Borehole temperature distribution during Thermal Response Test

Boban, Luka and Soldo, Vladimir and Mandić, Marko (2016) Borehole temperature distribution during Thermal Response Test. = Borehole temperature distribution during Thermal Response Test. In: Energija i okoliš 2016., 26.-28.10.2016., Opatija, Hrvatska.

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Study on shallow geothermal energy in Republic of Croatia as part of EU funded project „Research and promotion of shallow geothermal potential in Croatia” included drilling of exploratory borehole on location of Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb. Grouted 130 m deep borehole incorporates double U pipe heat exchanger equipped with fiber optic cables for distributed temperature sensing. Separate optic cables are placed inside one U pipe of heat exchanger and in borehole grouting. Such configuration of measuring equipment enables monitoring of vertical temperature distribution along the borehole heat exchanger and horizontal temperature distribution inside the borehole cross section. Borehole heat exchanger was subjected to the distributed thermal response test consisting of three stages to determine thermal parameters relevant for the design of ground coupled heat pump system. First measurements are carried out without water circulation to determine undisturbed ground temperature profile, second stage involved 120 hour long heating of the underground with constant heat flux and in the last phase of the test, thermal recovery of the borehole was observed for two weeks. Analytical interpretation of thermal response test results yielded effective thermal conductivity of 1.66 W/(m K) and effective borehole thermal resistance of 0.072 (m K)/W. Vertical temperature profiles of undisturbed and disturbed ground are presented and influence of fluid temperature distribution on a results of thermal response test discussed.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): distributed thermal response test; shallow geothermal energy; ground thermal parameters
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 300 Department of Thermodynamics, Thermal and Process Engineering > 320 Chair of Thermal and Process Engineering
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 09 Feb 2017 10:46
Last Modified: 09 Feb 2018 13:29

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