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Heat transfer coefficient in a packed sphere regenerator for use in active magnetic regenerative refrigeration.

Author(s) : FRISCHMANN M., ENGELBRECHT K., NELLIS G., et al.

Summary

Active magnetic regenerative refrigeration (AMRR) systems have emerged as a possible alternative to vapour compression refrigeration cycles. The University of Wisconsin has developed a one-dimensional numerical model of an AMRR system. The thermal interaction between the fluid and the bed material is captured using a correlation for the Nusselt number as a function of the Reynolds number and Prandtl number. The model is flexible with regard to the matrix configuration. However, experimental data are available for a regenerator composed of a packed bed of spheres. The observed discrepancy between the model results and these experimental data can be explained by deficiencies in the correlations that are available for flow through a packed bed of spheres. These correlations were developed primarily for low Prandtl number heat transfer fluids (i.e. gases) whereas the heat transfer fluid used in AMRR systems are liquids with relatively high Prandtl number. The available correlations from the literature are no self-consistent at high Prandtl number. Therefore, this paper presents the results of experiments with a single blow passive packed sphere regenerator that are used to measure the heat transfer coefficient with high Prandtl number fluids. These measurements are used to develop a new correlation for the Nusselt number in a bed of packed spheres that is accurate at high Prandtl number and therefore useful for modelling AMRR systems.

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Details

  • Original title: Heat transfer coefficient in a packed sphere regenerator for use in active magnetic regenerative refrigeration.
  • Record ID : 2009-1636
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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