Re: [EnergyPlus_Support] solar transmittance

["Wong, S L" <bclwong@xxxxxxxxxxxx>]

Achim,

Thanks a lot!
I've another question about "Shading Coefficient". The solar transmittance 
of 0.775 of a clear glass I found form the datasets of window glass. It 
indicates the shading coefficient of the clear glass is 0.95. As I know 
that 0.95 means there will be 95% of solar radiation entering into the 
space through the glazing, but why the solar transmittance of 0.775 is.

lee

At 12:51 PM 8/17/2004 +0200, you wrote:
>Hi,
>
>most probably your value is for normal incidence. In the simulation,
>solar radiation usually has an angle other than normal (smaller) for
>which transmittance is reduced (down to zero for parallel).
>
>Achim
>
>
> >>> bclwong@xxxxxxxxxxxx 08/17/04 12:49pm >>>
>Hi,
>
>I constructed a external wall with a window and without window
>shading device and window frame. The solar transmittance of the
>window glass is 0.775 (clear glass). But the simulated result of
>window system solar transmittance is 0.7. I wonder if someone can
>tell me why the difference was happened.
>
>lee
>
>
>
>
>
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