AN INVESTIGATION ON A SOLAR CHIMNEY MODEL | ||||
| Journal of Al-Azhar University Engineering Sector | ||||
| Article 19, Volume 14, Issue 51, April 2019, Page 485-494 PDF (545.22 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/auej.2019.33353 | ||||
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| Authors | ||||
| El-Adel A Elkady; Mohamed A Halawa; Mostafa Mohamed; Mohamed A Younes | ||||
| Mechanical Engineering Department, Al-Azhar University | ||||
| Abstract | ||||
| A solar chimney system (SCS) is a solar thermal power plant utilizing a combination of solar air collector and central updraft tube to generate a solar induced convective flow which drives pressure staged turbines to generate electricity. In the present work, an experimental set-up model at the mechanical engineering department of Al-Azhar University was erected. Two geometrical parameters (chimney height, H and collector inlet height, h) have been investigated. The model collector radius, R is fixed at 1 m. The chimney diameter, d is fixed at 0.2 m and its height, H was varied from 2 m to 4 m. The collector inlet height, h was varied from 0.04 m to 0.08 m. Air velocity and temperature variation with time at chimney inlet have been measured as well as in canopy. The results show that the collector inlet height, h of 0.04 m and the chimney height, H of 4 m providing an optimum configuration for the constructed solar chimney model. The velocity and temperature profiles in the chimney was modeled by CFD analysis based on the same model dimensions. The CFD simulation was compared with the experimental data of the solar chimney model and a good agreement is noticed. محطات توليد الطاقة باستخدام المدخنة الشمسية فيھا تستخدم الطاقة الشمسية في تسخين الھواء داخل المجمع مما يحدث فرق في درجات الحرارة بين داخل المدخنة وخارجھا فينتج عنھ فرق في الضغط يستخدم في تشغيل تربينات ھوائية لانتاج الکھرباء. الأبعاد الھندسية الخاصة بالمحطة تعتبر من اھم العوامل المؤثرة علي أداء المحطة. تم عمل دراسة معملية علي نموذج للمدخنة الشمسية تم إنشاؤه بقسم الھندسة الميکانيکية بجامعة الازھر. تم إجراء القياسات المطلوبة ورسم منحنيات تغير السرعة ودرجات الحرارة مع الزمن. تم عمل محاکاة للنموذج وتم عمل مقارنة بين القياسات المعملية وقياسات نموذج المحاکاة فوجد بينھم توافق جيد. | ||||
| Keywords | ||||
| Solar Chimney; Canopy; Greenhouse effect; Wind Turbines | ||||
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