Hi,

I've noticed the default glazing materials in DIVA v3 includes a SHGC as well as a visible light transmission (VLT) and further, the new LEED v4 assessment requires calculation of illuminance & solar exposure - does this mean there is a way to define differing thermal and light transmissions for a single radiance material? I need to report illuminance and solar exposure on the working plane for a given glazing material where the visual and thermal transmittance are not equal.

Regards,

Ian

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Hi Ian,

Actually, unfortunately, this isn't what is going on. The materials are defined according to the VLT. If you want to calculate the irradiation, you will have to make a separate material.

For example,

# Glazing_DoublePane_Clear: Tau_vis = 0.80; SHGC= 0.72 ; U-Value= 2.71W/m2K
# visual transmittance: 80%
# visual transmissivity: 87%
void glass Glazing_DoublePane_Clear_80_Tvis
0
0
3 0.872 0.872 0.872

void glass Glazing_DoublePane_Clear_72_SHGC
0
0
3 0.7848 0.7848 0.7848

You would need to switch the materials between your visible light and solar exposure calculations.

Best,

Alstan

Thanks for the clarification Alstan,

This may cause confusion for users completing the LEED v4 analysis as an ASE and sDA result is output for each simulation of a single material with no mention that one may be incorrect for reasons discussed.

 

Regards,

 

Ian

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