Wavy collector design for high-efficiency solar chimney power plants

Abstract

This study presents a computational investigation into the aerodynamic and thermal performance enhancement of a solar chimney power plant (SCPP) through the integration of wavy geometries along the collector roof. Various wavy configurations, defined by different curvature ratios (Rc/λ = 0.5 to 2.5), and wave peak amplitude (A = 0.5R to 1.5R) were assessed and compared against a conventional straight collector design. This study utilizes Computational Fluid Dynamics (CFD) simulations based on the RANS equations to predict flow behavior, pressure distribution, temperature gradients, and air velocity profiles. Mesh independence test and model validations against experimental data were conducted to ensure numerical accuracy. Results indicate that specific wavy designs, particularly at Rc/λ = 1.5 and A = R, significantly improve airflow rate, reduce pressure at the chimney inlet, and enhance temperature gain, thereby boosting the overall driving force of the system. The study concludes that incorporating optimized wavy geometries offers a promising passive strategy for improving SCPP efficiency, supporting future designs of sustainable energy systems.