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Thermal characteristics of a direct heat exchange system between granules with a phase-change material and air.

Author(s) : NAGANO K., TAKEDA S., MOCHIDA T., et al.

Type of article: Article

Summary

The authors have proposed a system of direct heat exchange between granules including phase change material (PCM) and air. The PCM granules consist of granulated porous media with particle diameters and paraffin wax. At first, column experiments were performed with a packed bed of PCM granules. Temperature variations in the PCM packed bed were measured. It was demonstrated that the heat exchange flux between the PCM granules and air can be kept high and continuous during phase change. Secondly, a computer simulation model was developed using an assumption that the temperature of the PCM granules is the same as that of passing air throughout the packed bed. It was found that the phase-change period calculated by the model is in agreement with the measured one. Finally, the heat transfer coefficient during phase change and the time required for phase change to be completed in the system are discussed using numerical analysis.

Details

  • Original title: Thermal characteristics of a direct heat exchange system between granules with a phase-change material and air.
  • Record ID : 2005-0621
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 24 - n. 14-15
  • Publication date: 2004/10

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