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[EnergyPlus_Support] Solar distribution in a double skin facade against simple skin results

Dear all,

I am studying a double skin facade design. I want to compare with a design using a simple skin with windows that have a SHGC of 0.25 because it is the assembly SHGC I have to reach according to the local chinese standard. See the architect have asked me to justify the cost of using the external skin...good question when you think about it!

So I have chosen inner skin and outer skin glazings so that it is equivalent first with a simple approximation of SHGCin x SHGCout = 0.25 . I know it is too simple but still it should not be too different in the zone inside the building.

I am having trouble understanding the following fact:

Having a combined SHGC of the inner and outer skin very close to the simple skin I try to compare with, I do not obtain at all the same amount of sun in the zone inside the building. Why? Normally the sum of the direct and diffuse solar transmitted through the internal windows should be close to the one through the external window in the case of the simple skin no?

I have the feeling I am totally missing something basic here but it's late and I don't see it.

Your help is more than appreciated!

Thanks
Aymeric




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