Abstract
This paper studies the control of radiation on double-pass solar air heaters with porous media in the lower channel. The intensity of radiations was controlled in two ways potentiometer and mobile via the Bluetooth by designing, building, and implementing a light control system which consists of a power supply, transformer, two Arduino microcontroller (which programmed with C++ language), bridge rectifier, resistances, two optocouplers, TRAIC, Bluetooth model, toggle switch and LCD Display. The results showed the inverse relationship between the solar radiation and the resistance, the maximum solar radiation obtained from this work reached 786 W/m2 when the resistance is 1.15 kΩ, while the minimum solar radiation is 158.6 W/m2 when the resistance is 6.21 kΩ. The output power increases with increasing solar radiation, which means the maximum output power reaches 2567 W at the maximum solar radiation.
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