[EnergyPlus_Support] glare index difference (upload the input files)

["Hu,Jia" <hujia06@xxxxxxxxx>]

Hello everyone:

 

I have two question about Glare Index.

 

First, I simulate an office with a single big window.  The width and the height of the window are 1.8m*1.8,  There are interior blinds for this window, the angle is 45 deg. Through simulation, I got a glare index in every hour.

 

Then, I divided the big window into 3 small windows (each is 1.8 (width)*0.6(height) ) by defining three objects (all of them are windows) in FenestrationSurface:Details. And each small window has the same binds angle and width as the above one.

 

Because of the dividing line existed in the second three-small window, it is probable that the actual area of the window is a little smaller than that of the first one.

I found the glare index in the second window (three small)  is larger than that in the big window. Does this phenomenon make sense? I think the opposite is right.

 

Another problem is that the the glare index in the second ref. point (3.5m away from window) is 0 for a whole year. (The window is facing south and the Glare Calculation Azimuth Angle is 270, that means the people in the office face west). Is it possible for this value? The glare index in the first ref point (0.75 away from window) is positive value.

 

I  uploaded the two idf files before at URL: http://groups.yahoo.com/group/EnergyPlus_Support/files/_Problem_Submittals/glare%20index%20comparison.zip
The only difference between the uploaded files and my current ones is that the GlareCalculationAzimuthAngle in the idf file is 180 rather than 90 as I mentioned above, so the glare index in the second ref. is positive rather than 0 as I mentioned

 

Thank you all in advance.

 

Jia

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