A model for latent heat energy storage systems

Abstract

SUMMARYIn this study, a theoretical approach is proposed for the prediction of time and temperature during the heat charge and discharge in the latent heat storage of phase changed materials (PCM). By the use of the average values of the mean specific heat capacities for the phase-changed materials, analytical solutions are obtained and compared with the available experimental data in the literature. It is shown that decreasing the entry temperature of the working fluid from À4 to À158C has a very dominant and strong effect on the PCM solidification time. The effect of the working fluid flow rate and the material of PCM capsules on the time for complete solidification and total charging is also investigated. The agreement between the present theoretical model results and the experimental data related to the cooling using small spheres and the heat storage using rectangle containers is very good. The largest difference between the present results and the experimental data becomes about 10% when the fluid temperature approaches the phase change temperature at high temperatures.

Phase change materials, their synthesis and application in textiles—a review

“…Phase change materials (PCMs) are able to absorb or release big amount of energy in latent heat (DH) form. The absorbing or releasing of latent heat energy occurs during solid to solid or solid to liquid phase transitions in a narrow range of temperature (Koca, Oztop, Koyun, & Varol, 2008;Sarier & Onder, 2007;Yuksel, Avci, & Kilic, 2006;Zhang & Wang, 2009). The use of PCMs among various thermal energy storage systems is highly acceptable because of their high heat of fusion, high density, and enabling a compact energy storage system at isothermal conditions Farid, Khudhair, Razack, & Al-Hallaj, 2004;Mondal, 2008;.…”

Investigation of heat transfer during melting of a PCM by a U-shaped heat source

“…Gadgil and Gobin [34] argued that, in such case, once the PCM started melting, the effects of conduction may be ignored in further heat transfer analysis. Yuksel et al [35] developed a theoretical model to predict the time and temperature during the charging and discharging of a PCM TES. They argued that the entry and average properties related to the system can be implemented in the analysis.…”

Dynamic simulation of air storage-based gas turbine plants

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