Numerical Validation of a New Analytical Solution for Helical (Earth-Basket) Type Ground Heat Exchangers

Christoph Reichl, Henk Witte

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we show that an analytical solution based on the Finite Line Source and G-function approach is both sufficiently fast and accurate for design calculations of ground heat exchangers with a complex (spiral) geometry. Detailed validations were performed for the steadystate and transient responses of analytical models with different time scales (10 h and 250 h). A comparison with a detailed computational fluid dynamics model (Ansys Fluent) and the analytical method for different boundary conditions showed a very good agreement (maximum root mean
square error) smaller than 0.25 K.
Original languageEnglish
Article number1418
Number of pages17
JournalMDPI Processes
Volume11
DOIs
Publication statusPublished - 8 May 2023

Research Field

  • Digitalisation and HVAC Technologies in Buildings

Keywords

  • shallow geothermal
  • spiral ground heat exchanger design
  • GHEX;
  • earth basket collector
  • computational fluid dynamics (CFD)
  • finite line source (FLS)
  • G-function
  • engineering tool

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