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  4. Improved Switchable Heat Pipe Based on Adsorption: Against-Gravity Operation and Enhanced Dynamics
 
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2024
Journal Article
Title

Improved Switchable Heat Pipe Based on Adsorption: Against-Gravity Operation and Enhanced Dynamics

Abstract
Controlling heat transfer through components with adjustable thermal resistance can be of great benefit in a wide range of applications such as the thermal management of spacecraft or electric vehicles. A novel concept for both thermal switching and thermal regulation is the use of a water-loaded adsorbent within a reservoir that a regular heat pipe is expanded with. By reversibly desorbing or adsorbing water, states of low and high thermal resistance can be achieved. This concept has been studied so far only in thermosiphons that rely on gravity support. To expand potential application fields, we successfully investigated the utilization of heat pipes with a capillary structure, achieving against-gravity operation. Adsorption-based heat pipe demonstrators were experimentally examined regarding their characteristic properties. Thermal resistances during the on and off state of 0.25 KW−1 and 6.5 KW−1, respectively, were measured, yielding switching ratios of up to 26. Furthermore, the role of the adsorbent reservoir heat exchanger was examined and found to have a significant potential to yield an improvement with regards to dynamic performance. With an improved demonstrator design, the dynamic performance was enhanced as the hysteresis behavior was reduced and a minimum switching time of 5 min was recorded.
Author(s)
Boda, Simon
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Winkler, Markus  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Schießl, Robert
KIT  
Teicht, Christian  orcid-logo
Fraunhofer-Institut für Chemische Technologie ICT  
Schwarz, Daniel  orcid-logo
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Schipper, Jan
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Bartholome, Kilian  orcid-logo
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Schäfer-Welsen, Olaf  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Pappert, Sandra  
Fraunhofer-Institut für Chemische Technologie ICT  
Journal
Energies  
Open Access
DOI
10.3390/en17092088
Language
English
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Fraunhofer-Institut für Chemische Technologie ICT  
Keyword(s)
  • Thermal management

  • Heat pipe

  • Adsoption

  • Thermal switch

  • Thermal regulator

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