Hello 

I hope someone more experienced in EnergyPlus and Archsim could help me to understand. 

I am running an energy analysis to evaluate the performance of perforated solar screens. First, I modeled a simple space with one fully glazed facade. Then, I added a rectangular surface in front of this glazed facade. Finally, I set a "transparency schedule" to the rectangular surface. The transparency schedule was derived from DIVA calculations of the solar irradiation and contains 8760 values or shading coefficients (SC). SC is the ratio of the global solar radiation falling on a vertical plane (facade) with solar protection to that without solar protection. 

However, EnergyPlus uses the SC values to set the same transmittance for both direct and diffuse radiation. Here is where the following questions came up:

1) How does EnergyPlus use the transparency schedule (derived from global solar irradiance) in the calculation of the transmitted solar radiation energy?

2) Is it necessary to calculate SC values for the direct irradiance and other SC for the diffuse irradiance? I mean, is it necessary to separate the direct from the diffuse solar irradiation through DIVA?

3) Can the last calculation give more accurate results about the transmittance behaviour of perforated solar screens (holes and opaque parts)?

Thanks in advance.

Abigail

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