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1D Models of an Active Magnetic Regeneration cycle for Cryogenic Applications
  • Theodoros Diamantopoulos,
  • Tommaso Matteuzzi,
  • Rasmus Bjørk
Theodoros Diamantopoulos
Department of Energy Conversion and Storage, Technical University of Denmark -DTU
Tommaso Matteuzzi
Department of Energy Conversion and Storage, Technical University of Denmark -DTU
Rasmus Bjørk
Department of Energy Conversion and Storage, Technical University of Denmark -DTU

Corresponding Author:[email protected]

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Abstract

In investigation of an active magnetic regenerator (AMR) cycle operating at room temperatures, 1D models have been extensively used to accurately computing its performance metrics. However, extending these models to simulate an AMR cycle at cryogenic temperatures introduces inherent complexities and challenges. The broad temperature span and low operating temperatures required for cryogenic applications, such as hydrogen liquefaction, lead to significant density variations of the working fluid within the AMR that cannot be overlooked. In this work, two 1D AMR models assuming a compressible working fluid operating at cryogenic temperatures are demonstrated which address the large density variations and the numerical stiffness of the equations. The models exhibit good agreement with experimental and 2D numerical results of an AMR configuration designed for hydrogen liquefaction. A comparative study is conducted between the developed models and an incompressible AMR model at cryogenic temperatures, highlighting the impact of assuming an incompressible fluid on the performance metrics.
04 Jun 2024Submitted to TechRxiv
07 Jun 2024Published in TechRxiv