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[EnergyPlus_Support] Re: Cubic Curve in variable speed pump


Hi James,



Maybe I?m not looking in the right place, but where exactly in ASHRAE 90.1 do you find these coefficients?



Thanks,









Dear Adrian,
Lacking actual data from the pump and VSD supplier, use the ASHRAE 90.1-recommended coefficients:
E+ Format





90.1 VSD

C1

0.203671

C2

-0.827077

C3

1.181191

C4

0.442055



James V Dirkes II, PE, BEMP, LEED AP
<http://www.buildingperformanceteam.com%3chttp:/www.buildingperformanceteam.com/>www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

From: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx <mailto:[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]>[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of <mailto:adrianchong85@xxxxxxxxx>adrianchong85@xxxxxxxxx
Sent: Wednesday, January 08, 2014 2:46 PM
To: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Cubic Curve in variable speed pump



Dear EnergyPlus Users,

I'm trying to model a variable speed pump in eplus and one of the inputs required are coefficients to the cubic curve

FractionFullLoadPower =C1 + C2PLR + C3PLR2 + C4PLR3

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