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A novel numerical model  for the thermal response of borehole heat exchangers fields
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-5093-9070
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-3490-1777
2014 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The design of a borehole field should be based on a long-term simulation of its thermal response for specified energy loads. This response can be calculated from a pre-calculated dimensionless function, the g-function. This paper is focused on a new approach to the calculation of g-functions; in particular with a precise representation of the boundary conditions at the borehole wall. First, the almost constant temperature along the borehole heat exchanger requires a boundary condition of essentially isothermal boreholes along the depth. In a common case the borehole heat exchangers are connected in parallel, thus all boreholes should have the same temperature. Also, the total heat flow to the borehole field should be constant over time. A numerical model in which the boreholes are filled with a highly conductive material has been built, reproducing the isothermal condition. By thermally interconnecting the boreholes, the equal temperature condition is satisfied. The g-functions of some simple borehole field configurations are presented in this paper. The results show, in general, a good agreement with the existing solutions for a similar boundary condition.

Place, publisher, year, edition, pages
2014. 1-10 p.
Keyword [en]
borehole, heat exchanger, g-function, long-term performance, uniform borehole temperature
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-145882OAI: oai:DiVA.org:kth-145882DiVA: diva2:720839
Conference
The 11th International Energy Agency Heat Pump Conference,Montreal, May 12-16, 2014
Note

QC 20140619

Available from: 2014-06-02 Created: 2014-06-02 Last updated: 2016-11-30Bibliographically approved

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Monzó, PatriciaAcuña, José

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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