[EnergyPlus_Support] Re: Unmet load hours due to increased fan pressure rise

["JFCS" <jamo0312see@xxxxxxxxx>]

Still can't figure this out, how do you properly manage your setpoint?

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, jeannieboef  wrote:
>
> Fan Pressure should have zero bearing on unmet loads. Its only  
> function is to calculate electricity consumption. even though the  
> motor heat will enter the airstream if it is designated as being in  
> the airstream, I doubt this is your problem.
> 
> That being said, your method for baseline fan power sizing by  
> adjustment of the pressure rise looks right.
> 
> You are allowed 300 hours unmet load, as long as the design case also  
> has 250 or more but less than 300 (deviation of 50), though proper  
> setpoint management should keep you under 50 for a good model.
> 
> Sent from my iPhone
> 
> On 17.01.2013, at 10:15, "JFCS"  wrote:
> 
> > My model gains unmet load hours or time set point not met during  
> > cooling operations, when even i increased fan pressure rise of my  
> > fans.
> >
> > First I autosized a working model with complete hvac system for my  
> > Baseline case as per "G3.1.2.8 Design Airflow Rates". Then I need to  
> > adjust my VAV's fan power as "G3.1.2.9 System Fan Power" therefore I  
> > need to increase the pressure rise of my fans. Thought i got the  
> > correct fan power but the unmet load hours is below 300hours...
> >
> > Any suggestions?
> >
> >
>



------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/