Experimental evaluation of IDA ICE and COMSOL models for an asymmetric borehole thermal energy storage field in Nordic climate

Tianchen Xue*, Juha Jokisalo, Risto Kosonen, Mika Vuolle, Federica Marongiu, Sami Vallin, Nina Leppäharju, Teppo Arola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
170 Downloads (Pure)

Abstract

Appropriate modeling of borehole thermal energy storage (BTES) system is crucial for accurate prediction of BTES-coupled ground source heat pump performance with accessible computational load. This study aims to validate 3-D numerical models developed in IDA ICE 4.8 and COMSOL for a large-scale asymmetric borehole field consisting of 74 groundwater-filled boreholes with average depth of 310 m in Otaniemi, Finland. Comparisons were conducted between the detailed-geometry IDA ICE and COMSOL borehole field models and between the detailed-geometry and simplified-geometry IDA ICE borehole field models. All these models were validated by 1.5-years brine temperatures measured by temperature sensors and a distributed temperature sensing monitoring system. The results show the detailed-geometry IDA ICE model can estimate the BTES inlet and outlet brine temperatures as well as the COMSOL model. The average inlet and outlet brine temperature differences against the measurement data in the detailed-geometry IDA ICE and COMSOL models were both within 1 ℃. The simplified-geometry IDA ICE models can predict the borehole field inlet and outlet brine temperatures with a similar high accuracy (within 1 ℃ against the measurement) and can reduce the computational time by 72 % less than the detailed-geometry IDA ICE model.

Original languageEnglish
Article number119261
Number of pages15
JournalApplied Thermal Engineering
Volume217
DOIs
Publication statusPublished - 25 Nov 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Borehole field
  • Borehole modeling
  • DTS measurement
  • Geothermal energy

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  • FinEst Twins: FinEst Twins

    Nieminen, M.

    01/12/201930/11/2026

    Project: EU: Framework programmes funding

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