[EnergyPlus_Support] Re: EPlus Simple Model (outside surface temp help)

["hamilton_m_c" <hamilton_m_c@xxxxxxxxx>]

I also am performing some basic wall calculations on a simple box 
zone. I am experiencing a problem that I have not been able to 
resolve. I noticed that the outside wall temperature and roof 
outside temp (for example variable "ZN001:WWALL:Surface Outside 
Temperature[F](Hourly)") is less then the outside air temperature 
ever reaches -1.8F outside air (-6.9 degrees F for Walls, -19.2 
degree F for Roof). I changed the surface temperature to No wind, No 
sun thinking their may be some radiative effect going on. This did 
not correct the problem. I also verified that the outside air 
temperature was maintained constant (-1.8F). The mean daily range 
was set to zero. Does anyone know what is going on here? I could 
post the file but I first wanted to know if there is some modeling 
reason that could cause this. 

Thanks in advance.

Mike Hamilton





--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> There are many REPORT VARIABLEs related to surfaces.  Add REPORT, 
VARIABLE 
> DICTIONARY; to the idf, run the file, and review the rdd output 
file, searching 
> for "Surface".  For definitions of report variables, search the 
I/O Reference.  
> Also add DIAGNOSTICS, DisplayAdvancedReportVariables;
> 
> To report CTF coefficients, use REPORT, CONSTRUCTION;
> 
> This report may be found in the eio output file.
> 
> Regarding the last question, there is also radiant transfer to the 
sky and 
> ground.
> 
> Mike
> 
> 
> 
> On 15 Mar 2007 at 14:55, cienty1 wrote:
> 
> > Hello everyone, I am currently working on my master's project 
which 
> > involves the use of eplus. I have made a simple model of one 
wall to 
> > compare it with manual calculations but I have found I lack the 
> > following information.
> > 
> > 1- Is there a variable that contains the external heat gain for 
a 
> > surface? or better yet is there a list of advance variables 
(like heat 
> > gains, CTF coefficients, etc.?
> > 
> > 2- If I turn off wind and sun for the surface is there any other 
heat 
> > gain variable other than UAdeltaT(db)? (I am trying to do a 
simple 
> > UAdetaT model).
> > 
> > Thanks.
> > 
> > 
> > 
> > 
> > 
> > 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.
> > 
> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf 
and press the
> > "search" button.
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@...
>




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