[EnergyPlus_Support] Re: Sizing according to ASHRAE 90.1

["FrancescoP" <direzionecontraria@xxxxxxxx>]

Thank you very much!


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jim Dirkes <jim@...> wrote:
>
> E+ uses "efficiency " in a way that is somewhat confusing:
> "Motor Efficiency" = motor efficiency (e.g. .92)
> "Fan Efficiency" = Fan mechanical efficiency * motor efficiency (e.g., .50 * .92 = .46)
> 
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of FrancescoP
> Sent: Tuesday, August 28, 2012 8:53 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Re: Sizing according to ASHRAE 90.1
> 
> 
> 
> This discussion was very useful, but now I have a new question. ASHRAE 90.1-2007 provides a method to calculate the "Fan motor Efficiency". As I'm modelling a VAV system with reheat, I'm using the object Fan:VariableVolume that has two fields relative to efficiency: "Fan efficiency" and "Motor efficiency".
> Is the "Fan motor Efficiency" of ASHRAE equal to "Motor efficiency" of EnergyPlus? And about the "Fan efficiency" of EnergyPlus?
> Or is the "Fan motor Efficiency" of ASHRAE equal to product of "Motor efficiency" of EnergyPlus and "Fan efficiency" of EnergyPlus?
> Best Regards
>




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

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/