This is a clear example of why EnergyPlus cannot really claim to support non-convex zones. That zone is not simple enough and this is what the simple, orientation-based algorithm produces. If you want to pre-calculate more accurate view factors off line, you can input them using the ZoneProperty:UserViewFactors:bySurfaceName object.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Monday, January 26, 2015 10:40 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Energy Plus, problems with inside view factors [4 Attachments]
Hello,
I wanted to look at view factors for a very simple single room geometry. I made a simple model and looked at the .bdg file for the view factors. Some of these don't seem believable to me.
For instance in the attached pdf, the factor for wall 6-5 is pretty significant although they are 90 degrees from each other and not internally facing. There is a number of other peculiarities that I cannot figure out. Another example F2-6 is mostly zero, while F2-5 is significant even though wall 5 is farther than 6 and rotated by 90 degrees.
I've checked numerous times to see if my labeling is incorrect on the drawing and in the table but everything seems to check out ok.
Any thoughts?
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Posted by: "Brent Griffith" <Brent.Griffith@xxxxxxxxxxxxxxxxxx>
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