Performance Characteristics of Solar Air Heater with Surface Mounted Obstacles
The performance of conventional solar air heaters(SAHs)can be improved by providing obstacles on the heated wall(i.e.on the absorber plate).Experiments have been performed to collect heat transfer and flow-friction data from an air heater duct with delta-shaped obstacles mounted on the absorber surface and having an aspect ratio 6:1 resembling the conditions close to the solar air heaters.This study encompassed for the range of Reynolds number(Re)from 2,100 – 30,000,relative obstacle height(e/H)from 0.25 to 0.75,relative obstacle longitudinal pitch(P1/e)From 3/2 to 11/2,relative obstacle transverse pitch(Pt/b)from 1 to 7/3 and the angle of incidence varied from 30° to 90°.The thermo-hydraulic performance characteristics of SAH have been compared with the previous published works and the optimum range of the geometries have been explored for the better performance of such air-heaters compared to the other designs of solar air heaters.
Friction factor Heat transfer Obstacle Solar air heater Thermo-hydraulic performance
Adisu Bekele Manish Mishra Sushanta Dutta
Department of Mechanical and Vehicle Engineering,Adama Science and Technology University,Adama,Ethio Department of Mechanical and Industrial Engineering,Indian Institute of Technology Roorkee,Roorkee-2
国际会议
桂林
英文
1-14
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）