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Design of a Laboratory BoreholeStorage model
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. (Ground-Source Heat Pump)ORCID iD: 0000-0002-9120-8637
INSA Lyon.
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.ORCID iD: 0000-0002-0550-2769
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2018 (English)In: Research Conference Proceedings / [ed] Jeffrey Spitler, José Acuña, Michel Bernier, Zhaohong Fang, Signhild Gehlin, Saqib Javed, Björn Palm, Simon J. Rees, 2018, p. 400-410Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the design process of a 4x4 Laboratory Borehole Storage (LABS) model through analytical and numerical analyses. This LABS isintended to generate reference Thermal Response Functions (TRFs) as well as to be a validation tool for borehole heat transfer models. The objective of thisdesign process is to determine suitable geometrical and physical parameters for the LABS. An analytical scaling analysis is first performed and importantscaling constraints are derived. In particular, it is shown that the downscaling process leads to significantly higher values for Neumann and convectiveboundary conditions whereas the Fourier number is invariant. A numerical model is then used to verify the scaling laws, determine the size of the LABS,as well as to evaluate the influence of top surface convection and borehole radius on generated TRFs. An adequate shape for the LABS is found to be aquarter cylinder of radius and height 1.0 m, weighing around 1.2 tonnes. Natural convection on the top boundary proves to have a significant effect on thegenerated TRF with deviations of at least 15%. This convection effect is proposed as an explanation for the difference observed between experimental andanalytical results in Cimmino and Bernier (2015). A numerical reproduction of their test leads to a relative difference of 1.1% at the last reported time.As small borehole radii are challenging to reproduce in a LABS, the effect of the borehole radius on TRFs is investigated. It is found that Eskilson’sradius correction (1987) is not fully satisfactory and a new correction method must be undertaken.

Place, publisher, year, edition, pages
2018. p. 400-410
Keywords [en]
Laboratory model, Borehole storage, Downscaling, Thermal response function, Experiment design
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-238595OAI: oai:DiVA.org:kth-238595DiVA, id: diva2:1260778
Conference
International Ground-Source Heat Pump Association Research Conference 2018
Projects
Deep boreholes for Ground-Source Heat Pumps
Funder
Swedish Energy Agency
Note

QC 20181106

Available from: 2018-11-05 Created: 2018-11-05 Last updated: 2018-11-06Bibliographically approved

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Design lab-scale borehole(526 kB)59 downloads
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Mazzotti, WillemMonzó, PatriciaLazzarotto, AlbertoAcuña, JoséPalm, Björn

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CiteExportLink to record
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