Low-cost micro-thermal response test system for characterizing very shallow geothermal energy

2016 ◽  
Author(s):  
Andrea Verdecchia ◽  
Davide Brunelli ◽  
Francesco Tinti ◽  
Alberto Barbaresi ◽  
Patrizia Tassinari ◽  
...  
Keyword(s):  
Geothermal Energy ◽  
Low Cost ◽  
Thermal Response ◽  
Test System ◽  
Thermal Response Test ◽  
Response Test ◽  
Shallow Geothermal Energy ◽  
Very Shallow Geothermal Energy

Actively heated fiber optics based thermal response test

2021 ◽  
Author(s):  
Kai Gu ◽  
Bo Zhang ◽  
Bin Shi ◽  
Chun Liu ◽  
Peter Bayer ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Fiber Optics ◽  
Geothermal Energy ◽  
Thermal Response ◽  
Clean Energy ◽  
Accurate Estimation ◽  
Thermal Response Test ◽  
Investigation Method ◽  
Response Test ◽  
Shallow Geothermal Energy

<p>In the pursuit of sustainable development and the mitigation of climate change, shallow geothermal energy has been widely recognized as a type of clean energy with great potential. Accurate estimation of thermal ground properties is needed to optimally apply shallow geothermal energy technologies, which are of growing importance for the heating and cooling sector. A special challenge is posed by the often significant heterogeneity and variability of the geological media at a site.</p><p>As an innovative investigation method, we focus on the actively heated fiber optics-based thermal response test (ATRT) and its application in a borehole in Changzhou, China. A copper mesh heated optical cable (CMHC), which both serves as a heating source and a temperature sensing cable, was applied in the borehole. By inducing the electric current to the cable at a relatively low power of 26 W/m, the in-situ heating process was recorded at high depth resolution. This information serves to infer the thermal conductivity distribution along the borehole. The presented field experience reveals that the temperature rise in the early phase of the test should not be used due to initial heat accumulation caused by the outer jacket of the CMHC. The comparison of these results with those of a conventional thermal response test (TRT) and a distributed thermal response test (DTRT) in the same borehole confirmed that the ATRT result is reliable (with a difference less than 5% and 1%, respectively). Most importantly, this novel method affords much less energy and testing time.</p><p>Additionally, to estimate the uncertainty and limits associated with the method, a 2D axisymmetric numerical model based on COMSOL Multiphysics® has been developed. The results indicate that an accurate calculated thermal conductivity requires heating duration to be in the range of 90~400 min considering test efficiency and cost. Our study promotes ATRT as an advanced geothermal field investigation method and it also extends the applicability of the thermal response test as a downhole tool for measurement of soil hydraulic properties.</p>

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.

scholarly journals Comprehensive application of hydrogeological survey and in-situ thermal response test

2021 ◽  
pp. 101287
Author(s):  
Wei Song ◽  
Ziteng Li ◽  
Yue Jin ◽  
Bo Zhang ◽  
Tuanfeng Zheng
Keyword(s):  
Thermal Response ◽  
Thermal Response Test ◽  
Response Test

How to correct the ambient temperature influence on the thermal response test results

2015 ◽  
Vol 82 ◽  
pp. 39-47 ◽  
Author(s):  
Roque Borinaga-Treviño ◽  
Jose Norambuena-Contreras ◽  
Daniel Castro-Fresno
Keyword(s):  
Ambient Temperature ◽  
Thermal Response ◽  
Thermal Response Test ◽  
Test Results ◽  
Temperature Influence ◽  
Response Test

scholarly journals The analysis of the differences between the results of the thermal response test and the data from the operation of the brine-to-water heat pump’s vertical exchanger

2017 ◽  
Vol 22 ◽  
pp. 00045 ◽  
Author(s):  
Natalia Fidorów-Kaprawy ◽  
Ewelina Stefanowicz ◽  
Wojciech Mazurek ◽  
Małgorzata Szulgowska-Zgrzywa ◽  
Anna Bryszewska-Mazurek
Keyword(s):  
Thermal Response ◽  
Thermal Response Test ◽  
Response Test

An Investigation of Hydrological Effects on the Thermal Performance of Standing Column Well Using the in-situ Thermal Response Test

2019 ◽  
Vol 27 (02) ◽  
pp. 1950015 ◽  
Author(s):  
Keun Sun Chang ◽  
Young Jae Kim ◽  
Min Jun Kim
Keyword(s):  
Thermal Conductivity ◽  
Thermal Resistance ◽  
Flow Rate ◽  
Large Scale ◽  
Thermal Response ◽  
Thermal Response Test ◽  
Response Test ◽  
Geological Conditions ◽  
Wide Range ◽  
Borehole Thermal Resistance

The standing column well (SCW) for ground source heat pump (GSHP) systems is a highly promising technology with its high heat capacity and efficiency. In this study, a large-scale thermal response tester has been built, which is capable of imposing a wide range of heat on the SCW ground heat exchangers and measuring time responses of their thermal parameters. Two standing column wells in one site but with different well hydrological and geological conditions are tested to study their effects on the thermal performances. Borehole thermal resistance ([Formula: see text]) and the effective thermal conductivity ([Formula: see text]) are derived from data obtained from the thermal response test (TRT) by using a line source method. Results show that the influence of groundwater movement on the thermal conductivity of the SCW is not very significant (3.6% difference between two different geological conditions). This indicates that results of one TRT measurement can be applied to other SCWs in the same site, with which considerable time and cost are saved. The increase of circulation flow rate enhances the ground thermal conductivity moderately (4.5% increase with flow rate increase of 45%), but the borehole thermal resistance is substantially lowered (about 25.9%).

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