[Radiance-general] Danaplon glazing - Glass or Trans?

[Terrance McMinn]

Hello Rick,

Off List questions...

This is very helpful.

 From the catalogue for 4mm Danpalon Opal
LT% = 40 - LT % of visible light transmission (400 - 700nm)
ST% = 44 - ST % of total solar radiation transmission (300 – 2800nm)
SR% = 35 - SR % of total solar reflection (300-2800nm)
SHGC = 0.48 -  SHGC Solar Heat Gain Coefficient.

I am wondering how you arrived at the 7 parameters: red green blue spec 
rough trans tspec
Actually (red green blue and trans)


Regards
*Terrance McMinn*

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On 21/10/2015 8:45 pm, Richard Mistrick wrote:
>
> Terrance,
>
> Your trans material for the Opal version doesn’t include any 
> reflectance.  Assuming that the visible reflectance is similar to the 
> 35% solar reflectance for this product, and all transmission is 
> diffuse, the result would be:
>
> void trans Danpalon_Sheeting_Opal_4mm
> 0
> 0
> 7   0.75   0.75   0.75   0   0  0.533   0
>
> If you want to have this be a combination of specular and diffuse 
> transmittance, then the last number is the fraction of light 
> transmitted that is in the specular component.  You can add some 
> roughness by changing the second zero in the fourth line.
>
> Rick
>
> *From:*Terrance McMinn [mailto:t.mcminn at iinet.net.au]
> *Sent:* Wednesday, October 21, 2015 2:28 AM
> *To:* radiance-general at radiance-online.org
> *Subject:* [Radiance-general] Danaplon glazing - Glass or Trans?
>
> What would the best way be to model Danaplon translucent material 
> (http://www.danpalon.com)
>
> For example the 4mm 
> (http://www.danpalon.com/eng/home/portfolio/03/default.asp?ContentID=111):
>
> Walls - *1*
>
> Thermal insulation factor - *5.36* W/m2°C
> Moment of Inertia with U Connector - *7.4x10^5 * mm^4 /m
> Minimum cold bending radius - *2.9* meter
> Panel width - 592mm
> Module width (with spacer) - 600mm
> Optical properties:
>
>
> 	
>
> Clear
>
> 	
>
> Ice
>
> 	
>
> Opal
>
> 	
>
> Bronze
>
> 	
>
> Blue
>
> 	
>
> Green
>
> 	
>
> Grey
>
> 	
>
> Reflective
>
> Visible Light
> Transmission
>
> 	
>
> 89%
>
> 	
>
> 55%
>
> 	
>
> 40%
>
> 	
>
> 38%
>
> 	
>
> 64%
>
> 	
>
> 75%
>
> 	
>
> 41%
>
> 	
>
> 20%
>
> Solar Heat
> Gain Coefficient
>
> 	
>
> 0.81
>
> 	
>
> 0.61
>
> 	
>
> 0.48
>
> 	
>
> 0.50
>
> 	
>
> 0.75
>
> 	
>
> 0.72
>
> 	
>
> 0.58
>
> 	
>
> 0.28
>
>
>
>
>
>
>
>
>
> My attempts:
> #
> # Translucent Sheeting Danpalon_Sheeting_Opal_4mm
> #
> void trans Danpalon_Sheeting_Opal_4mm
> 0
> 0
> 7   0.4   0.4   0.4   0   0.02   1   0
>
> #
> # Danpalon_Sheeting_Opal 40% light transmittance
> #
> void glass Translucent_Glass_Danpalon_Sheeting_Opal_4mm
> 0
> 0
> 3   0.43621868   0.43621868   0.43621868
>
> I would assume that the thicker products (more walls) should not be 
> modelled as glass but maybe via the optics program, though I have no 
> idea how/what to feed that program.
>
> Unfortunately the manufacturer has very little technical information 
> available.
> -- 
> Regards
> *Terrance McMinn*
>

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