Thermal Performance Assessment for The Solar Air Collector Integrated with Ribs Turbulators under Nassiriya City Climate
Khudheyer S. Mushatet, Nabaa M. Bader
Mechanical Engineering Department College of Engineering, Thi-Qar University, Nassiriya.
Corresponding Author Email: [email protected]
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Analysis of heat transfer characteristics in a solar air collector was performed experimentally by using parallel ribs of different angles of attack. The ribs are perpendicular to the main flow direction. The aim of the present investigate is to determine the angle of attack that produces the best heat transmission and thermal performance in a heated duct. The rib height-to-duct height ratio (e/H) was maintained at 0.6 throughout the study. the pitch- ratio (P/e) was 10. For inclined ribs, the angles of attack (α) were altered from 30° to 90° and evaluated at a constant mass flow rate (MFR) of 0.022 kg/s, solar irradiance varied from (330 to 850) W/m2. The hot outlet air temperature for the rib with an angle of attack (α =30°,45°, and 60°) was improved up to about 8%,14%, and 17% respectively, higher than the rib with a 90°. According to the thermal performance comparison, the rib inclined 60° provided higher Nusselt number spanning the most area when compared to the other cases.