Thermal behavior in a solar air heater channel roughened with delta-shaped vortex generators

Despite the various techniques used in strengthening the Solar Air Heater (SAH) through extended surfaces (obstacles) on the absorber plate, its thermal performance remains far from the optimal rate. Accordingly, an experimental study has been conducted to improve the SAH thermal performance. The technique consists in investigating the heat transfer, friction factor and thermal enhancement factor of flow in a rectangular channel artificially...