Source: EPA
Photo Source: Unsplash, Boba
An evacuated tube solar collector on a roof.
Evacuated tube collectors feature thin, copper tubes filled with a fluid, such as water, housed inside larger vacuum-sealed clear glass or plastic tubes.
Evacuated tubes use the sun’s energy more efficiently and can produce higher temperatures than flat-plate collectors for a few reasons. First, the tube design increases the surface area available to the sun, efficiently absorbing direct sunlight from many different angles. Second, the tubes also have a partial vacuum within the clear glass enclosure, which significantly reduces heat loss to the outside environment.
Evacuated tube systems are typically more expensive than flat-plate collectors, but they are more efficient and can produce higher temperatures. Evacuated tubes can reliably produce very hot water for batch or on-demand water heating and for many industrial processes, and they can produce enough heat to handle almost any space heating or space cooling application.
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