[Radiance-general] Representation of a solar sceen in radiance

[Christopher Rush]

If you use the “glass” material type, you would get varying reflection/transmission at certain angles based on Snell’s law, refractive index, critical angle, etc. – on both sides of the glass, which might not be representative of your system. You could consider one surface/layer to represent the glass (“glass” material type might be good enough approximation) and another layer to represent the screen (maybe “trans” material type unless you want to specify angular-dependent properties). If you want to combine the effect of glass with screen into one surface/layer then you probably need to consider something more complex if the different reflective properties on each side of the system are important. There are also more accurate ways to model glass if it has specific coatings, etc. that are important to the results.

-Chris


From: Per Haugaard [mailto:perhaugaard at yahoo.dk]
Sent: Wednesday, January 04, 2017 4:26 AM
To: Radiance Radiance
Subject: [Radiance-general] Representation of a solar sceen in radiance

Dear users,

Happy New Year.
I am looking for the best way to represent a gray semi transparent solar screen in radiance. Would it be to represent is as a sheet of glass with the total light transmissions or?
The screen is placed on the exterior side of the window and has a solartransmission of 6%, light transmission of 6% and an openness factor of 4%.The colour rendering index is 100.
The total light transmissions of the screen and glass is 4%.

Any input is appreciated.

Best regards
Per Haugaard

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