Re: [EnergyPlus_Support] Initial value

[Linda Lawrie <linda@xxxxxxxxxx>]

At 04:13 PM 10/23/2006, David Barrera wrote:

>You mean that looking for "warmup" I'll find out about
>how to modify the tilt or just about boundary
>conditions, or both.

Looking for warmup, you will learn about the intial boundary 
conditions that are used and "warmup convergence" -- that happens 
before the final simulation and results.

For Tilt of roofs and floors, you have to specify the coordinates in 
the order you have given in the "SurfaceGeometry" object.  All (I 
think) of our example files use "Counter Clockwise" to specify the 
coordinates.  If you specify them "clockwise" instead, you will get a 
180 degree tilt from what you want.   Or another way to think of it 
is to "look" from the outside of the roof and specify the coordinates that way.

so, if you have a flat roof at 4.5 meters above horizontal, 
specifying (counter clockwise):
    (0.0     ,   15.24     ,    4.5)
    (0.0     ,   0.0         ,    4.5)
    (5.24   ,   0.0         ,    4.5)
    (15.24  ,   15.24    ,    4.5)

gives you a flat roof of the proper tilt.

whereas:
    (0.0     ,   15.24     ,    4.5)
    (15.24  ,   15.24    ,    4.5)
    (5.24   ,   0.0         ,    4.5)
    (0.0     ,   0.0         ,    4.5)

will give you a roof (I think -- I didn't check this -- just reversed 
the coordinates) of improper tilt.

Look up Tilt or SurfaceGeometry  in the documentation.  I think there 
is a fair explanation there.


Linda

EnergyPlus WebSite: http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team



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