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Re: [EnergyPlus_Support] VAV System Part Load Fan Power Curve Difference between DOE Reference Model and STD90.1
you are of coarse correct. sorry. You'll have to ask someone who was involved. you could try Michael Rosenberg at Pacific Northwest, or post it on the LEEDuser forum in EAp2. Some of those chaps may know.
2014-02-27 19:46 GMT+01:00 <<mailto:xukevin24@xxxxxxxxx>xukevin24@xxxxxxxxx>:
> Â
I noticed there is a difference between part-load fan power equation defined in ASHRAE Standard 90.1- Appendix G (2004/07/10) and the fan curve included in the DOE reference models (e.g. newly built (2004) medium sized office building E+ model) for VAV system. ASHRAE 90.1 seems more conservative on the part load performance. Anyone here knows where DOE reference model get the part-load equation from?
> Thanks much!
> -Ke Xu, Ph.D., BEMP, BEAP
> In DOE reference model for medium sized office bldg:
 Fan:VariableVolume,
  VAV_1_Fan,        !- Name
  HVACOperationSchd,    !- Availability Schedule Name
  0.5915,          !- Fan Efficiency
  1109.648,         !- Pressure Rise {Pa}
  AUTOSIZE,         !- Maximum Flow Rate {m3/s}
  FixedFlowRate,      !- Fan Power Minimum Flow Rate Input Method
  ,             !- Fan Power Minimum Flow Fraction
  0.0000,          !- Fan Power Minimum Air Flow Rate {m3/s}
  0.91,           !- Motor Efficiency
  1.0,           !- Motor In Airstream Fraction
  0.0407598940,       !- Fan Power Coefficient 1
  0.08804497,        !- Fan Power Coefficient 2
  -0.072926120,       !- Fan Power Coefficient 3
  0.9437398230,       !- Fan Power Coefficient 4
  0,            !- Fan Power Coefficient 5
  VAV_1_HeatC-VAV_1_FanNode,  !- Air Inlet Node Name
  VAV_1 Supply Equipment Outlet Node,  !- Air Outlet Node Name
  Fan Energy;        !- End-Use Subcategory
ASHRAE 90.1-2004, 2007, 2010 Appendix G has:
Pfan = 0.0013 + 0.1470 x PLRfan + 0.9506 x (PLRfan)^2 -0.0998 x (PLRfan)^3
where
P fan = fraction of full-load fan power and
PLRfan = fan part-load ratio (current cfmldesign cfm).
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