Jiasheng Tuo ◽  
Wei Xue ◽  
Joachim Rohn ◽  
...  
Keyword(s):  
Thermal Response ◽  
Power Input ◽  
Source Model ◽  
Thermal Parameters ◽  
Time Interval ◽  
Superposition Method ◽  
Thermal Response Test ◽  
Response Test ◽  
Novel Approach

The quality of measuring datasets of the thermal response test (TRT) significantly influences the interpretation of borehole thermal parameters (BTP). A thermal response test with an unstable power input may induce an unacceptable error in the estimation of the borehole thermal parameters. This paper proposes a novel approach to treat the dataset with interrupted power input. In this approach, the test records were segmented into several subsections with a constant time interval of 100 min, 60 min, and 30 min, separately. The quality of each data section was assessed and analyzed. Then, two algorithms, including the continuous algorithm and semi-superposition algorithm, were developed. The results estimated by the linear source model (LSM) were compared with one Thermal response test datasets with a stable power input at the same testing site. It shows that the effects of power interruption during the test can be effectively mitigated by deploying both the continuous and semi-superposition methods. The lowest deviation of the calculated thermal conductivity to a thermal response test with stable power input was 2.8% in the continuous method and 0.9% using the semi-superposition method. Thus, the proposed approaches are effective measures to mitigate the effects of interrupted power input on the interpretation of the thermal properties of the ground.

scholarly journals A laboratory apparatus to study Thermal Response Test in the presence of groundwater flow

2019 ◽  
Vol 111 ◽  
pp. 01067 ◽  
Author(s):  
Adriana Angelotti ◽  
Luca Molinaroli
Keyword(s):  
Heat Transfer ◽  
Groundwater Flow ◽  
Thermal Response ◽  
Source Model ◽  
Thermal Response Test ◽  
Laboratory Apparatus ◽  
Groundwater Velocity ◽  
Response Test ◽  
Sand Box ◽  
Original Laboratory

The standard approach to Thermal Response Test, based on conduction heat transfer in the ground, turns out to be unsuccessful under significant groundwater flow. The applicability of the Moving Infinite Line Source model to interpret the TRT in this case still needs to be proved. In order to study the TRT in the presence of a groundwater flow, an original laboratory apparatus has been developed. The Sand Box design is based on a heat transfer similitude between the real scale TRT problem and the laboratory scale one. The Sand Box sizes (1,2 m x 0.6 m x 1.0 m) are then set in order to keep the boundaries unaffected by the heat source during the TRT. The U-pipe heat exchanger is reproduced through a twocables electrical resistance 1 m long. A hydraulic loop with a peristaltic pump allows to obtain a Darcy velocity across the sandy soil up to 6,7510-5 m/s. The measurement system consists in several thermocouples in the porous medium and in a flow meter. The TRT results at null groundwater velocity allow to derive a reference thermal conductivity. The first tests with groundwater flow show the suitability of the apparatus and allow to derive some preliminary considerations.

Thermal and hydrogeological aquifers characterization by coupling depth-resolved thermal response test with moving line source analysis

2020 ◽  
Vol 225 ◽  
pp. 113400
Author(s):  
Matteo Antelmi ◽  
Luca Alberti ◽  
Adriana Angelotti ◽  
Sara Curnis ◽  
Andrea Zille ◽  
...  
Keyword(s):  
Line Source ◽  
Thermal Response ◽  
Source Analysis ◽  
Thermal Response Test ◽  
Response Test ◽  
Moving Line Source ◽  
Moving Line

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

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4379
Author(s):  
Max Hesselbrandt ◽  
Mikael Erlström ◽  
Daniel Sopher ◽  
Jose Acuna
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Thermal Response ◽  
Site Investigation ◽  
Thermal Response Test ◽  
Response Test ◽  
Crystalline Bedrock

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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