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Determining undisturbed ground temperature for thermal response test
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
2003 (English)Conference paper, Meeting abstract (Refereed)
Abstract [en]

This study treats the determination of undisturbed ground temperature in a borehole for ground heating/cooling and its effect on the accuracy of a thermal response test analysis. Three different ways of estimating temperatures were used in one groundwater-fitted borehole in crystalline rock The first method, temperature logging along the borehole, is assumed to give the correct temperature profile and results in the best estimate of the mean temperature of the ground. A good estimate is also obtained by circulating a heat carrier through the borehole heat exchanger pipes while measuring the flow temperature at a short time interval (10 seconds). The calculated temperature profile is used for deriving a mean temperature of the borehole. Heat is added to the fluid by friction heat caused by the pump work, which results in an overestimation of the borehole temperature. This influencer becomes significant after 20 minutes of pumping.

Place, publisher, year, edition, pages
2003. Vol. 109, 151-156 p.
Research subject
Water Resources Engineering
URN: urn:nbn:se:ltu:diva-40540Local ID: fb775fe0-b884-11db-abff-000ea68e967bOAI: diva2:1014062
Winter meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers : 26/01/2003 - 29/01/2003
Validerad; 2003; 20070209 (ysko)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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