Revision history [back]

@rpg777, thank you so much for the helpful answer. I assumed that Radiance doesn't account for reflectance based on the sample definition of glass material in Radiance's guide, in which only transmissivity is required to complete the material definition

For example, the following glass material definition mentioned the glass's transmissivity of 0.75 and there is no mention of the glass's reflectance

void glass SinglePane
0
0
3 0.75 0.75 0.75

Anyway, I just found a glazing unit that I would like to use, so I exported it to radiance and here is what I got



void  glass       RefliteArcticBlue6mm_glass
0
0
3     0.160     0.179     0.131

void  BRTDfunc    RefliteArcticBlue6mm_front
10
      0.555     0.561     0.478
      0.147     0.164     0.120
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0

void  BRTDfunc    RefliteArcticBlue6mm_back
10
      0.121     0.236     0.275
      0.147     0.164     0.120
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0

I tried to read the post that you referenced in your answer to combine both BRTDfunc but the post is so messy and hard to follow, and I was wondering if anyone here can direct me to a clear reference to do this?

As an alternative, can I model two surfaces for both glazing layers? first layer's material will include the first three lines and the BRTDfun of the front, and the material of the second layer will have the first three lines and the BRTDfunc of the back? is this the right way to do this?

Finally, a quick note: I'm using Honeybee for Grasshopper. Will I be able to run annual simulations (daysim) with these type of materials? I know that in the past Daysim couldn't handle material definitions that contain a .cal file.

@rpg777, thank you so much for the helpful answer. I assumed that Radiance doesn't account for reflectance based on the sample definition of glass material in Radiance's guide, in which only transmissivity is required to complete the material definition

For example, the following glass material definition mentioned the glass's transmissivity of 0.75 and there is no mention of the glass's reflectance

void glass SinglePane
0
0
3 0.75 0.75 0.75
 

Anyway, I just found a glazing unit that I would like to use, so I exported it to radiance and here is what I got got

void  glass       RefliteArcticBlue6mm_glass
0
0
3     0.160     0.179     0.131

void  BRTDfunc    RefliteArcticBlue6mm_front
10
      0.555     0.561     0.478
      0.147     0.164     0.120
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0

void  BRTDfunc    RefliteArcticBlue6mm_back
10
      0.121     0.236     0.275
      0.147     0.164     0.120
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0

I tried to read the post that you referenced in your answer to combine both BRTDfunc but the post is so messy and hard to follow, and I was wondering if anyone here can direct me to a clear reference to do this?

As an alternative, can I model two surfaces for both glazing layers? first layer's material will include the first three lines and the BRTDfun of the front, and the material of the second layer will have the first three lines and the BRTDfunc of the back? is this the right way to do this?

Finally, a quick note: I'm using Honeybee for Grasshopper. Will I be able to run annual simulations (daysim) with these type of materials? I know that in the past Daysim couldn't handle material definitions that contain a .cal file.

@rpg777, thank you so much for the helpful answer. I assumed that Radiance doesn't account for reflectance based on the sample definition of glass material in Radiance's guide, in which only transmissivity is required to complete the material definition

For example, the following glass material definition mentioned the glass's transmissivity of 0.75 and there is no mention of the glass's reflectance

void glass SinglePane
0
0
3 0.75 0.75 0.75

Anyway, I just found a glazing unit that I would like to use, so I exported it to radiance and here is what I got

void  glass       RefliteArcticBlue6mm_glass
0
0
3     0.160     0.179     0.131

void  BRTDfunc    RefliteArcticBlue6mm_front
10
      0.555     0.561     0.478
      0.147     0.164     0.120
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0

void  BRTDfunc    RefliteArcticBlue6mm_back
10
      0.121     0.236     0.275
      0.147     0.164     0.120
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0

I tried to read the post that you referenced in your answer to combine both BRTDfunc but the post is so messy and hard to follow, and I was wondering if anyone here can direct me to a clear reference to do this?

As an alternative, Alternatively, can I model two surfaces for both glazing layers? first layer's material will include the first three lines and the BRTDfun of the front, and the material of the second layer will have the first three lines and the BRTDfunc of the back? is this the right way to do this?

Finally, a quick note: I'm using Honeybee for Grasshopper. Will I be able to run annual simulations (daysim) with these type of materials? I know that in the past Daysim couldn't handle material definitions that contain a .cal file.