Experimental validation of a short-term Borehole-to-Ground (B2G) dynamic model
2015 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 140, 210-223 p.Article in journal (Refereed) Published
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.
Ground source heat pump, Borehole heat exchanger, Heating and cooling systems, Dynamic modeling
IdentifiersURN: urn:nbn:se:kth:diva-162954DOI: 10.1016/j.apenergy.2014.12.002ISI: 000349875900020ScopusID: 2-s2.0-84918785461OAI: oai:DiVA.org:kth-162954DiVA: diva2:800063
FunderEU, FP7, Seventh Framework Programme
QC 201504012015-04-012015-03-262015-04-01Bibliographically approved