Modeling of Trapezoidal Section Artificial Rough Solar Air Heater

Öz

Although solar air heaters are widely used, their heat transfer efficiency is low. A number of studies are being conducted on this subject. In this study, numerical modeling of a solar air heater with trapezoidal section artificial roughness was applied to increase heat transfer. The study was carried out at two different roughness rates; It was designed in two dimensions and realized with ANSYS Fluent, a common computational fluid dynamics software. By applying a constant heat flux of 1000 W/m2 on the absorber plate, turbulent flow was modeled with 10 different values between 4000 and 13000 Reynolds number. As a result of the study, an increase of 1.3 to 2.3 times in the Nusselt number was observed compared to the smooth surface. The maximum thermohydraulic performance parameter was obtained with a value of 1.55. It has also been emphasized that artificial roughness’s can be used to increase heat transfer.

Anahtar Kelimeler

• Air heater
• Trapezoidal section
• solar energy
• energy

Trapez Kesit Yapay Pürüzlü Güneş Destekli Hava Isıtıcının Modellenmesi

Öz

Güneş destekli hava ısıtıcıları yaygın olarak kullanılmasıyla birlikte, ısı transferi verimleri düşüktür. Bu konuda bir dizi araştırma yürütülmektedir. Bu çalışmada ısı transferini arttırmak için trapez kesit yapay pürüzlülük uygulanan güneş destekli hava ısıtıcısının sayısal modellemesi yapılmıştır. Çalışma iki farklı pürüzlülük oranında; iki boyutlu olarak tasarlanmış ve yaygın bir hesaplamalı akışkan dinamiği yazılımı olan ANSYS Fluent ile gerçekleştirilmiştir. Yutucu plaka üzerine 1000 W/m2 sabit ısı akısı uygulanarak 4000 ile 13000 Reynolds sayısı aralığında 10 farklı değer ile türbülanslı akış modellenmiştir. Çalışma sonucunda düz yüzeye göre Nusselt sayısında 1,3 ile 2,3 kat arasında artış gözlemlenmiştir. 1,55 değeri ile maksimum termohidrolik performans parametresi elde edilmiştir. Ayrıca yapay pürüzlülüklerin ısı transferini arttırmada kullanılabilir olduğu vurgulanmıştır.

Anahtar Kelimeler

• Hava ısıtıcı
• Trapez kesit
• güneş enerjisi
• enerji

Kaynakça

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