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Re: [EnergyPlus_Support] VAV System Part Load Fan Power Curve Difference between DOE Reference Model and STD90.1
Are you using the SI version of the standard? Sometimes there are rounding errors. Consider the IP standard the 'master'.
Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23
On 27.02.2014, at 19:46, <<mailto:xukevin24@xxxxxxxxx>xukevin24@xxxxxxxxx> wrote:
>
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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