Pahud, Daniel and Matthey, Bernard (2001) Comparison of the thermal performance of double U-pipe borehole heat exchangers measured in situ. Energy and Buildings, 33 (5). pp. 503-507. ISSN 0378-7788
Full text not available from this repository. (Request a copy)Abstract
A borehole heat exchanger is a ground heat exchanger devised for the extraction or injection of thermal energy from/into the ground. The thermal performance of a borehole heat exchanger can be assessed with a response test. The response test method allows the in situ determination of the thermal conductivity of the ground in the vicinity of a borehole heat exchanger, as well as the effective thermal resistance of this latter. The response test method is briefly described before it is applied to several designs of double U-pipe borehole heat exchangers. The tests have shown the viability of the method. They reveal that the thermal resistance can be decreased by 30% when quartz sand is used instead of bentonite and when spacers are used to keep the plastic pipes in contact with the borehole wall. With a common heat extraction rate of 50 W/m of borehole length, the temperature gain in a heat pump evaporator is +2 K. Finally, a mobile device has been developed to offer the possibility of accomplishing a response test.
Item Type: | Scientific journal article, Newspaper article or Magazine article |
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Uncontrolled Keywords: | Thermal response test, Thermal performance, Heat exchanger; Borehole |
Subjects: | Physical sciences > Geology > Applied geology > Engineering geology Engineering > Civil engineering > Environmental engineering > Energy resources |
Department/unit: | Dipartimento ambiente costruzioni e design > Istituto sostenibilità applicata all'ambiente costruito |
Depositing User: | Daniel Pahud |
Date Deposited: | 15 Apr 2013 09:33 |
Last Modified: | 15 Apr 2013 09:33 |
URI: | http://repository.supsi.ch/id/eprint/2341 |
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