Nanoparticles Enhanced Pcms With Different Melting Temperatures In Thermal Energy Storage System
Hiba A. Hasan*
Computer Techniques Engineering Dept., Al-Turath University College, Baghdad, Iraq
Corresponding Author Email: [email protected], [email protected],
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The use of a Thermal Energy Storage (TES) consisting of several Phase Change Materials (PCMs) with different melting temperatures, increases the temperature difference between the PCMs and the Heat Transfer Fluid (HTF) and improves the heat transfer between them, thus improving the performance of the TES. Two models of TES were used in the present study, the first consisted of three PCMs with different melting temperatures and the second consisted of only one PCM. In order to enhance the low conductivity of the PCMs, Al2O3 nanoparticles were used with different concentrations (1%, 4%, 7%, and 10%) for both models. The results showed that, the first model improved heat transfer compared to the second model, and the presence of nanoparticles made the melting process faster compared to pure PCMs and increasing the concentration of nanoparticles speeds up the melting process even more. The highest enhancement was achieved with the highest used concentration of (10%), where the improvement in the thermal conductivity and the reduction in melting time was (33% and 10%) respectively. The nanoparticles also led to a decrease in the outlet HTF temperature in melting process.