Validation of borehole heat exchanger models against multi-flow rate thermal response tests

Research output: Contribution to journalArticle

Abstract

A recently developed vertical borehole ground heat exchanger model that accounts for transit time effects and time-varying short-circuiting heat transfer has been validated against two multi-flow-rate thermal response tests (MFR-TRT). The MFR-TRT, when performed with a wide range of flow rates, results in significant changes in the borehole thermal resistance, the borehole internal thermal resistance, and the short-circuiting heat transfer between the two legs of a single U-tube. The model accounts for short-circuiting by an analytically computed weighting factor that is used to determine the mean fluid temperature. The weighting factor portion of the model can be readily utilized in other ground heat exchanger models that currently rely on a simple mean fluid temperature. Use of the weighting factor is shown to give significantly better estimations of entering and exiting fluid temperature than using the simple mean fluid temperature. The new model is also compared to an alternative approach − using an effective borehole thermal resistance. While both the effective borehole thermal resistance model and the weighting factor give quite good results a few hours after a step change in flow rate, the weighting factor model gives much better results in the first few hours after a step change in flow rate.

Details

Authors
  • Richard A. Beier
  • Matt S. Mitchell
  • Jeffrey D. Spitler
  • Saqib Javed
External organisations
  • Oklahoma State University, Stillwater
  • Chalmers University of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geotechnical Engineering
  • Energy Engineering

Keywords

  • Borehole heat transfer, Borehole thermal resistance, Ground heat exchanger, Ground-source heat pump, Thermal response test
Original languageEnglish
Pages (from-to)55-68
Number of pages14
JournalGeothermics
Volume71
Publication statusPublished - 2018 Jan 1
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes