[EnergyPlus_Support] Re: Pump Power calculations

["JV Dirkes II" <jvd2pe@xxxxxxx>]

Dear Richard,

So, pardoning my ignorance of SI, if 
%Power = %Head x %NomFlowRate / Eff
does that mean that m3/s x Pa = W ?? (i.e., no units conversion
constant?  That doesn't seem right...)

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad
<RRaustad@...> wrote:
>
> Straight out of the sizing routine...
> 
>         PumpEquip(PumpNum)%NomPowerUse =
(PumpEquip(PumpNum)%NomPumpHead 
> * PumpEquip(PumpNum)%NomVolFlowRate) / TotalEffic
> 
> 
> JV Dirkes II wrote:
> >
> > Dear E+ Forum,
> >
> > For ASHRAE 90.1 baseline models, a pump is limited to a specific unit
> > power (e.g., 22W / gpm for chilled water pumps). I want to autosize
> > the pumps, but use a Delta P and motor efficiency that will always
> > result in the desired unit power. My derivation of that Delta P value
> > does NOT result in the power level that I expect when I run E+. So,
> > either my derivation is incorrect, or E+ calculates the power in a
> > different manner.
> > Will someone direct me to the E+ power formula for situations when the
> > pump is autosized? I must be missing something, but cannot find it in
> > "Help". Thanks!
> >
> >  
> 
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL  32922-5703
> Phone:   (321) 638-1454
> Fax:     (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
> 
> UCF - From Promise to Prominence: Celebrating 40 Years
>



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

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.

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:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto: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/