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RECOVERY TIMES AFTER THERMAL RESPONSE TESTS ON VERTICAL BOREHOLE HEAT EXCHANGERS

Saqib Javed (Institutionen för energi och miljö, Installationsteknik) ; Johan Claesson (Institutionen för bygg- och miljöteknik, Byggnadsteknologi) ; Richard Beier
Proceedings of 23rd IIR International Congress of Refrigeration (ICR2011), Prague, Czech Republic. (2011)
[Konferensbidrag, refereegranskat]

The design of a ground source heat pump system requires accurate knowledge of properties, such as ground thermal conductivity and borehole thermal resistance. These properties are often determined using an in-situ thermal response test of a pilot borehole. These tests are sometimes interrupted by unexpected circumstances and occasionally a retest is required. For a retest to be conducted, the ground temperature must return to within 0.1-0.3 K of the initial undisturbed ground temperature. This paper addresses the issue of borehole retesting and reports on a systematic series of thermal response tests conducted to study the times needed for the ground temperature to return to within 0.3 K of the pre-test ground temperature. Tests were conducted using various heat injection rates and different time durations. Following a test, the development of ground temperature was studied for up to 2-3 months. A mathematical model was used to validate the experimentally measured ground temperatures and to extend the results to other testing conditions.



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Denna post skapades 2011-12-31. Senast ändrad 2014-09-02.
CPL Pubid: 151319

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Installationsteknik (2005-2014)
Institutionen för bygg- och miljöteknik, Byggnadsteknologi

Ämnesområden

Energi
Byggnadsteknik

Chalmers infrastruktur