[EnergyPlus_Support] Re: load problem

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

Thanks for your suggestion.I test and find the infiltration heat 
gain&heat loss is zero.I checked the infiltration schedule and the 
coefficients.i used the coefficients (0,0,0.2237,0)in examples.Then i 
changed to(1,0,0,0) as default for energyplus,then the infiltration 
heat gain&loss become non-zero.What caused this change?
   Otherwise,if i use a full system,such as vav system,how to get the 
outside air load?Which variable should i define?

   thanks
   pch

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@g...> wrote:
> What you have done should be working.  The outside air option in 
Purchased Air 
> is only useful for a peak load calculation, otherwise for what you 
are doing, 
> INFILTRATION is the best approach to add an outside air load.  The 
purchased 
> air cooling load should increase when there is additional heat gain 
introduced 
> by infiltration.
> 
> Turn on the report variables for infiltration heat gain and heat 
loss to 
> determine where the problem is.  If these are zero during the 
cooling seaon, 
> then check the schedule and the coefficients on the infiltration 
object.
> 
> When modeling a full system, such as a VAV system, then outside air 
should be 
> introduced through an outside air system component with a mixing 
box and 
> outside air controller (see 5ZoneAuto.idf example file, and others).
> 
> Mike
> 
> 
> On 23 Aug 2005, at 11:16, eplus2005 wrote:
> 
> > Dear all,
> >    I want to gain the load of building model.I divided the 
building 
> > load to three parts as follows:
> >    1.load produced by outside environment;
> >    2.load produced by space gains(people,lights,electric 
equipment);
> >    3.load produeed by outside air.
> > 
> >    According to the load parts,i created three models.The first 
case 
> > has only building informationg.The second adds the space gains 
and 
> > the third adds the outside air.
> > 
> >    But i found that whether or not add  outside air,the cooling 
load 
> > did't change,it just adds the heating load.(Why?)
> > 
> >    All cases use the purchased air.Otherwise,i'm puzzled for the 
load 
> > produced by outside air.i don't know where to define the outside 
> > air,so i use the infiltration instead(Is it reasonable?).In Each 
> > case,I use the variable values Purchased Air Cooling Rate as load 
> > values(is it reasonable?)
> > 
> >    If i don't want to use infiltration or ventilation,then how 
can i 
> > get the load produced by outside air and how to define?If i use a 
> > real system(e.g VAV),how should i define the outside air volume 
and 
> > get the load it produced?
> > 
> >    Thanks in advance! 
> > 
> > 
> > 
> > 
> > 
> > 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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