Designs for the first three collector types are simple. The collectors usually weigh less than liquid-based collectors because they don't have pressurized piping. Another advantage of air-based collectors is that they don't have freezing or boiling problems. All four of these air-based collectors can be integrated into buildings and form part of a building's envelope.
The advantages of such a system over a water collector include the absence of problems associated with corrosion and with freezing and overheating. Also, air is a fast-reacting heat transfer medium and rock is a cheap storage medium for heat. Nevertheless, air collectors are not common due to the low heat storage capacity of air and rock. They are also difficult to regulate.
Related category• SOLAR ENERGY AND POWER
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