Features of Solar Air Heat Collector 1.Working Principle of Solar air heat collector : Solar air heat collector is a device that heat the air with the solar radiation energy. And the working principle is as follow: cold air enters the device through the air inlet, then be heated circularly by heat collector, finally the hot air output is produced,the heat collector is fitted with heat receiver, heat insulator and driving device. 2.Basic Knowledge of Solar Air Heating System: Solar Air heating systems are supplemental heating systems that work in conjunction with, but independently of, your main heating system. The more hot air produced by the solar air heater, the less your primary heating system has to work -- and therefore the less fuel you have to buy. Solar air heating systems are different from most traditional heating systems in that the heating fuel is entirely free. You pay for fuel for as long as you use your boiler, stove, furnace, heat pump, etc.. With a solar air heating system, your initial (and only) investment is the air heater.. That's it. Your fuel-- sunshine-- is free.