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Re: [EnergyPlus_Support] Re: load problem
The third infiltration coefficient is multiplied by windspeed. Do the design
days or weather file have non-zero wind speeds? Add the report variable for
wind speed to confirm. See the Input Output Reference for the meaning of the
various infiltration coefficients.
As mentioned in my reply to another thread, a ventilation load report variable
is under development. It is not easy to calculate. Side-by-side simulations
are the best approach.
Mike
On 26 Aug 2005, at 11:39, hbn_pch wrote:
> 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...
>
>
>
>
>
> 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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