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Indirect Gain SolarIndirect gain solar energy systems use a thermal mass between the sun and the living space. This thermal mass absorbs the sunlight and transfers it to the living space by conduction. Conduction is the way heat moves through materials, traveling from molecule to molecule.
Trombe WallsA Trombe wall is the most common type of systems. This is a wall that is similar to a giant flat plate collector. The wall is usually 8 to 16 inches thick of dark colored masonry on the sun side of the house. A single or double layer of glass (glazing?) is mounted about 1 inch or less in front of the wall’s surface.
Solar heat is absorbed by the walls dark-colored outside surface and stored in the wall’s mass, where it radiates into the living space. Vents are located at the top and bottom of a Trombe wall to allow heat to convect from between the wall and the glass into the living space. At night the vents are closed and and radiant heat from the wall heats the living space.Roof Pond systems
Roof Pond SystemA Roof pond system usually consists of six to twelve inches of water contained on a flat roof. Water can also be stored in large plastic or fiberglass containers covered by glazing and the space below is warmed by radiant heat from the warm water above. In the daytime when the sun is shining the water in the "pond" heats up. At night insulation is moved over the "pond" and the heated water radiates to the space below heating the room.
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