RE: [EnergyPlus_Support] Modelling full height windows

["Crawley, Drury" <Drury.Crawley@xxxxxxxxxx>]

EnergyPlus requires that the heat transfer surface be a small bit larger
than the window.  A millimeter is sufficient.

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of careym.cosmaj
Sent: Friday, May 09, 2008 10:37 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
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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