Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/80904
Title: Constant-temperature thermal response test (TRT) with both heat injection and extraction for ground source heat pump systems : methodology and a case study
Authors: Jia, J
Lee, WL 
Cheng, Y
Keywords: Analytical model
Borehole heat exchanger
Ground source heat pump system
Ground thermal conductivity
In-situ test
Thermal response test
Issue Date: 2019
Publisher: Elsevier
Source: Energy procedia, 2019, v. 158, p. 797-802 How to cite?
Journal: Energy procedia 
Abstract: An accurate estimate of site-specific underground thermal properties from thermal response tests (TRTs) is vital to the efficient and sustainable use of ground source heat pump (GSHP) systems. During a conventional TRT, the ground is perturbed by a heat injection and the response is measured in time. Despite the simplicity of the concept, conventional TRT fails to take into account the ground thermal response to heat extraction, which may affect the reliability of the thermal properties derived. To address the problem, an improved TRT based on both heat injection and extraction was proposed in this study. The improvements were demonstrated with an in-situ test carried out in Taiyuan, China. The measurement results showed that the ground thermal conductivity in Taiyuan was 1.56 W/(m K) and the borehole thermal resistance was 0.22 (m K)/W. The results also showed that, in the case of Taiyuan, ground thermal conductivities derived solely from heat injection test and heat extraction test were, respectively, 7.6% higher and 8.3% lower than that from the improved TRT. Thus, compared with the conventional TRT, the improved TRT consisting of both heat injection and extraction tests can provide test data more accurately reflect the annual performance of GSHP systems.
Description: 10th International Conference on Applied Energy, ICAE 2018, Hong Kong, 22-25 August 2018
URI: http://hdl.handle.net/10397/80904
EISSN: 1876-6102
DOI: 10.1016/j.egypro.2019.01.210
Rights: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of ICAE2018 – The 10th International Conference on Applied Energy.
The following publication Jia, J., Lee, W. L., & Cheng, Y. (2019). Constant-temperature thermal response test (TRT) with both heat injection and extraction for ground source heat pump systems: Methodology and a case study. Energy Procedia, 158, 797-802 is available at https://doi.org/10.1016/j.egypro.2019.01.210
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