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The way the sun’s heat can be used is easy to examine. When the south side of a building is warmed by the sun it tends to aid space heating of the interior in winter or can cause overheating in summer. If different materials or mechanisms are used to facilitate the absorption of this heat it can be transferred from the outer building surfaces to the interior more efficiently or stored until needed.
In a passive system the building materials serve for both collecting and storage. They trap the sun's heat and transmit it to interior space using natural forces such as gravity and convection. When there is no sun, the heat stored by the materials is reradiated and warms the building. A strictly passive system would use only sun and wind energy to transmit this heat, but in practice many passive systems use fans to move air or motors to operate insulation panels, making the passive system more effective, Mashburn said.
Active systems work the same said Mashburn, but the components are designed to function more efficiently with the addition of mechanical equipment such as pumps and valves to facilitate heat distribution and storage.
In a solar collector, a lightabsorbent material is covered by glass or plastic to
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