Hybrid Car – More Fun with Less Gas

tinted vs clear glass for solar collector? - Page 2

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Posted by Ron Purvis on April 1, 2006, 7:55 pm
 
There are millions of greenhouses and they do operate very well due to this
effect. Please think before posting.



Posted by Rob Dekker on April 3, 2006, 6:54 am
 


You want to use clear class.
The effect that the car stays cool works against you for a solar panel.
You want as much heat as you can to accumulate.

More accurately :
The sun transmits energy in the entire visible spectrum (and some more in UV)
and with a solar collector you want to capture as much of that light as you can.
Thus : clean glass, and a pitch-black collector.

Even more sophisticated :
Of course, you also want to prevent as much heat to leave the collector as
possible.
A hot collector would transmit IR light if it is pitch-black, so sophisticated
collectors
are coated with 'black-chrome' or another material that reflects (and thus does
not transmit) IR light.
The loss of not capturing the sun's IR light is outweighted by reduction of
transmission
of IR light due to the black-chrome coating.

You could also think of applying a IR blocking coating on the glass, which will
further reduce
loss of IR energy due to a hot collector. But by all means, keep the glass
crystal clear in the
visible and UV spectrum.

Rob



Posted by Rick on April 3, 2006, 3:36 pm
 Thanks to all who posted I guess seeing that most manufactured panels
have a dark coating(to block IR ) I was surmising there were advantages
to having a tinted glass. There is but the tinting must trap IR. Thanks
Again  Rick


Posted by SJC on April 3, 2006, 5:04 pm
 

  The glazing is clear, what you might be seeing as tinting is the black
collector inside.

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