Passive solar heating system
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Passive solar heating system : A solar space heating can consist of a passive system, an active system or combination of both. Passive systems are typically less costly and less complex than active system. Passive solar space heating takes advantage of warmth from the sun through design features such as large south facing windows and materials in the floors or walls that absorb warmth during the day. A sunspace or greenhouse is a good example of passive system for solar space heating The south facing thick wall called trombe wall is made of concrete, adobe, stone or composite of bricks, blocks and sand designed for thermal storage. in order to increase the absorption the outer surface is painted black. The entire south wall is covered by one or two sheets of glass or plastic sheet with some air gap between the wall and inner glazing. Solar radiation after penetration through the glazing is absorbed by the thermal storage wall. The air in the air gap glazing and the wall thus gets heated, rises up and enters the room through the upper vent while cool air from the room replaces it from the bottom went. The circulation of air continues till the wall goes on heating. Thus wall collect, stores and transfers the heat to the room. Heating can be adjusted by controlling the airflow through the inlet and outlet vents by shutters. With help of damper at the top of glazing allows the excess heat to outside when heating is not required