Normally the sun`s energy would heat
the absorber surface, then heat the surrounding air. This hot air would circulate then transfer heat to the glass surface
and be lost. In the Seido evacuated tube, there is essentially no air and therefore no convection. Almost all the heat generated
is usable, even in very cold, windy or cloudy conditions. When the absorber surface reaches its maximum stagnation temperature
of 477F, the glass tube is safe to touch and handle.
The absorber selective surface itself is contained entirely
within the evacuated space, unlike many other evacuated tube designs. The selective surface will never gather dust or oxidize
and will look and perform like new for many years. The vacuum is warrantied for 10 years and is expected to last much longer.
The thick borosilicate glass is designed and tested to withstand hail up to 1.38 inches.
The days of hauling heavy
and awkward collectors to the roof are over. Each individual tube is light and can be safely carried to the roof and assembled
by one person. The same is true for the header and other components.
Customers appreciate the modern high
tech look of evacuated tubes. Their high performance allows a small footprint on the roof. Additionally, the round tube is
well suited to gathering diffuse radiation which often allows a visually pleasing flush mount, even on non-south roof pitches.