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A new method for analysis of constant-temperature thermal response tests
Bochum Univ Appl Sci, Int Geothermal Ctr, D-44801 Bochum, Germany;Istanbul Tech Univ, Energy Inst, TR-34469 Istanbul, Turkey.
Univ Tulsa, McDougall Sch Petr Engn, Tulsa, OK 74104 USA.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Istanbul Tech Univ, Energy Inst, TR-34469 Istanbul, Turkey.ORCID iD: 0000-0002-7431-5115
2019 (English)In: Geothermics, ISSN 0375-6505, E-ISSN 1879-3576, Vol. 78, p. 1-8Article in journal (Refereed) Published
Abstract [en]

In this study, a new analysis method is proposed for estimating thermal conductivity of a ground by using the constant-temperature thermal response test data. The new method is based on an analytical solution of heat transfer rate per unit borehole length by using the Laplace transformation for constant-temperature thermal response tests. Its advantage is that it allows one to estimate thermal conductivity directly from the slope of the logarithmic time dependency of inverse unit-heat-transfer rate value without making an estimation of volumetric heat capacity. The method has been verified by using a numerical model and applied to different experimental data based on different test temperatures and compared with the classical thermal response test method. The results show that the proposed method reliably and effectively estimates thermal conductivity of ground.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 78, p. 1-8
Keywords [en]
Ground source heat pumps, Thermal properties of borehole, Thermal response test
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:uu:diva-378634DOI: 10.1016/j.geothermics.2018.11.001ISI: 000458467900001OAI: oai:DiVA.org:uu-378634DiVA, id: diva2:1294577
Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-03-07Bibliographically approved

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Sisman, Altug

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