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[EnergyPlus_Support] Re: Fan and Pump Efficiency

Is Delta Pressure the static or total pressure rise? 
Normally static is measured, but it is not explicitly stated.

Regards,

Jean Marais

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "JV Dirkes II" <jvd2pe@...> wrote:
>
> 
> Dear Mr / Ms Herrmann,
> 
> Fans can have separately assigned efficiencies for the fan and motor, as
> shown in the sample object below.
> 
>    FAN:SIMPLE:VARIABLEVOLUME,  Fan Name RFan_AH1,  Available Schedule
> SchCpct_FanOpern,  Fan Total Efficiency 0.6,  Delta Pressure 1,  Max
> Flow Rate Autosize,  Min Flow Rate 0,  Motor Efficiency .91,  Motor In
> Airstream Fraction 1,  FanCoefficient 1 .0013,  FanCoefficient 2 .147, 
> FanCoefficient 3 .9506,  FanCoefficient 4 -.0998,  FanCoefficient 5 0, 
> Fan_Inlet_Node NodeOut_EA_AH1,  Fan_Outlet_Node NodeIn_OA_AH1;  End-Use
> Subcategory
> 
> Pumps, however, combine the efficiencies of motor and pump into a single
> value which is somewhat poorly identified as "Motor Efficiency".  Since
> the combined value is static, this is not a big concern.  It does,
> however, force a separate calculation to combine the motor and pump
> efficincies into a single value for pumps.
> 
>    PUMP:VARIABLE SPEED,  Pump Name HtgWtr Pump_1,  Inlet_Node Node_HtgWtr
> SupplyInlet_In,  Outlet_Node Node_HtgWtr Pump1_Out,  Rated Volumetric
> Flow Rate 0.0076,  Rated Pump Head 179165,  Rated Power Consumption
> 2350,  Motor Efficiency 0.895,  Fraction of Motor Inefficiencies to
> Fluid Stream 0,  Coefficient1 of the Part Load Performance Curve
> 0.203671,  Coefficient2 of the Part Load Performance Curve -0.827077, 
> Coefficient3 of the Part Load Performance Curve 1.181191,  Coefficient4
> of the Part Load Performance Curve 0.442055,  Min Flow Rate while
> operating in variable flow capacity 0.0023,  Pump Control Type
> CONTINUOUS,  Pump Flow Rate Schedule Name SchCpct_AlwaysOn;
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, L Herrmann <l.herrmann@>
> wrote:
> >
> > Hello,
> >
> > I was wondering about how to adjust pump and fan efficiencies in EP. 
> For example, to change the efficiency of the pump motor, would one need
> to create an entirely new pump with a higher efficiency which meets the
> flow rate and head of the system?
> >
> > Thanks
> >
>




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