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Thermal performance analysis of multiple borehole heat exchangers
Istanbul Technical University, Energy Institute.
Istanbul Technical University, Energy Institute.
Istanbul Technical University, Energy Institute.ORCID iD: 0000-0002-7431-5115
2016 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 122, p. 544-551Article in journal (Refereed) Published
Abstract [en]

Effect of borehole spacing on Heat Transfer Rate per unit borehole length (unit HTR) is computationallyinvestigated for multiple Borehole Heat Exchangers (BHE). Experimentally verified computational modelis used to analyze different configurations consisting of various number of BHE. To determine the performanceloss due to mutual thermal interactions of BHE, the averaged unit HTR value of the most criticalborehole in each configuration is compared with that of a single borehole alone for various borehole spacingand operation durations of 1800 and 2400 h. Effect of thermal conductivity of ground on the relationbetween performance loss and borehole spacing is also examined. Furthermore, variations of total HTRvalues of a borehole field with borehole spacing are compared with each other for different configurations.It is seen that 4.5 m spacing is enough to keep the total performance losses less than 10% evenfor 2400 h non-stop operation. An analytical formulation is proposed for total HTR value which dependson thermal interaction coefficient (d) as well as spacing and number of BHE (N). Dependence of d on N isalso examined for different operation durations. Variations of dimensionless HTR value with boreholespacing are analyzed for different values of N. The results can be used during the engineering designstages of a BHE field to predict the variation of total HTR value of the field with borehole spacing andnumber of boreholes.

Place, publisher, year, edition, pages
2016. Vol. 122, p. 544-551
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:uu:diva-380273OAI: oai:DiVA.org:uu-380273DiVA, id: diva2:1298995
Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25

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