Re: [EnergyPlus_Support]

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

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...




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