| Modeler's Description | This measure changes the polynomial curve coefficients and minimum fan power that define the fan power performance curve for Fan:VariableSpeed objects in EnergyPlus. Curve coefficients come from ASHRAE Standard 90.1-2016 Performance Rating Method Reference Manual Table 50 Fan Curve Default Values (identical to ASHRAE 90.1-2010 PRM Reference Manual Table 47). The OpenStudio default is "Multi-zone VAV with static pressure reset". The default is originally sourced from a 2003 California Energy Commission report, "Advanced Variable Air Volume System Design Guide" Appendix 5 - DOE-2 Fan Curves, which were created by Jeff Stein and Mark Hydeman from their fan curve model, detailed in "Development and Testing of the Characteristic Curve Fan Model" ASHRAE Transactions. 2004, Vol. 110 Issue 1, p347-356. 10p. The default assumes "Good Static Pressure Reset", and this measure also includes curve coefficients for "No Static Pressure Reset", "Typical Static Pressure Rest", and "Perfect Static Pressure Reset" (Single zone VAV fan) as detailed in the 2003 CEC report. The ASHRAE 90.1 Appendix G default is also included, which assumes no static pressure reset, and is sourced separately (identical across ASHRAE 90.1-2007,2010,2013,2016). Note that the PRM baseline is the OpenStudio default, which is different from the Appendix G baseline. Source documentation is included in the resources folder of this measure. |
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