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Thermal evaluation of coaxial deep borehole heat exchangers
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2016 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 97, 65-76 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents a performance study of deep borehole heat exchangers. The coaxial borehole heat exchanger (BHE) has been selected because for the present conditions it has a better performance than the conventional U-tube BHE. A numerical model has been developed to study the coaxial BHE. The model predictions are compared to detailed distributed temperature measurements obtained during a thermal response test. The model is found to accurately predict the behavior of a coaxial BHE. The influence of the flow direction of the mass flow is studied for BHE5 in the range 200 m-500 m. A parametric performance study is then carried out for the coaxial case with different borehole depths, flow rates and collector properties. The results clearly show a significant increase in the system performance with depth. In addition, it is shown that with increasing borehole depth, the heat load that can be sustained by the BHE is significantly increased. An overall performance chart for coaxial BHEs for the depths of 300-1000 m is presented. The chart can be used as a guide when sizing deep BHE installations.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 97, 65-76 p.
Keyword [en]
Borehole heat exchanger, Numerical, Coaxial, Ground source heat pump system
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:kth:diva-192379DOI: 10.1016/j.renene.2016.05.048ISI: 000380600500007ScopusID: 2-s2.0-84973279528OAI: oai:DiVA.org:kth-192379DiVA: diva2:969011
Funder
Swedish Energy Agency
Note

QC 20160913

Available from: 2016-09-13 Created: 2016-09-12 Last updated: 2016-09-13Bibliographically approved

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Acuna, José
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