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Re: [EnergyPlus_Support] Modelling full height windows



What front-end are you using that models wall thickness?

  ----- Original Message ----- 
  From: careym.cosmaj 
  To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
  Sent: Friday, May 09, 2008 7:37 PM
  Subject: [EnergyPlus_Support] Modelling full height windows


  Hi,

  Modelling a building where a number of surfaces are completely glazed,
  aluminium frame top and bottom only, and silicon jointed where the
  glazed surface meets the next.

  Geometry initially created using a frontend that avoids this problem
  with the concept of a wall thickness preventing the window from
  occupying the whole surface.

  Have tried a few things in E+;

  1. Have tried to make the Vertex co-ordinates of the
  Surface:HeatTransfer:Sub exactly the same as the underlying
  Surface:HeatTransfer. E+ doesnt appear to like this complaining;

  ** Severe ** GetSurfaceData: Zero or negative surface area, 
  Surface=W_1_3_1

  2. Have tried having a Surface:HeatTransfer:Sub without an underlying
  Surface:HeatTransfer but then E+ reports severe errors about missing
  base surfaces;
  ** Severe ** Error detected in Object=SURFACE:HEATTRANSFER:SUB,
  name=W_1_3_1_1
  ** ~~~ ** Field [Base Surface Name] is required but was blank

  3. Have tried assigning Surface:HeatTransfer objects glazing
  constructions and E+ doesnt like that either;

  ** Severe ** Surface W_1_1_1 has materials of WindowGlass -- illegal
  for this Surface

  4. At the moment I have inset the Surface:HeatTransfer:Sub 50mm from
  the top and bottom only of the underlying Surface:HeatTransfer and E+
  appears content to just warn me about this ...

  ** Warning ** Base surface does not surround subsurface (CHKSBS),
  Overlap Status=Partial-Overlap

  ** ~~~ ** The base surround errors occurred 1 times.

  ** ~~~ ** Surface "W_Z1_2_1" overlaps SubSurface "W_Z1_2_1_1"

  What do others do to model fully glazed walls in E+?

  Regards,

  Mark Carey



   

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