[EnergyPlus_Support] Re: Variable speed pumps

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

Thanks, Richard!

I don't look in the Engineering reference often enough; I guess I'll
have to broaden my search technique!

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad
<RRaustad@...> wrote:
>
> Did you miss this equation in the Eng. Ref?
> 
> PartLoadRatio = VolFlowRate / PumpEquip(PumpNum)%NomVolFlowRate
> 
> JV Dirkes II wrote:
> >
> > Dear Eplus Forum,
> >
> > After creating some curve fits for a couple variable speed pump
> > configurations, it occurred to me that I was not really sure what E+
> > thinks is the "PLR". I had assumed it to be the actual load fraction.
> > For a CONSTANT temperature water system, water flow rate will be
> > proportional to load fraction. For a VARIABLE temperature system
> > (e.g., reset by outdoor air temperature), load fraction and water flow
> > rate are NOT proportional.
> >
> > I'm hoping that E+ uses water flow rate as the basis for "PLR". Will
> > someone let me know for sure? Thank you.
> >
> > >From the I/O Reference:
> > FractionFullLoadPower =C1+C2PLR+C3PLR +C4PLR
> >
> >  
> 
> -- 
> 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
>



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