Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity

This study describes an experimental investigation of the thermal efficiency stainless steel mesh and wool as a porous medium in lower channel double pass solar air heater. An setup was planned developed. Various types media with high conductivity different porosities have been tested. The effects porosity wire mesh, media, mass flow rate, intensity radiation studied. Experimental results show that using is greater than without media. When used medium, reached 79.82 percent while it can be achieved 76. by material. reduction increasing efficiency. multi-pass collector when 6, 12.6 and31.7percent higher at 98.75, 97.5, 96.25percent. While increase 8.1 28.5 97.875 95.75