(271c) Modeling and Numerical Simulation of Concentrated Solar EnergyStorage and utilization using Packed and Fluidized bed Systems

In this study a radiative heat transfer model is developed and a computational fluid dynamics (CFD) approach is used to simulate concentrated solar energy (CSE) absorption and energy recovery using both packed and bubbling fluidized beds containing silicon carbide (SiC) particles. Radiative heat transfer plays a very important role when the temperature is high, such as the temperature of a medium upon receiving radiative CSE. In this work, the radiative heat transfer was modeled as an effective conductivity based on the Breitbach and Barthels study. For conductive heat transfer, heat is transferred by the contact area between particles and gas near the contact surface. Here, we used the Zehner-Bauer-Schlünder (ZBS) conductivity model to calculate the effective thermal conductivity. For fluidized bed filtered two fluid model (continuity, momentum, energy for gas and particle phases and granular temperature equation) was considered and simulated using ANSYS Fluent 16.1. The result of our two-dimensional simulation agreed well with the literature data on temperature measurements of SiC particles in a packed bed and in a bubbling fluidized bed.