Analysis of the effect of perforation in multi-v rib artificial roughened single pass solar air heater:-Part A

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 (alpha) of 60 degrees, 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.

Automated summary

This study investigated the effects of structural improvements on the thermo-hydraulic performance of Solar Air Heaters (SAHs), and compared the effectiveness of different structures. The results showed that using multi-V ribs for syntactic roughening can significantly enhance the thermo-hydraulic performance with a slight decrease in pumping power.