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Transient heat transfer in a coaxial borehole heat exchanger
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-3490-1777
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
2014 (English)In: Geothermics, ISSN 0375-6505, E-ISSN 1879-3576, Vol. 51, 470-482 p.Article in journal (Refereed) Published
Abstract [en]

Ground-source heat pumps often use vertical boreholes to exchange heat with the ground. A transient heat transfer model has been developed for a thermal response test on a pipe-in-pipe coaxial borehole heat exchanger. The analytical model calculates the vertical temperature profiles in the fluid flowing through the pipes, which are coupled to the surrounding grout and ground. The model is verified against measured vertical temperature profiles in the circulating fluid during a distributed thermal response test. The comparison with measured data indicates that the proposed model gives a more accurate estimate of the borehole thermal resistance than the conventional analytical model that uses a mean temperature approximation. The model demonstrates how strongly the shapes of the temperature profiles are dependent on the thermal resistance of the internal pipe wall and the flow direction.

Place, publisher, year, edition, pages
2014. Vol. 51, 470-482 p.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-147406DOI: 10.1016/j.geothermics.2014.02.006ISI: 000336778700040Scopus ID: 2-s2.0-84898905885OAI: oai:DiVA.org:kth-147406DiVA: diva2:731655
Funder
Swedish Energy Agency
Note

QC 20140702

Available from: 2014-07-02 Created: 2014-06-27 Last updated: 2017-12-05Bibliographically approved

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Acuña, JoséPalm, Björn

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