Akademik Veri Yönetim Sistemi
VII-International European Conference on Interdisciplinary Scientific Research, Frankfurt, Almanya, 28 - 30 Mart 2023, ss.344-351
The sun ranks first among potentially renewable energy sources. Especially its different usage
areas and its appeal to wide geographies increase its attractiveness. This study focuses on
chimney design in solar chimney power plants, which is one of the solar energy systems. A
different approach to the performance of the Manzanares pilot plant is realized with the
divergent chimney design instead of the traditional cylindrical chimney with the 3D CFD
model. The effect on the system is evaluated by keeping the model chimney entrance area
constant, which is verified with a mesh-independent solution and experimental data, and the
divergence angle towards the chimney outlet is 0.5, 1, 1.5, 2, and 2.5°. Since the chimney is the
driving force of the system, it provides upward acceleration of the system air, whose kinetic
energy increases under the collector. It is seen that the maximum air flow rate, which was
14.223 m/s in the reference case where the divergent chimney structure contributed to this
situation, increased by 38.5% with the divergent chimney design and reached 19.7 m/s. It is
determined that the chimney divergence angle, which increases after 1.5°, which is the optimum
point for the chimney divergence angle, does not increase the power output of the system, on
the contrary, it decreases it. The power output, which was 53.6 kW in the reference case with a
cylindrical chimney, is predicted to increase by 170% at 1.5° chimney divergence and reach
146.824 kW. The same is true for the mean pressure difference at the turbine position. When
the divergence angle is made 1.5°, the mean pressure difference will increase by 95% and
reaches 208.083 Pa whereas it is only 106.623 Pa in the reference case.