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Improvements of U-pipe borehole heat exchangers. Licentiate thesis.

Author(s) : ACUÑA J.

Type of monograph: Doctoral thesis

Summary

There are approximately 360 000 systems installed in Sweden with a growing rate of about 30 000 installations per year. The most common way to exchange heat with the bedrock in ground source heat pump applications is circulating a secondary fluid through a borehole heat exchanger, a closed loop in a vertical borehole. The fluid transports the heat from the ground to a certain heating and/or cooling application. A fluid with one degree higher or lower temperature coming out from the borehole may represent a 2-3% change in the COP of a heat pump system. This licentiate thesis presents the analysis of several groundwater filled borehole heat exchangers, including standard and alternative U-pipe configurations (e.g. with spacers, grooves), as well as two coaxial designs. It embraces measurements of borehole deviation, ground-water flow, undisturbed ground temperature profile, secondary fluid and groundwater temperature variations.

Details

  • Original title: Improvements of U-pipe borehole heat exchangers. Licentiate thesis.
  • Record ID : 30000672
  • Languages: English
  • Publication: KTH (Royal Institute of Technology) - Sweden/Sweden
  • Publication date: 2010
  • ISSN: 11020245
  • ISBN: 9789174156607

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