Effect of nanoparticle shape factor and snowflake crystal structure on discharging acceleration LHTESS containing (Al2O3 - GO) HNEPCM

摘要

In this paper, a numerical investigation is performed on solidification procedure of Hybrid Nanoparticles Enhanced Phase Change Material (HNEPCM) in a Latent Heat Thermal Energy Storage System (LHTESS) with snowflake crystal structure. The application of such system is balancing the energy store and requirement. Dispersion of Al2O3 - Go hybrid nanoparticles into water as PCM is regarded, due to its weak thermal conductivity. Further, in order to expedite the solidification procedure, thermal radiation effect is considered as a heat source in the energy equation. The unsteady equations which govern the heat and mass transfer during the procedure are solved numerically using Standard Galerkin Finite Element Method (SGFEM). A comparison between the Full Solidification Time (FST) and the total energy of pure PCM and HNEPCM is carried out. Roles of hybrid nanoparticles characteristics including the volume fraction and shape factor on solidification rate are also reported. Results indicated that considering hybrid nanoparticles with the volume fraction of 0.04 can expedite the solidification procedure by an increment of 24.1% in solidification rate. (C) 2019 Elsevier B.V. All rights reserved.