Influential factors on thermal performance of energy slabs equipped with an insulation layer

Seokjae Lee, Sangwoo Park, Jongmuk Won, Hangseok Choi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The energy slab is a slab structure in a building that encases heat exchangers to utilize geothermal energy for heating and cooling of the building. In the energy slabs, the presence of thermal insulation layers is crucially important compared to those of the conventional Ground Heat Exchanger (GHEX). In this paper, a computational fluid dynamics (CFD) model was developed by calibrating with the result of the in-situ thermal performance test (TPT) to comprehensively assess the effect of influential factors on the thermal performance of energy slabs. Note that the thermal conductivity of ground formations and the flow rate of working fluid significantly influence the thermal performance of energy slabs. Especially in the energy slabs, the existence of a thermal insulation layer with appropriate thermal properties is significantly important to relieve the thermal interference induced by ambient air temperature. Considering the performance of thermal insulation and economic feasibility, a PF (phenol foam) board is found to be the suitable material for the energy slab considered in this paper.

Original languageEnglish
Pages (from-to)823-834
Number of pages12
JournalRenewable Energy
Publication statusPublished - 2021 Aug

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea grants ( 2020R1A6A1A03045059 and 2019R1A2C2086647 ) funded by the Korea government.

Publisher Copyright:
© 2021 Elsevier Ltd


  • Computational fluid-dynamic (CFD) model
  • Energy slab
  • Ground heat exchanger (GHEX)
  • Thermal insulation layer
  • Thermal performance test (TPT)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment


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