Re: [EnergyPlus_Support] Energy Consumption between DOAS and VAVsystem?

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

There is not enough information to answer your question.  A DOAS does not stand 
alone, it has some other type of system to meet the internal and envelope 
loads.  I would suggest that first, you make sure the two system alternatives 
are truly meeting the same load requirements - are the zone temperatures the 
same?  Is one system controlling humidity better?  Is the quantity of fresh air 
delivered the same?  Is the VAV using an economizer?  Does the DOAS 
configuration have a way of bringing in extra fresh air for economizer 
operation?  I would some extra runs with features such as humidity control and 
economizers turned off first to make sure the system are meeting equivalent 
loads, then add things back one by one to understand the impacts.

Mike


On 30 May 2007 at 2:43, love9787m wrote:

> HI, 
> 
> I've analyzed energy consumption between DOAS and VAV system.
> DOAS needs small air flow rate and plant capacity comparing to
> VAVsystem.
> Of the results, However, Facility Electricity of DOAS is larger than 
> VAV system. 
> Apparently, I  enetered not only low value at the chiller or Tower 
> capacity but small outside air to system.
> (Water flow rate;0.0007§©/s to DOAS and 0.0011 §©/s to VAVsystem)
> (Air Fflow fate: 0.07 §©/s to DAOS and 0.14 §©/s to VAV ssytem)
> 
> So What is the problem. And what is the demanding factor that 
> affects the system energy consumption. 
> In this case, What is the way to reduce energy consumption?
> 
> regards
> Dea Woong HA
> 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
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> 
> Attachments are not allowed -- please post any files to the appropriate folder
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> 
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> 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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