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Fundamentals of the Thermal Analysis of Complex Arrangements of Underground Heat Sources

Author

Listed:
  • Heiner Brakelmann

    (Faculty for Engineering Sciences, Institute for Energy-Transport and Storage (ETS), and Head of BCC Cable Consulting, University of Duisburg-Essen, D47495 Rheinberg, Germany)

  • George J. Anders

    (Faculty of Electrotechnics, Electronics and Automation, Lodz University of Technology, 90-924 Lodz, Poland)

  • Piotr Zajac

    (Faculty of Electrotechnics, Electronics and Automation, Lodz University of Technology, 90-924 Lodz, Poland)

Abstract

This paper introduces a new analytical method for the 3-dimensional analysis of heat sources installed underground. Such sources include primarily electric power cables and steam pipes in urban areas. For complex arrangements of the heat sources, the heat transfer and cable rating calculations require the application of numerical methods, which call for high level of expertise and are generally difficult to use. The computational algorithm presented in this paper uses a point sources approach and is an extension of the work published by the authors based on line source modeling, with the goal of simplifying the numerical calculations. The proposed approach is applicable for all heat sources, which are directly buried in a uniform or a partially dried out soil. The method is illustrated by several numerical examples. These examples are used for comparison with the existing standard approach.

Suggested Citation

  • Heiner Brakelmann & George J. Anders & Piotr Zajac, 2021. "Fundamentals of the Thermal Analysis of Complex Arrangements of Underground Heat Sources," Energies, MDPI, vol. 14(20), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6813-:d:659226
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    References listed on IDEAS

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    1. Lei You & Jian Wang & Gang Liu & Hui Ma & Ming Zheng, 2018. "Thermal Rating of Offshore Wind Farm Cables Installed in Ventilated J-Tubes," Energies, MDPI, vol. 11(3), pages 1-14, March.
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