CIESC Journal ›› 2012, Vol. 63 ›› Issue (S2): 14-20.doi: 10.3969/j.issn.0438-1157.2012.z2.003

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Heat transfer characteristics of shell-tube latent thermal energy storage system

ZHANG Peng1, XIAO Xin1, WANG Ruzhu1, LI Ming2   

  1. 1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;
    2. Solar Energy Research Institute, Yunnan Normal University, Kunming 650092, Yunnan, China
  • Received:2012-09-18 Revised:2012-09-25 Online:2012-12-28 Published:2012-12-28
  • Supported by:

    supported by the Key Project of National Natural Science Foundation of China (U1137605) and the Innovation Program for Graduate Student of Shanghai Jiao Tong University(Z-020-026).

Abstract: The charging and discharging characteristics of a latent thermal energy storage(LTES)system using pure paraffin and composite paraffin/expanded graphite(EG)PCMs were experimentally investigated.The results showed that the thermal conductivity of the composite PCM was distinctly enhanced,whereas natural convection was hampered because the paraffin was confined in the porous structure of the EG.The time-durations of the charging and discharging processes with different flow rates for heat storage/retrieval were discussed.The time-duration of composite PCM during the discharging process was reduced more than that during the charging process,and the charging and discharging rates could be improved significantly with the higher flow rate.The charging process of the LTES system was numerically investigated with enthalpy method,which was verified by the experimental results.

Key words: latent thermal energy storage, composite phase change materials, thermal characteristics, numerical calculation

CLC Number: 

  • TK02

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