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Re: [EnergyPlus_Support] Variable speed pumps



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
>
>  

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