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Re: [EnergyPlus_Support]
1. Version 1.2.1.012 is no longer supported, version 1.2.2 is the latest
release.
2 and 3. A ZONE EXHAUST FAN may be added to each zone individually. The
central OA air loop must have a return path defined, even though the return air
flow will net to zero after the exhaust fan flow is subtracted from the zone
supply air flow.
4. Some ventilation load reporting is under development, but it is approximate
at best. The cleanest way to assess the impact of ventilation air is to do a
sensitivity to different amounts of OA in different runs and compare results.
This can be misleading if not done properly, so be sure the runs make the
correct comparison to answer the question.
Mike
On 26 Aug 2005, at 11:24, hbn_pch wrote:
> Thanks.According to your suggestion,i created a simple model to test
> and encounter some problems:
> 1.it appeared the same problems as i've mentiond before.There is
> no other error information except following warning:
>
> Program Version,EnergyPlus 1.2.1.012, 2005-8-26 19:01,IDD_Version
> 1.2.1.012
> ** Warning ** The design coil load is zero for
> COIL:Water:SimpleCooling RESISTIVE ZONE_FANCOILCOOLINGCOIL
> ** ~~~ ** The autosize value for max water flow rate is zero
> ** ~~~ ** To change this, input a value for UA, change the
> cooling design day, or lower
> ** ~~~ ** the zone cooling design supply air temperature
>
> 2.In fact,there is no return air from zone to the centralized
> outside air unit,it just as the source air of the fancoil unit.But
> for structure definition,i must define a return air,then did it has
> influence to the real system?
>
> 3.In real,each zone has single exhaust system.But in i/o,it seems
> allowing only one exhaust fan in the return path(it is inexistence in
> fact).Then how can i define?
>
> 4.If the model completed successful,i just want to gain the load
> produced by the outside air,how to difine variable or how to calculate
>
> i've upload the test file named Fancoil&OA system,appreciated your
> kind help.thanks very much.
>
> pch
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> <mjwitte@g...> wrote:
> > First, consider whether the energy use will be different if the
> outside air is
> > conditioned by the fan coils vs. the central unit. If the central
> outside air
> > unit is doing no special humidity control and simply provides
> tempered outside
> > air, it would be quite reasonable to add the OA and some extra fan
> power to the
> > fan coil units.
> >
> > If you want to model the full details of the central system, then
> keep the fan
> > coil units that are already serving the zones (with zero outside
> air flow) and
> > add an air loop to provide the conditioned outside air to the
> zones. If the OA
> > system is constant volume, use DIRECT AIR terminal units. Each
> zone will then
> > be served by two pieces of equipment, the fan coil and the direct
> air. Make
> > sure that the direct air (the OA system) is always set to priority
> 1 for
> > heating and cooling so that the fan coil unit will see any
> additional load
> > added to the space by the air from the OA system.
> >
> > Mike
> >
> > On 24 Aug 2005, at 11:46, hbn_pch wrote:
> >
> > > Dear all,
> > > There is a real 5-story building.Each room has a fancoil unit
> to
> > > serve.Each floor has a centralized outside air unit.Cooling
> source is
> > > centralized chillers and heating source is steam.
> > >
> > > I simply "zone" each floor to 4 zones.And i use fan coil
> unit:4 pipe
> > > as the terminal unit for each zone.Problem come:In the fancoil
> unit
> > > definition,each unit has its own outside air mixer.But in the
> real
> > > system,there is a centralized outside air unit,and it serve for
> one
> > > whole floor.Then how to define it???
> > >
> > > Which reasonable system should i select?
> > >
> > > Thanks.
> > > 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...
>
>
>
>
>
> 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
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