The Solar Tower Chimney Geometry Impact on Its Performance
Résumé
In this study, the effect of the collector-chimney junction geometry on the performance of a Solar Chimney Power Plant (SCPP) is investigated using numerical simulations based on a two-dimensional axisymmetric model with the standard k-ε turbulence model, coupled with the Discrete Ordinates (DO) radiation model.An SCPP with a collector diameter of 3 m and a chimney height of 3 m is considered.Several junction configurations are analyzed by varying the junction inclination angle, arc radius, and fillet radius.The results show that the junction configuration with a collector inclination angle of 20 • and a fillet radius of 14 cm provides the best performance among the inclined cases, enhancing the mass flow rate by approximately 3.2% and increasing the power density by about 15% compared to the same inclination angle without a fillet.In addition, the configuration incorporating an 18 cm arc radius combined with a 14 cm fillet radius increases the mass flow rate by around 1.7% and improves the power density by approximately 7.5% compared to the corresponding arc configuration without a fillet Furthermore, a comparative analysis between configurations with and without a fillet radius reveals that the introduction of a fillet significantly improves the overall system performance, yielding increases of up to 8% in mass flow rate and about 5% in power density.These enhancements are attributed to smoother airflow transitions and more efficient inlet acceleration at the collector-chimney junction, leading primarily to improved aerodynamic performance of the solar chimney system.
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