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  4. Method to characterize a thermal diode in saturated steam atmosphere
 
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2020
Journal Article
Title

Method to characterize a thermal diode in saturated steam atmosphere

Abstract
We present a novel measurement method for the characterization of thermal diodes in a saturated steam atmosphere. A measuring setup has been developed in which two pressure sensors are integrated. Using a developed analytical model, the heat flow, the volume flow, and the cracking pressure are determined from the measured absolute pressures and the pressure difference. The analytical model was verified using a flow through an orifice. We first calculated the volume flow through the orifice, with a diameter of 3 mm, using the Reader-Harris equation and then compared it to experimentally determined values. The experimentally determined values showed a discrepancy of 9%. With the measurement setup, we have characterized a check valve developed for magnetocaloric heat pumps, which has a thermally rectifying behavior. The developed check valve consists of three spring arms, which are radially attached to a valve disk. The heat flow through the check valve in the forward direction is 166 W for water, 239 W for ethanol, and 547 W for methanol at a temperature difference of 1 K. In the reverse direction, the heat flow is −0.03 W at a temperature difference of −1 K. For methanol, this corresponds to a rectification coefficient of more than 18 000.
Author(s)
Maier, Lena Maria
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Hess, Tobias
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Kaube, Alexandra
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Corhan, Patrick  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Fitger, Andreas  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Bachmann, Nora  
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
Review of scientific instruments  
Project(s)
MagMed
Funder
Bundesministerium für Wirtschaft und Energie BMWi (Deutschland)  
File(s)
Download (1.94 MB)
Rights
Use according to copyright law
DOI
10.24406/publica-r-262990
10.1063/5.0006602
Language
English
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Keyword(s)
  • Thermal Diode

  • measuring method

  • Heatpipes

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