Re: [EnergyPlus_Support]

["Michael J. Witte" <mjwitte@xxxxxxxx>]

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@xxxxxxxx




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