The Kedco Evacuated Tubular Solar System has many advantages including: Work on overcast days
Cold Weather Evacuated tubes act like giant thermos,allowing 93% of the suns radiation in,but only 3 to 5% out Thermal conduction & convection losses are almost nothing (under 2%) because of the vacuum gap. This enables the system to work in very low temperatures. The constant profile of the round tube means that the collector is always perpendicular to the sun's rays and therefore the energy absorbed is approximately constant over the course of a day.
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