A Review: Numerical Simulation for Solar Chimney by Changing its Radius and Height

Abstract

Now a days Solar chimney power plant is a very good means of solar thermal electricity generating technology. According to common trends It can divided in three major parts. A large circular greenhouse, a tall cylindrical solar chimney in middle of green house and a set of turbines, around or in the solar chimney, geared to appropriate electric generators. CFD technology is widely used in this project to induce changes in kinetic flow energy caused by the variation of tower flow area with height. It was found that the tower area change result change in the efficiency and mass flow rate through the plant. Augmentations in kinetic energy is due to varied tower tops .the tower base significantly. Change in kinetic energy in tower is due to tower area ratio .Where as when we coclude about related type of tower, the velocity at the tower top increases but the mass flow rate decreases. While in the case of constant area of tower the kinetic power at the top remains the same. For the divergent case, maximum kinetic energy occurs at the tower base and this suggests the potential to extract more turbine power than the constant area tower.CFX is used to solve the numerical problem. It solve the conservation equation for mass, momentums and energy using finite volume method. Adaptive unstructured tetrahedral meshes were used in given study. The plants studied were modeled as an axis-symmetric model where the centerline of the tower is the axis of symmetry. To simulate axis-symmetry, a 1 degree section of the plant is cut out from the entire periphery.