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

Améliorations des échangeurs de chaleur à tube en U enterrés. Mémoire de Maîtrise.

Auteurs : ACUÑA J.

Type de monographie : Thèse

Résumé

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.

Détails

  • Titre original : Improvements of U-pipe borehole heat exchangers. Licentiate thesis.
  • Identifiant de la fiche : 30000672
  • Langues : Anglais
  • Édition : Kth (royal institute of technology) - Suède/Suède
  • Date d'édition : 2010
  • ISSN : 11020245
  • ISBN : 9789174156607