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Calculation and Adjustment of the Activation Temperature of Switchable Heat Pipes Based on Adsorption

Author

Listed:
  • Christian Teicht

    (Fraunhofer Institute for Chemical Technology ICT, Joseph-von-Fraunhofer Strasse 7, 76327 Pfinztal, Germany)

  • Markus Winkler

    (Fraunhofer Institute for Physical Measurement Techniques IPM, Georges-Koehler-Allee 301, 79110 Freiburg, Germany)

  • Simon Boda

    (Fraunhofer Institute for Physical Measurement Techniques IPM, Georges-Koehler-Allee 301, 79110 Freiburg, Germany)

  • Daniel Schwarz

    (Fraunhofer Institute for Physical Measurement Techniques IPM, Georges-Koehler-Allee 301, 79110 Freiburg, Germany)

  • Jan Schipper

    (Fraunhofer Institute for Physical Measurement Techniques IPM, Georges-Koehler-Allee 301, 79110 Freiburg, Germany)

  • Angelos Polyzoidis

    (Fraunhofer Institute for Chemical Technology ICT, Joseph-von-Fraunhofer Strasse 7, 76327 Pfinztal, Germany)

  • Sandra Pappert

    (Fraunhofer Institute for Chemical Technology ICT, Joseph-von-Fraunhofer Strasse 7, 76327 Pfinztal, Germany)

  • Kilian Bartholomé

    (Fraunhofer Institute for Physical Measurement Techniques IPM, Georges-Koehler-Allee 301, 79110 Freiburg, Germany)

Abstract

Recently, thermal regulators based on adsorption in a heat pipe have been proposed. The advantage of these so-called “switchpipes” over similar approaches is their low on state thermal resistance. In this paper, we propose a methodology to calculate and adjust the activation temperature of such switchpipes. For this purpose, we use a mass balance-based model that considers both the heat transfer properties of the heat pipe itself, which depend on the amount of working fluid, and the adsorption equilibrium of the adsorbent used. This model can be used not only to describe the activation behavior of a given heat pipe but also to optimize the configuration of a heat pipe for specific operating conditions and to select appropriate adsorbents. In this paper, we also propose definitions for basic indicators of the activation properties of the heat pipe, such as the activation temperature and the activation temperature span. Finally, a simplified calculation method is presented that allows the selection of the correct adsorbent among all adsorbents with Type IV and Type V adsorption isotherms.

Suggested Citation

  • Christian Teicht & Markus Winkler & Simon Boda & Daniel Schwarz & Jan Schipper & Angelos Polyzoidis & Sandra Pappert & Kilian Bartholomé, 2024. "Calculation and Adjustment of the Activation Temperature of Switchable Heat Pipes Based on Adsorption," Energies, MDPI, vol. 17(17), pages 1-21, August.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:17:p:4314-:d:1466227
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