Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Modeling and validation of solidification of pcm around a vertical bare tube
Submission Author:
Claudia Rosa do Espirito Santo Nobrega , MA , Brazil
Co-Authors:
Claudia Rosa do Espirito Santo Nobrega, Kamal Ismail
Presenter: Claudia Rosa do Espirito Santo Nobrega
doi://10.26678/ABCM.ENCIT2018.CIT18-0392
Abstract
Renewable energy systems are usually intermittent and needs some means of accumulating and keeping the energy when available to be used when needed with minimum of losses and in adequate rate for the process. There are three basic means for thermal energy storage; sensible heat storage, latent heat storage and hybrid thermal energy storage. Latent heat thermal energy storage system is the most preferred method due to its high thermal capacity, the small mass and the fact that the processes of charging and discharging can be realized under isothermal conditions. In the present a model is proposed to represent the solidification process along a vertical tube of constant surface temperature (or constant heat flux) submersed in a PCM in the liquid phase model. The mathematical model of the phase change process over the surface of the vertical tube is based on pure conduction, the finite volume technique and the enthalpy approach. A home-built numerical code is constructed, optimized and validated against experimental results showing reasonably good agreement.
Keywords
energy storage, latent heat, vertical tube, phase change, PCM, Interface velocity, solidified mass fraction
