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Parametric investigation of helical ground heat exchangers for heat pump applications
Istanbul Technical University, Energy Institute.
Istanbul Technical University, Energy Institute.ORCID iD: 0000-0002-7431-5115
Istanbul Technical University, Energy Institute.
2016 (English)In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 127, p. 999-1007Article in journal (Refereed) Published
Abstract [en]

The installation cost and performance of ground source heat pump (GSHP) systems can greatly be affectedby application parameters of ground heat exchangers (GHEs). These parameters affecting the helical GHE’sperformance are their spacing, major diameter and pitch length. In large scale GSHP applications, morethan one GHE is needed. Therefore determining the distance between GHEs (spacing) becomes as animportant issue. In this work, the effect of distance between vertical helical GHEs on the heat transferrate (HTR) is studied. Performance of helical GHE is determined for different spacing and the properdistance is examined. Furthermore, the influences of the pitch length (Lp) as well as major diameter (D)of GHE on HTR value are numerically studied in COMSOL environment. The available experimental dataare used to validate the numerical results. Computational results show that they are in good agreementwith the experimental one. The proper distance between GHEs is suggested as 7 m and more. Furthermorethe results of the simulations prove that 100% changes in Lpand D can affect the performance of GHE onlyin order of 10% although the excavation cost increase more than 10%. The results provide useful guidancefor optimum design of vertical helical GHE for GSHP systems.

Place, publisher, year, edition, pages
2016. Vol. 127, p. 999-1007
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:uu:diva-380272OAI: oai:DiVA.org:uu-380272DiVA, id: diva2:1298994
Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25

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