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

[Richard Mistrick]

Terrance,

I have a spreadsheet to process the equations for this.  See http://radiance-general.radiance-online.narkive.com/ugCzWij7/accurate-definition-of-trans-material for the equations.

I think the spreadsheet is included in our DAYSIMps installation if you download and install that software.

Rick

From: Terrance McMinn [mailto:t.mcminn at iinet.net.au]
Sent: Wednesday, October 21, 2015 1:03 PM
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] Danaplon glazing - Glass or Trans?

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<mailto: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 - 7.4x105 mm4/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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