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Re: [EnergyPlus_Support] Re: outside air problem
A separate OA system cannot feed directly to the fan coil units in EnergyPlus.
It can only supply air directly to the zones.
Mike
On 18 Nov 2005, at 2:23, hbn_pch wrote:
> Mike,if i want to supply conditioned outside air,for example,i want
> to supply outside air in 14C for dehumidification in summer and
> supply outside air in 18C in winter,then i have to separate the
> outside air system from the fan coil system.The outside air unit
> contained a OA mixer,a cooling coil,a heating coil and a supply fan.
> (it seemed to the supply side of the primary air loop).But how can i
> connect it to the fan coil unit?The fan coil unit is a zone equipment
> but not a terminal unit.Is it possible?
>
> pch
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> <mjwitte@g...> wrote:
> >
> > 1. Both methods will introduce the same quantity of outdoor air
> into the
> > system. Not all fan coil system rely on a separate system to
> introduce outdoor
> > air, some are built with an outside air intake. Is there a big
> difference
> > between simulating it as a separate system or as part of the fan
> coil unit?
> > That depends on whether the separate system would do any special
> control for
> > humidity. If not, the difference in results will be small. So use
> the
> > simplest method unless there is a significant reason to use a more
> complex
> > model.
> >
> > 2. These values have a very small impact on coil sizing. The
> default values
> > can be used for most applications.
> >
> > 2b. Consideration of humidity control is very regional. You
> should model what
> > is important for your climate.
> >
> > Mike
> >
> >
> > On 14 Nov 2005, at 9:39, eric_zhou1223 wrote:
> >
> > > Hi,
> > >
> > > 1.For the Dxcoil and Fancoil system, users may define required
> fresh
> > > air for a zone using the outdoor air mixer. The autosized value
> in
> > > the field ¡°maximum outside air flow rate¡± could satisfy the
> > > ventilation requirement of occupants. My question is , as we
> know,
> > > since there exists in reality another air loop specially for the
> > > fresh air inducement, is this method here only a simulative
> method
> > > to handle the ventilation problem? Can I use this simplified way
> here
> > > (defining the desired fresh air amount in above field ) to
> simulate
> > > a ¡° Fancoil + outdoor air¡± system, instead of using a complex
> > > Fancoil system along with an additional Fresh Air Handling Unit
> to
> > > meet the ventilation demand? What is the difference between the
> two
> > > method from a fresh air supply perspective?
> > >
> > > 2 How can I identify the fields ¡°Zone cooling/heating design
> > > supply air humidity ratio¡±? The default values can be regarded
> as
> > > ¡°standard ¡± values or need to be revised based on each
> situation ?
> > > I thought the value , specially for the heating , seem to be over
> > > dry.
> > >
> > > Is ignoring the humidity control a common practice for an office
> > > building energy simulation?
> > >
> > > Thank you very much
> > >
> > > Eric
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 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@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
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>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf and press the
> "search" button.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
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