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A method to evaluate thermal response tests on groundwater-filled boreholes

Saqib Javed (Institutionen för energi och miljö, Installationsteknik) ; Helena Nakos ; Johan Claesson (Institutionen för bygg- och miljöteknik, Byggnadsteknologi)
ASHRAE Transactions (0001-2505). Vol. 118 (2012), 1, p. 540-549.
[Artikel, refereegranskad vetenskaplig]

The design of borehole heat exchangers for ground source heat pump system applications requires thermal properties, like ground thermal conductivity and borehole thermal resistance, as inputs. These properties are often determined from an in-situ thermal response test of a pilot borehole. For groundwater-filled boreholes, the ground thermal conductivity and borehole resistance estimations are affected by the heat-injection rates used during the test. Most existing methods for evaluating thermal response tests were not originally developed to analyze tests on groundwater-filled boreholes, and these methods can sometimes give erroneous results in such situations. This paper presents a new method for the evaluation of thermal response tests on grouted and groundwater-filled boreholes. The method is based on an analytical solution, which considers the thermal capacities, thermal resistances, and thermal properties of all borehole elements. The proposed method simplifies the evaluation of thermal response tests on groundwater-filled boreholes and provides accurate estimations of ground thermal conductivity and borehole thermal resistance.



Denna post skapades 2012-09-20. Senast ändrad 2014-09-02.
CPL Pubid: 163647

 

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Institutioner (Chalmers)

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

Ämnesområden

Samhällsbyggnadsteknik

Chalmers infrastruktur