Effect of forced thermal recharging on the thermal behaviour of a field scale geothermal energy pile

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Many applications require ground source heat pumps coupled with energy piles to operate for a given number of hours per day. During the times when the heat pumps are switched off, the ground temperatures normally recover naturally. The ground can be forcefully recharged during the rest periods using solar heaters or cooling towers combined with energy piles. The effect of solar thermal recharging on energy extracted, ground and pile temperatures, and pile thermal strains and stresses are presented in this paper. Forced ground thermal recovery is experimentally investigated and included for 8 hours operation with 16 hours heating and 16 hours operation with 8 hours heating. The longer recharge duration gives higher benefits in terms of energy extracted and ground temperature recoveries with larger thermal loads on the pile. The pile temperatures, thermal strains and stresses undergo cyclic response for both operating modes.

Original languageEnglish
Title of host publicationEnergy Geotechnics
Subtitle of host publicationProceedings of the 1st International Conference on Energy Geotechnics, ICEGT 2016
EditorsFrank Wuttke, Sebastian Bauer, Marcelo Sánchez
Place of PublicationBoca Rotan
PublisherCRC Press
Number of pages12
ISBN (Electronic)9781315315232
ISBN (Print)9781138032996
Publication statusPublished - 2016
EventInternational Conference on Energy Geotechnics (ICEGT 2016) - Kiel, Germany
Duration: 29 Aug 201631 Aug 2016
Conference number: 1st


ConferenceInternational Conference on Energy Geotechnics (ICEGT 2016)
Abbreviated titleICEGT 2016

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