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[EnergyPlus_Support] glare index asymmetry
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] glare index asymmetry
- From: "Wouter" <wouter.beck@xxxxxxxxx>
- Date: Thu, 08 Oct 2009 19:37:42 -0000
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- Delivery-date: Thu, 08 Oct 2009 13:37:49 -0600
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Hi everyone,
I ran some simulations in which I calculated the glare index for three window orientations: the window normal is pointing east, south and west, respectively. The reference point is 1.3 meter from the window and the viewer azimuth angle is 90 deg. The weather file is for Amsterdam. From the InputOutputReference I gather that the viewer is looking south when the window normal vector points east. The number of hours the glare index exceeds a certain threshold (22 say) is significantly less for the west orientation when compared to south and east. First my interpretation was: for west the viewer is effectively looking north, so there will be less hours of direct sun or high luminance in the field of view. However, if I change the azimuth angle to 270, I get the same results for all directions.
What am I missing?
Wouter Beck
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