External 'clear' shading and light shelves

Dear Radiance users,

I thank you very much for your reply to my prior posted question on external shading (glass).
I do have one questions on the trans material. Since I do not have any data on the transmitted specularity Ts, it then proper to use 0,5 for a two sheet laminated glazing with 60% or 70% printing or???

Another question. Which material is proper to use for light shelves (e.g. MDF with a reflectance of 95%)?

Best regards

Per Haugaard

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______________________

Per Haugaard,
Griffenfeldsgade 33, 2.tv
2200 København N
Denmark

mobil: +45 26 39 06 40
E-mail: [email protected]

----- Original meddelelse -----
Fra: Greg Ward <[email protected]>
Til: [email protected]
Sendt: tirsdag, den 12. februar, 2008 20:12:34
Emne: Re: [Radiance-general] External 'clear' shading

Corrections -- I was a little fast and sloppy on this:

A6 = (Td + Ts) / (Rd + Td + Ts) = 0.23 / (0.30 - 0.08 + 0.23) = 0.511
A5 = Sr = 0
A4 = Rs = 0.08
A3 = A2 = A1 = Rd / ((1-Rs)*(1-A6)) = (0.30 - 0.08)/((1-0.08)*
(1-0.511)) = 0.489

yielding:

void trans fritted_glass
0
0
7 0.489 0.489 0.489 0.08 0 0.511 0.5

I don't understand why people find trans so confusing...

-Greg

I order to reduce the need for cooling an external shading (glass
with printing) is used. The data for the shading material is:
Light reflection (for both sides): 30%
Light transmission: 23%

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