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Comparing modelling predictions to experimental data for active magnetic regenerative refrigeration systems.

Author(s) : ENGELBRECHT K. L., NELLIS G. F., KLEIN S. A.

Summary

A one-dimensional transient numerical model that solves the governing energy equations for an active magnetic regenerative refrigerator (AMRR) has been developed. The governing equations are solved by starting from an initial temperature distribution and stepping the model forward in time until cyclic steady state is achieved; the results are to calculate cooling power and total input power to the system. The model has been verified numerically in the limit of a passive regenerator against an analytic solution and has been used to investigate various aspects of AMRR technology; for example, it has been used to predict the performance limits of practical AMRR systems and understand their transient and part-load characteristics. However, a rigorous experimental verification of the model has not yet been achieved. This paper describes initial efforts to validate the numerical model against experimental data from a prototype active magnetic regenerator. The predictions from the numerical model are compared to experimental active magnetic data collected at Astronautics Corporation of America using the rotary AMRR prototype described by Zimm et al. These data were collected at various operating conditions for a regenerator comprised of six beds of packed gadolinium spheres operating in the field of a 1.5 Tesla permanent. This paper presents initial comparisons to experimental data andpoints out where discrepancies between the model and experimental data might lead to future areas of research.

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Pages: 2007-1

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Details

  • Original title: Comparing modelling predictions to experimental data for active magnetic regenerative refrigeration systems.
  • Record ID : 2007-1564
  • Languages: English
  • Source: 2nd International Conference on Magnetic Refrigeration at Room Temperature
  • Publication date: 2007/04/11

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