Numerical Simulation of a Shallow Geothermal Heating/Cooling System
Name
Geocongress2014-zymnis-whittle.pdf
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1.62 MB
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Adobe PDF
Checksum (MD5)
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Author(s)
Zymnis, Despina Maria
Whittle, Andrew
Date Issued
February 2014
Journal
Geo-Congress 2014 Technical Papers
Publisher
American Society of Civil Engineers (ASCE)
Citation
Zymnis, Despina M., and Whittle, Andrew J. “Numerical Simulation of a Shallow Geothermal Heating/Cooling System.” Geo-Congress 2014 Technical Papers February 23-26 2014, Atlanta, Georgia, USA, edited by Murad Abu-Farsakh, American Society of Civil Engineers (ASCE), February 2014
Version
Author's final manuscript
Abstract
In recent years, sustainability concerns have played an increasingly important role in building design, leading to rapid adoption of shallow geothermal heating/cooling systems. Understanding the heat exchange with the ground and associated thermo-hydro-mechanical processes involved is critical to ensure safe, efficient long-term performance of these geothermal systems. The current study considers heating/cooling loads for a large office building in Chicago, based on recommendations for typical DOE Commercial Benchmark Buildings and solves the coupled thermo-hydro-mechanical response of different soil types using the Code_Bright program. The paper considers a closed-loop system comprising an array of 80 m deep vertical heat exchangers that operates on a seasonal cycle with zero net heat transfer to the ground and can supply a heating load up to 2440 kW. Using estimated thermal properties of the Chicago clays, the THM analyses show negligible drift in the temperature within the surrounding ground for long-term operation of the geothermal system. However, when thermo-elastoplastic properties are considered, the analyses show that thermal cycling induces long-term settlements of the building.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1061/9780784413272.267
