ABSTRACT

A detailed study on Solar Air Heaters (SAHs) with single-pass roughening with plastic net perforated multi-V and continuous multi-V ribs was investigated and compared for its effectiveness. Improvements in the Nusselt number ratio (Nu/Nus) and the friction factor ratio (f/fs) studied with the Reynolds number (Re) ranged from 2000–18000 for a relative roughness height (e/Dh) of 0.043, a relative roughness pitch (P/e) of 10, an aspect ratio (W/H) of 12, and an angle of attack (α) of 60°, maintaining a similar flow scenario. For a syntactically roughened channel with a perforated multi-V rib, the significant enhancement was recorded in thermo-hydraulic performance with a slight decrease in pumping power. The study was extended to analyze the effect of perforation in a double pass parallel flow SAH.

摘要

对具有塑料网穿孔多 V 和连续多 V 肋的单道粗化太阳能空气加热器 (SAH) 进行了详细研究，并比较了其有效性。使用雷诺数 (Re) 研究的努塞尔数比 (Nu/Nus) 和摩擦因数比 (f/fs) 的改进范围为 2000–18000，相对粗糙度高度 (e/Dh) 为 0.043，相对粗糙度间距 (P/e) 为 10，纵横比 (W/H) 为 12，攻角 (α) 为 60°，保持类似的流动场景。对于具有穿孔多 V 肋的句法粗糙通道，记录了热工水力性能的显着增强，而泵送功率略有下降。该研究扩展到分析穿孔在双通道平行流 SAH 中的影响。