Re: [EnergyPlus_Support] question about outside air system plus unit ventilator

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

(Sorry this was not answered sooner.)  

There is not a way to connect pretreated air to the unit ventilator, because 
the unit ventilator forces outside conditions on the outside air node.  The 
system you describe is similar to the SINGLE DUCT:CONST VOLUME:4 PIPE INDUC 
system, except SINGLE DUCT:CONST VOLUME:4 PIPE INDUC does not allow for a zone 
fan.  SINGLE DUCT:SERIES PIU:REHEAT has a zone fan, but it only has reheat, no 
zone cooling coil.  If I am understanding the system correctly, I would suggest 
using SINGLE DUCT:CONST VOLUME:4 PIPE INDUC and adding the zone fan power 
either as additional fan power on the central unit or as an ELECTRIC EQUIPMENT 
object in each zone.

Mike


On 8 Jul 2005, at 20:46, zhaicq98 wrote:

> Hi,
> 
> I am working on a system which was designed for lab space. There are 
> a heating coil, cooling coil, and supply fan and exhaust fan in the 
> main air handling unit (AHU). In each lab space, there is a unit 
> ventilator, which includes a cooling coil, heating coil and a fan. 
> 
> The pre-treated outside air from the main AHU is delivered to each 
> lab space, where it gets mixed with the re-circulated air in that 
> lab. The mixed air is then drawn through the unit ventilator, where 
> it gets further cooled/heated. The exhaust air is drawn through the 
> lab hood to the main AHU, where it is exhausted. 
> 
> I encountered some problems when I tried to simulate this system in 
> E+. It seems to me that the unit ventilator in E+ will do the job. 
> But I do not know how to connect the pre-treated outside air to the 
> unit ventilator and how to get the air exhausted from the lab hood. 
> 
> Your help is really appreciated. 
> 
> Thanks,
> Chaoqin
> 
> 
> 
> 
> 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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