Share

IIR document

Recovery times after thermal response tests on vertical borehole heat exchangers.

Number: pap. ID: 499

Author(s) : JAVED S., CLAESSON J., BEIER R. A.

Summary

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.

Available documents

Format PDF

Pages: 8 p.

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Recovery times after thermal response tests on vertical borehole heat exchangers.
  • Record ID : 30003218
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

Links


See other articles from the proceedings (569)
See the conference proceedings

Indexing