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Experimental validation of a short-term Borehole-to-Ground (B2G) dynamic model
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-3490-1777
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2015 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 140, 210-223 p.Article in journal (Refereed) Published
Abstract [en]

The design and optimization of ground source heat pump systems require the ability to accurately reproduce the dynamic thermal behavior of the system on a short-term basis, specially in a system control perspective. In this context, modeling borehole heat exchangers (BHEs) is one of the most relevant and difficult tasks. Developing a model that is able to accurately reproduce the instantaneous response of a BHE while keeping a good agreement on a long-term basis is not straightforward. Thus, decoupling the short-term and long-term behavior will ease the design of a fast short-term focused model. This work presents a short-term BHE dynamic model, called Borehole-to-Ground (B2G), which is based on the thermal network approach, combined with a vertical discretization of the borehole. The proposed model has been validated against experimental data from a real borehole located in Stockholm, Sweden. Validation results prove the ability of the model to reproduce the short-term behavior of the borehole with an accurate prediction of the outlet fluid temperature, as well as the internal temperature profile along the U-tube.

Place, publisher, year, edition, pages
2015. Vol. 140, 210-223 p.
Keyword [en]
Ground source heat pump, Borehole heat exchanger, Heating and cooling systems, Dynamic modeling
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-162954DOI: 10.1016/j.apenergy.2014.12.002ISI: 000349875900020ScopusID: 2-s2.0-84918785461OAI: diva2:800063
EU, FP7, Seventh Framework Programme

QC 20150401

Available from: 2015-04-01 Created: 2015-03-26 Last updated: 2015-04-01Bibliographically approved

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Acuna, José
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