Solar Thermal Systems
Solar thermal units or solar collectors are the most widely used type of
solar power. In a basic unit, there is an insulated panel or box with a
glass or plastic cover and a dark absorbing plate. As the sunlight
passes in through the glass, the absorber plate heats up and the heat is
transferred to a fluid (for example, a water or oil). The fluid is
pumped around the building, spreading the heat. In Japan
and China, solar thermal units are widely used. In Tokyo alone, there are nearly 2 million buildings with solar
water heaters.
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