[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Pump Power calculations

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/