Re: [EnergyPlus_Support] Hard to believe results?

["Michael J. Witte" <mjwitte@xxxxxxxx>]

If you are still uncertain that the balance temperature in the space is 
correct, I would suggest looking at a variation of your run with:

a)  Daily Temperature Range = 0 so that you have a constant outdoor temperature.

b)  Sky Clearness = 0 so that you have no sunshine.

And perhaps even remove the floor or change it to be an exterior surface.  Then 
add these features back in one by one and see how the results change.

Mike


On 9 May 2004, at 12:02, David Strip wrote:

> Thanks for the help. A couple of comments are mixed with your reply:
> 
> Michael J. Witte wrote:
> 
> > The following warnings mean that the floor and roof surfaces are 
> > upside down,
> > so your roof is not seeing any sunshine.
> >
> >    ** Warning ** Floor Tilt=0.0, much less than expected tilt of 180, for
> > Surface=ZN:001:FLOOR, in Zone=ZONE ONE
> >    ** Warning ** Roof/Ceiling Tilt=180.0, much greater than expected 
> > tilt of 0,
> > for Surface=ZN:001:ROOF, in Zone=ZONE ONE
> 
> Oops - I sent the wrong file. I had corrected these, but I guess I sent 
> the previous version of the file.
> 
> >
> > Fixing the above problem actually makes the zone even warmer now that 
> > the roof
> > gets solar gains.  The primary driver in this model is the floor 
> > slab.  It is
> > large, and the ground temperatures are set to +19C.  So the floor slab is
> > heating the zone on the cold day and cooling the zone on the hot day.  
> 
> This is obviously the big mistake in the run. I fixed this and it makes 
> a difference, though not so much that it fully explains the steady state 
> temp. I guess the sun is really worth a lot, a least in places like New 
> Mexico, where it actually shines!
> 
> Thanks again for your help.
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx



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