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Re: [EnergyPlus_Support] Window5 data file



Linda.

The documentation is a little short on explanations about how UnenteredOtherZoneSurface is treated.  Let me see if I assume correctly:

If an 'adjacent' ( I understand that this is geometrically meaningless for the calculations) zone surface or subsurface is specified as OutsideFaceEnvironmentObject for a surface, I assume that the outside face condition of the surface in question includes adjacent object material energy balance, including radiative effects, etc, as well as zone temperature.  Is this simplified to only include zone temperature if the other zone surface is 'Unentered' and therefore generated as a proxy surface in the specified zone, not actual geometry in the adjacent zone?  ie, is this condition of this proxy surface also calculated in the adjacent zone?  And if so, what happens to the actual adjacent surface, if it is modeled in teh adjacent zone?

If Unentered is specified, and real adjacent surfaces and subsurfaces exist in the adjacent zone, how should these be treated?  Should these also have an Unentered object for their outside face environment, or can the actual adjacent surface be used?

I assume that there is no concrete calculation of conservation of energy between two zones with adjacent surfaces, but that it works out pretty well due to the calculatino method.  I assume that the outside face environment object is a way to simply define energy flows in/out of the surface through the outside face through the convection algorithm.

With that in mind, for an internal window with potential solar gains, it would seem important that the position and orientation of the outside face environment object of the interior zone surface in relation to the exterior window is very important (even though only diffuse solar enters the interior zone, it is dependent on the directionality of solar through the exterior zone).  That said, I can see how an Unentered surface would take care of the exterior zone surface outside face condition, but would not work well for the interior zone window surface.

Afraid of faking out the software and losing energy.

Phew!  

r3


  ----- Original Message ----- 
  From: Linda Lawrie 
  To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
  Sent: Friday, May 02, 2008 11:41 AM
  Subject: Re: [EnergyPlus_Support] Window5 data file


  Don't forget... there is the UnenteredOtherZoneSurface that will take 
  care of this instance if the base interior surface is used. Read 
  about them in the Input Output Reference. EnergyPlus does the job of 
  "reversing" the layers.

  Linda

  At 12:39 PM 5/2/2008, Rob Hitchcock wrote:
  >No warnings are generated for the case where internal windows (or other
  >surfaces) do not have reversed layer order for opposite sides of the
  >surface. However, layer orders should be reversed for interzone
  >windows, whether they are input directly in the IDF or by import from a
  >WINDOW5 data file. Of course if the window construction only consists
  >of a single layer, or if the layers are symmetrical, this does not matter.
  >
  >Rob
  >
  >coolshadow10a wrote:
  >
  > > Is it possible, and/or what should I look out for, to use a Window5
  > > data file construction for an internal window? Primarily, do I need
  > > to build another version of the window with the layers reversed for
  > > the facing subobject in the adjacent zone? The file runs with no
  > > warnings associated with the adjacency, just wondering if I'm being
  > > misled, and if solar through the interior window is still treated
  > > 'correctly'.
  > >
  > > r3
  > >
  > >
  >
  >
  >
  >
  >[Non-text portions of this message have been removed]
  >
  >
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