Parametric Analysis of Geometric Configurations of a Small-Scale Solar Chimney

Silva, Janaína de Oliveira Castro; Hanriot, Sérgio de Morais; Maia, Cristiana Brasil

doi:10.4028/www.scientific.net/amr.1051.975

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…The mass flow rate obtained for the reference geometry was lower than the optimized geometry. This behaviour was already expected, because when the collector diameter and the tower height increase, the mass flow rate also increases, as seen in the literature [17,22,57,58].…”

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confidence: 76%

Optimization of a Small Solar Chimney

Silva

Maia

2020

Acta Polytech

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An optimization study to maximize the exergy efficiency of a small-scale solar chimney was carried out. Optimization variables include collector diameter (Dc), collector height (Hc), tower height (Ht), and tower diameter (Dt). Models from the literature were used to predict environmental and airflow parameters. Exergy efficiency and solar chimney efficiency were determined, on an hourly basis, for a one-year period. The model was simulated using the EES software. Two methods of optimization were used, the method of conjugate directions and the method of variable metric, both providing similar results. Results were compared to the results from an experimental prototype, and it was found that the energetic and exergetic efficiency were significantly improved. The analysis indicated that the height and diameter of the chimney and collector are the most important physical variables in the design of a solar chimney. For both methods, it was found that the maximum exergy efficiency was obtained with a collector height of 0.5 m, a collector diameter of 30 m, a tower diameter of 1 m, and a tower height of 17.8 – 18.8 m. The exergy efficiency was 44 %.

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Section: No /supporting

confidence: 76%

Optimization of a Small Solar Chimney

Silva

Maia

2020

Acta Polytech

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A review on solar chimney systems

Kasaeian

Molana

Rahmani

et al. 2017

Renewable and Sustainable Energy Reviews

143

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The increased utilization of solar energy has gained the attention of researchers to develop the solar chimney (SC) technology in recent years. Many studies have been conducted in this aear both experimentally and theoretically, whereas experimental studies are mainly focused on small-scale systems. This work provides a comprehensive and updated review that include most of the experimental studies, analytical and simulation works, the solar chimney applications, hybrid systems and geographical case studies based on extended references, citation of the updated works and the specified way of looking at different sections. The technological gaps in differnet sections are identified and a summary of suggestions is given for the future work, including more experimental works on the large-scale systems, and CFD analyses for optimization between the geometrical parameters and the output power. More studies on new applications of solar chimney technology including hybrid systems are also recommended.

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