Re: [EnergyPlus_Support] A Question About FANCOIL:4PIPE

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

The outside air flow rate in the fancoil model is fixed.  Whenever the fancoil 
unit is schedule to be on, the fan runs continuously and the outside air flow 
rate is constant.  There are no other control options available for the fancoil 
unit.  When the outdoor air temperature is cool outside, the cooling coil in 
the fancoil unit will automatically consume less chilled water since the 
outside air is providing some cooling.  But there is no way to increase the 
outside air flow as with an economizer.

If the outside air flow rate is autosized, the flow is according to the ZONE 
SIZING inputs.

Mike


On 15 Dec 2007 at 12:52, Àî ×¼ wrote:

> Dear EnergyPlus Support Team:
>    I am simulating a building using fancoil for air-conditioning and my 
> IDF is just like the example file "FancoilAutosize".I want to know how 
> the Fancoil:4pipe modulates the outside air flow rate. 
>    How is the maximun outside air rate autosized?Is it just determined 
> by ZONESIZING?Is the outside air flow aways set to the autosized 
> maximun outside air flow rate? 
>    I want to use outside air for free cooling when the outdoor 
> temperature is lower than the zone air set point.Am I supposed to creat 
> a CONTROLLER:OUTSIDE AIR for the fancoil out side air mixer?Wheather or 
> not the FANCOIL;4PIPE  modulates the outside air flow in a complex way 
> just like CONTROLLER:OUTSIDE AIR?
>    Thanks for your help!
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
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> 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.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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