[EnergyPlus_Support] Solar Angles Calculations

[saleh saadi <salehsnjsaadi404@xxxxxxxxx>]

Hello Everyone,

I'm trying to understand how E+ calculates the solar angles such as incident angles on tilted surfaces (or simply for vertical surface). I have used correlations in Duffie and Beckman Book " Solar engineering of thermal process" to calculate the solar angles. I extracted data of cos of incident angles from E+ (output: Surface Ext Solar Beam Cosine Of Incidence Angle) and compare the two results. For some days, the values are matching but for others they are off . For this exercise, I have used a vertical south wall with no shading, and no windows. 

For 1hr time step:

Does E+ calculates the solar angles at the end of the time step or at mid point of time step? or averaged over some points in a time step?

thanks,

Saleh

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