Experimental Investigation of Double Pass Solar Air Heater Using Multiple Aluminium Obstructions

Abstract

Solar air heaters are used for a variety of applications at average temperatures such as in drying of crop,
timber seasoning, and space heating. Various works have been carried out to increase the efficiency and heat transfer
rate of solar air heater. This includes using different absorber plate materials, artificial roughness geometry, surface
roughness, length and number of pass, mass flow rate, effect of porous material etc. Different types of absorber plates
had been made and experiments had been carried over it.