International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Improvement of the T-history Method to Measure Heat of Fusion for Phase Change Materials

  • Published : 2003.03.01
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Abstract

Though conventional calorimetry methods such as differential scanning calorimetry and differential thermal analysis are used generally in measuring heat of fusion, T-history method has advantages of a simple experimental apparatus and no requirements of sampling process, which is particularly useful for measuring thermophyical properties of in-homogeneous phase change materials in sealed tubes. However, the degree of supercooling used in selecting a range of latent heat release and neglecting sensible heat during the phase change process can cause significant errors in determining the heat of fusion. In the present study, it was shown that a 40% discrepancy exists between the original T-history and the present methods when analyzing the same experimental data. As a result, a reasonable modification to the original T-history method is proposed.

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References

  1. Sohn, K. and Hong, H., 2000, Improvement on thermal property of sodium surfate decahydrate for latent heat storage materials, Proceedings of the SAREK 2000 Winter annual conference
  2. Park, W. H, 1989, A System Development of Thermal Energy Storage at High Temperatures, KIST
  3. Kim, S. D., 1992, Heat Transfer Characteristics in Latent Heat Storage Systems Using Salt Hydrates, KIST
  4. Zhang, Y. and Jiang, Y., 1999, A simple method, the T-history method, of determining the heat of fusion, specific heat and thermal conductivity of phase-change materials, Measurement and Science Techology, Vol. 10, pp. 201-205
  5. Incropera, F. P. and Dewitt, D. P., 1996, Fudamentals of Heat and Mass Transfer, 4th ed., Wiley, New York, pp. 212-217
  6. Lane, G. A., 1986, Solar Energy Storage: Latent Heat Materials, Vol. II: Technology, CRC press, Florida, pp. 79-90
  7. Ulman, A. and Valentin, B., 1983, Investigations of sodium acetate trihydrate for solar latent heat storage, controlling the melting point, Solar Energy Materials, 9, pp.177-181