Development and Validation of Analytical Solutions for Earth Basket (Spiral) Heat Exchangers

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Development and Validation of Analytical Solutions for Earth Basket (Spiral) Heat Exchangers

Conference paper presented in European Geothermal Congress 2022 held in Berlin, 17-21 October

Title: Development and Validation of Analytical Solutions for Earth Basket (Spiral) Heat Exchangers

Language: English

Authors: H.J.L. Witte (*1), F. A. Heinrichs (*2), C. Reichl (*2), C. Meeng (*1), C. Doerr (*2), A. Steurer (*2), S. Kling (*2)

*1: Groenholland Geo-energysystems BV
*2: AIT Austrian Institute of Technology

Abstract: In this paper we present an analytical solution and its validation for earth basket (vertical spiral) ground heat
exchangers. The model, based on the well known Finite Line Source Equation, accounts for the heat exchanger pipe diameter and seasonally varying near surface temperature. For computational efficiency the standard approach of using G-functions has been implemented as well. The analytical model is validated based on laboratory experiments and extensive CFD analysis.