Thermal performance of the double-pass solar collector with and without porous media

Investigation of single and double pass solar air heater with transverse fins and a package wire mesh layer

“…El-Sebaii and Shalaby [4] recorded that the maximum difference between inlet and outlet air temperatures was about 28°C for upper channel at a 0.0223 kg/s flow rate and 580 W/m 2 solar intensity. It has been also suggested to insert an absorbing plate into a panel to have a double pass channel where the air flows from above and then below the absorber plate [13][14][15] or vice versa [16][17][18]. In general, the principle of using doubles pass or passing the flow from above and then from below is to increase the airflow path length inside collector.…”

“…The use of porous media tends to increase the surface per unit volume ratio substantially and was found to improve the thermal efficiency in the air solar heater [10]. [5,11,12,14,20,25,26] also use of porous media in constructed their SAH. While wire mesh screen was used as the porous material packed into the solar air collector to serve as the porous media by [8,10,19,22,27].…”

Theoretical and Experimental Study of a Double Air-Pass Solar Thermal Collector with an Insulating Rod of Millet

“…Various studies on their performance efficient than the finless absorber. The thermal efficiency of a double-pass solar collector with a porous medium is 60% to 70%, 20% to 30% higher than the collector without a porous medium [11]- [20]. Its efficiency is high compared to conventional solar collectors, it can exceed 75%.…”

Development of advanced solar assisted drying systems

“…The collector consist of two glass cover with addition of porous media under the second glass cover. Sopian et al [8] performed the experimental studies on the performance of a double-pass solar collector with porous media in the second or lower channel.…”