Effect of collector-absorber inclination angle on solar chimney power plants (SCPP): A computational fluid dynamics (CFD) modeling approach

Abstract

This study investigates the effect of the collector-absorber inclination angle on the efficiency of Solar Chimney Power Plants (SCPPs). Unlike traditional models, where only the roof is tilted, this research examines the impact of tilting both the collector and absorber using the Manzanares prototype. Three inclination angles (0°, 15°, and 30°) were analyzed through Computational Fluid Dynamics (CFD) simulations. The results show that the inclination angle significantly influences solar energy capture and convective effects, promoting the upward flow of hot air toward the chimney. A 15° inclination provides an optimal balance between energy absorption and minimizing kinetic energy losses due to non-uniform air layer thickness, a limitation in previous models. At 15°, the system achieves an air velocity greater than 18 m/s, compared to 15 m/s in the reference model. Tilting both the roof and ground at 15° ensures uniform air heating, enhancing buoyancy-driven flow and reducing kinetic energy losses. These findings emphasize the importance of considering the inclination of both the collector and absorber in SCPP design to enhance overall efficiency.