Thermal Response Test (TRT) State-of-the art 2011: IEA ECES ANNEX 21
2011 (English)Report (Refereed)
Proper design of ground heat exchangers in ground source heat pump systemsrequires a good estimate of the thermal conductivity of the ground to avoid oversizing or under-sizing of the ground heat exchanger. A good estimate of thethermal conductivity is also needed when designing a BTES (Borehole ThermalEnergy Storage) system. The ground thermal properties may be measured at aspecific location (in situ) using what is usually referred to as a thermal responsetest (TRT). In such tests, a heat injection or extraction (often at constant rate) isimposed on a test borehole. The resulting temperature response is used todetermine the ground thermal conductivity, and to test the performance ofboreholes. Since the initial mobile test rigs were built in 1995 in Sweden and theU.S.A., this technology has spread to an increasing number of countries.Within the framework of the International Energy Agency (IEA), and theImplementing Agreement on Energy Storage through Energy Conservation(ECES), the overall objectives of the international co-operation project Annex 21“Thermal Response Test” were to compile TRT experiences worldwide in order to identify problems; carry out further development; disseminate gained knowledge; promote the technology.Current report is the result of the work within the Annex 21 Subtask 1 and gives a summary of known thermal response testing activities in the world and the state-of-the-art of the technology until December 2011.
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2011. , 40 p.
Research subject Water Resources Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-25055Local ID: d9912198-c418-4650-a8e4-3fbfc3c722d6OAI: oai:DiVA.org:ltu-25055DiVA: diva2:998107
Godkänd; 2011; Bibliografisk uppgift: This report is part of the final report of IEA ECES ANNEX 21 on Thermal Response Test (TRT), November 2013. http://www.iea-eces.org/annexes/completed-annexes/annex-21.html ; 20150122 (bon)2016-09-292016-09-29Bibliographically approved