[EnergyPlus_Support] Re: Temp can't meet setpoint

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

Hi Mike,
  I check the temp,and find the although the supply airtemp can meet 
the setpoint,the zone temp can't meet setpoint yet.And i found that 
if i change the groundtemperature object values,then the zone temp 
can meet the setpoint.I'am puzzled.For a long time,i add the 
groundtemperature object with its default values(18).I look the i/o 
reference,it told me that the values in this object is calculated by 
slab.exe.Is it said that when we create a model,we should calculate 
the groundtemperature at first?If yes,when we use slab.exe to 
calculate the temp,we should create the idf.But there is much more 
variables to define and some is unknown to me.How can l deal with?
  thanks a lot.

  pch 


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@g...> wrote:
> If the supply air temperature is not meeting setpoint, then the 
coil is too 
> small or the chilled water supply is too warm.  Is the chilled 
water supply 
> loop meeting its setpoint?
> 
> Mike
> 
> 
> On 20 Jan 2005, at 11:56, hbn_pch wrote:
> 
> > 
> > 
> > Hi,
> >   I run a simulation and find that the zone temp can't meet 
setpoint.
> > I check the zone inlet node temp and vav outlet node temp.I find 
when 
> > heating,the vav outlet node meet the supply air setpoint(16) and 
the 
> > zone inlet node temp rise more during controlled period(53-
> > 56).Howerer,the zone temp can't meet setpoint(20).when 
cooling,the 
> > vav outlet node(14-15) can't meet the the supply air setpoint(12) 
and 
> > the zone temp can't meet the setpoint too.
> >   How can 1 adjust it?I'v upload the idf(pch-03.idf).
> >   Thanks for your help.
> > 
> >  pch
> > 
> > 
> > 
> > 
> > 
> > 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@g...





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