A transpired collector reduces the load on a building’s heating system by heating intake air with solar energy. It preheats the ambient air by up to 40°F, reducing all or a portion of the load on a heating system during daylight hours. Although the transpired collector itself may not be able to achieve the required indoor air temperature on cloudy days or when the outside temperature plummets, it still provides useful energy and reduces utility bills.
The dark-coloured transpired collector is a large solar
collector, absorbing the solar energy striking it. The wall captures between
60% and 75% of the available solar energy, making it one of the most efficient solar
collectors designed to date. In addition to capturing direct solar radiation,
the transpired collector collects the indirect, scattered, and reflected
sunlight known as diffuse solar radiation. Typically, diffuse solar radiation,
which includes a portion of the radiation on clear days and all the radiation on
overcast days, makes up about 25% of the total annual radiation at the Earth’s surface.
The dark, corrugated metal sheets that make up the wall are
0.8-millimeter (mm)-thick and are typically manufactured from aluminium or galvanized
steel. The perforations through which the air flows are 1.6 mm in diameter and
are placed at regular intervals. The total percentage of the collector made up
of these holes is referred to as the collector porosity.
Transpired collector operation during the winter months.
Transpired collector operation during the
summer months.
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