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<p class=MsoNormal>Glazed collectors: i.e. <o:p></o:p></p>
<p class=MsoNormal>evacuated tubes and flat plate collectors – the single
one factor that effects the collectors efficiency is most is the Angle of Incidence
of sunlight to the flat glass or curved glass cylinders. Typically in the best
low iron glass at perfect orientation to the sun – only 90% of the
sunlight gets through the glass while at least 10% gets reflected off the
surface. No matter how efficient the absorber is in capturing the solar thermal
energy – if only 90% get through - then 90% insolation x 90% efficiency
means at a theoretically best is 81% efficient collector under optimal
conditions. Evacuated tubes have an obvious distinct disadvantage to a flat
surface – as the plane rotates away from the south. On east or west
facing roofs, the back side of the tube curvature will typically be greater
than a 40 degree angle of incidence from September 21<sup>st</sup> to March 21<sup>st</sup>
above 40 degrees latitude. Rotating the absorber in the tube will not change
the angle of incidence to the glass. In the summertime above 40 degree latitude
the morning and/or afternoon sun will be north of a south facing
absorber in the glass tube. IT IS IMPOSSIBLE for a tubular surface that
covers the same area TO CAPTURE AS MUCH SUNLIGHT AS A FLAT SURFACE - as
much of the surface on one side will always be curved AWAY from the sun.
Even at direct 0 orientation at solar noon to a flat plate or evacuated tube
facing south only the 10 o’clock to 2 o’ clock position on a tube
is in excellent orientation to the sun. TOTAL NONSENSE IS TUBULAR PEOPLE
CLAIMING THE TUBES TRACK THE SUN! Please take a geometry class! PLEASE NOTE
THIS IS TRUE FOR SOLAR ELECTRIC OR SOLAR THERMAL COLLECTORS THE ANGLE OF
INCIDENCE TO THE GLASS IS CRITICAL. NOTE TO FOLLOW – IT IS ILLEGAL TO TO
PUT ANNEALED GLASS ON A ROOF. Only tempered glass can legally be put on a roof.
Gator tom<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Tom Lane<o:p></o:p></p>
<p class=MsoNormal>Energy Conservation Services<o:p></o:p></p>
<p class=MsoNormal>6120 SW 13th ST, Gainesville, FL 32608<o:p></o:p></p>
<p class=MsoNormal>(352) 377-8866 F (352) 338-0056<o:p></o:p></p>
<p class=MsoNormal><a href="http://www.ecs-solar.com/">Give Your Sun A Job</a><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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