Rеvuе des Energies Renouvelables
Volume 19, Numéro 3, Pages 333-343
2016-09-30

Numerical Analysis Of A Latent Thermal Energy Storage Unit Using Two Phase Change Materials With Different Melting Temperatures



Authors : Benmoussa F. . Benmoussa H. . Benzaoui A. .

Abstract

This study presents a mathematical model based on the enthalpy method for the transient thermal behavior of a shell-and-tube latent thermal energy storage (LTES) unit using two kinds of phase change materials (PCMs) named PCM1 and PCM2, with different melting temperatures. Numerical simulations are carried out to investigate the effects of heat transfer fluid (HTF) inlet temperatures on the unsteady temperatures and melting fractions evolution of PCM1 and PCM2 as well as the unsteady total energy stored evolution in different zone of PCMs. Charging process was studied numerically under three different HTF inlet temperatures above the melting point of the PCMs. The results shows that melting rates of PCM2 are the fastest and that of PCM1 are the slowest, the PCM2 temperature and melting fraction evolution changes rapidly with time from the start of heating process passing through the phase change period to the end of charging process. It is also found that the total energy stored gradually increases from minimum value which define the beginning of the charging cycle to maximum value defined the end of the cycle. The maximum total energy stored is observed in PCM1 with high melting temperature and high latent heats of fusion. The effects of HTF inlet temperature on the total energy stored show that heat storage capacity is large when the temperature difference between the HTF inlet temperature and the melting point of PCMs is large.

Keywords

Latent thermal energy storage, Phase change materials, Storage rate, Energy stored, Numerical simulation, Enthalpy method.

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