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Experimental evaluation of commercial heat exchangers for use as PCM thermal storage systems

Author

Listed:
  • Medrano, M.
  • Yilmaz, M.O.
  • Nogués, M.
  • Martorell, I.
  • Roca, Joan
  • Cabeza, Luisa F.

Abstract

Phase change materials (PCM) possess a great capacity of accumulation of energy in their temperature of fusion thanks to the latent heat. These materials are used in applications where it is necessary to store energy due to the temporary phase shift between the offer and demand of thermal energy. Thus, possible applications are the solar systems as well as the recovery of residual heat for its posterior use in other processes. In spite of this great potential, the practical feasibility of latent heat storage with PCM is still limited, mainly due to a rather low thermal conductivity. This low conductivity implies small heat transfer coefficients and, consequently, thermal cycles are slow and not suitable for most of the potential applications. This work investigates experimentally the heat transfer process during melting (charge) and solidification (discharge) of five small heat exchangers working as latent heat thermal storage systems. Commercial paraffin RT35 is used as PCM filling one side of the heat exchanger and water circulates through the other side as heat transfer fluid. Average thermal power values are evaluated for various operating conditions and compared among the heat exchangers studied. When the comparison is done for average power per unit area and per average temperature gradient, results show that the double pipe heat exchanger with the PCM embedded in a graphite matrix (DPHX-PCM matrix) is the one with higher values, in the range of 700-800Â W/m2-K, which are one order of magnitude higher than the ones presented by the second best. On the other hand, the compact heat exchanger (CompHX-PCM) is by large the one with the highest average thermal power (above 1Â kW), as it has the highest ratio of heat transfer area to external volume.

Suggested Citation

  • Medrano, M. & Yilmaz, M.O. & Nogués, M. & Martorell, I. & Roca, Joan & Cabeza, Luisa F., 2009. "Experimental evaluation of commercial heat exchangers for use as PCM thermal storage systems," Applied Energy, Elsevier, vol. 86(10), pages 2047-2055, October.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:10:p:2047-2055
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    References listed on IDEAS

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    1. Zhou, Guobing & Yang, Yongping & Wang, Xin & Zhou, Shaoxiang, 2009. "Numerical analysis of effect of shape-stabilized phase change material plates in a building combined with night ventilation," Applied Energy, Elsevier, vol. 86(1), pages 52-59, January.
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    4. Zhou, Guobing & Zhang, Yinping & Zhang, Qunli & Lin, Kunping & Di, Hongfa, 2007. "Performance of a hybrid heating system with thermal storage using shape-stabilized phase-change material plates," Applied Energy, Elsevier, vol. 84(10), pages 1068-1077, October.
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