Eventos Anais de eventos
CONEM 2022
XI Congresso Nacional de Engenharia Mecânica - CONEM 2022
Parametric analysis of the solidification process with nanoparticles in an energy storage unit with a parallel plate configuration
Submission Author:
James Gomes Pereira , PI
Co-Authors:
Antonio Bruno de Vasconcelos Leitão, James Gomes Pereira, Fátima Lino, Kamal Ismail
Presenter: Antonio Bruno de Vasconcelos Leitão
doi://10.26678/ABCM.CONEM2022.CON22-0690
Abstract
The energy storage in the phase change material is a well-accepted technology and is expanding in several engineering and building applications. In this study, a thermal model based on pure conduction to describe the solidification process in a parallel plate storage system is developed. For the solution of this model, the governing equations for the solid and liquid phases and the interface moving are discretized using the finite difference approximation and totally implicit approach with variable time step. The computational code representing the thermal model for the phase change process around the parallel plates was tested and validated against available numerical and experimental results, showing good agreement. As the temperature on the surface of the plate decreases, there is a reduction in the time to complete phase change and a higher solidification rate. However, increasing the distance between the plates contributes to a longer time for complete solidification. A promising method for improving these thermal storage units is the addition of nanoparticles in phase change materials. The inclusion of these nanoparticles increased the effective thermal conductivity of the mixture, contributing to the increase in the solidification rate. However, the effect of reducing latent heat due to the increase in mixture concentration values is too little to unbalance the enhanced thermal performance, such as reducing the time for the complete phase. The energy stored, interface position, interface velocity and the time for fully solidification are presented and discussed in terms of the temperature of the cold plate and the volumetric concentration of the nanoparticles in the phase change materials. The contribution of this study through the adopted model and solution method aims at a provisional way of obtaining an evaluation of this type of storage configuration and expanding its use in commercial applications and scientific research, in addition to predicting its thermal performance parameters quickly and accurately.
Keywords
Solidification, Parallel Plates, nano-phase change material
