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  4. Modelling cascaded caloric refrigeration systems that are based on thermal diodes or switches
 
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2019
Journal Article
Title

Modelling cascaded caloric refrigeration systems that are based on thermal diodes or switches

Other Title
Modélisation de systèmes frigorifiques caloriques en cascade basés sur des diodes ou des interrupteurs thermiques
Abstract
Solid state cooling based on caloric materials has a large potential, because there is no need for fluid refrigerants. The state of the art system approach relies on a heat transfer fluid, which is pumped back and forth through a regenerator of caloric material. This system approach has fundamental limitations regarding the cycle frequency. Different system approaches are considered. One is the utilization of fast thermal diodes or switches. The aim of this work is to provide a universal model to describe a cooling system based on caloric materials using thermal diodes or switches. The heat capacitance of the caloric material is defined to be constant, allowing a lumped elements representation. An analytical model based on an analogy to an electrical low pass filter is introduced. The analytical model is compared with good agreement to lumped elements simulations and measurement data from the literature. It is shown, that the newly introduced cut-off frequency as merit for the potential cycle frequency is proportional to the heat transfer coefficient of the diodes/switches in flux direction and inverse proportional to the length scale of the caloric material in heat flux direction. Different heat transfer mechanisms are discussed as basis for such thermal diodes and switches in combination with different caloric effects. To increase the cycle frequency compared to state of the art systems, latent heat transfer is a promising candidate for all caloric effects, whereas for example a dry press contact for a magnetocaloric system presents many challenges.
Author(s)
Hess, Tobias
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Maier, Lena Maria
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Corhan, Patrick  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Schäfer-Welsen, Olaf  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Wöllenstein, Jürgen  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Bartholome, Kilian  orcid-logo
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Journal
International journal of refrigeration  
DOI
10.1016/j.ijrefrig.2019.04.013
Language
English
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Keyword(s)
  • Caloric Effect

  • Solid-State Refrigeration

  • Thermal Diode

  • Thermal Switch

  • Simulation

  • Lumped Elements Model

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