[EnergyPlus_Support] Window shading

["tonybaxterhevacomp" <tony@xxxxxxxxxxxx>]

Hello Linda,

We have a strange problem with EnergyPlus.  We have defined 2 rooms, 
room A and room B.  Room A is north of room B.  Room A has a north 
facing window. Room B has a south facing window.

We now place external window fins on the south facing window in room 
B.  This shades the south facing window as expected, but 
unexpectedly, the fins also shade the north facing window in room A, 
early morning and late evening.  Further, the problem only occurs if 
you have more than 5 fins!, less than 5 fins and no shading occurs on 
the north window, as you would expect.

We have drilled down on this problem, as we thought we may have got 
the geometry wrong, but I dont think we have.  We further replaced 
the fins with "Surface:Shading:Detached:Building" objects and we got 
the very same problem when we had >5 shading objects.

We have two input files to demoonstarate the problem :  5fins.idf and 
6fins.idf, together with a weather file in.epw - how can I send these 
files to you?

Any comments would be appreciated

Tony Baxter
Hevacomp







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