What is the source for the VAV fan power coefficients in the DOE Commercial Reference Buildings?

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The key sources for fan curves are:

• 2013 Title 24 NR ACM Manual (p.4-87)
• CEC-2003 Advanced Variable Air Volume System Design Guide Appendix 5 DOE-2 Fan Curves
• 90.1-2007 Appendix G Table G3.1.3.15 Part-Load Fan Power Equation
• ASHRAE 90.1-2010 PRM Reference Manual p3.134

The ones for variable volume fans in the Commercial Reference Buildings use the CEC-2003 reference for "Good SP Reset VSD Fan":

Created by Jeff Stein 5-5-03

These fan curves were developed using the Characteristic System Curve Fan Model developed by Stein and Hydeman. Curves include part load performance of the fan, belt, motor, and VSD.

This is based on a plenum airfoil fan on a system curve through 0.5"

"Good SP Reset VSD Fan" = CURVE-FIT
   TYPE             = CUBIC 
   INPUT-TYPE       = COEFFICIENTS 
   OUTPUT-MIN       = 0 
   OUTPUT-MAX       = 1 
   COEFFICIENTS     = (0.040759894, 0.08804497, -0.07292612, 0.943739823)

Keep in mind that these fan models have a minimum power such that the fan power will always stay above this level regardless of flow percentage.