The sun is the most powerful heat generator with which neither of the heat sources created by mankind can compete. Annually, the
solar energy obtained by earth is 15000 as much as the power industry of the whole world can produce. It means that only a tiny
part of solar energy is used for the sake of mankind.
Solar air collectors are the key component of active solar-heating systems. They gather the sun's energy, transform its radiation
into heat, and then transfer that heat into a fluid (regularly water or air). The solar thermal energy can be used in solar waterheating systems, solar pool heaters, and solar space-heating system.
