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RE: [EnergyPlus_Support] Baseline Pressure Rise


The derivation below is in IP units, but it should give you some guidance.

As an example, pressure rise of 1.28 inches w.c. or 318 Pascals produces correct fan power for Sytems 1 or 2.

For System 3 or 4, it’s 3.32 inches w.c. or 826 Pa (No pressure credit)

For Systems 5 ? 8, 4.59 in. w.c. or 1142 Pa (No pressure credit)


ASHRAE 90.1 Appendix G Fan Delta P Derivation (IP units)

ΔP =


η x 6356



(CFM x Fs +

ΔPcf x CFM / 4131)

x η x 6356

substituting BHP from


ASHRAE 90.1 Table


(Fs + ΔPcf / 4131) x

η x 6356


Fs is the factor dependent on Baseline system type

ΔPcf is the pressure drop adjustment (It is not applicable to Systems 1 or 2)






James V Dirkes II, PE, BEMP, LEED AP
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653


From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Ivan Mezzacapa
Sent: Tuesday, April 16, 2013 7:47 PM
To: energyplus_support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Baseline Pressure Rise





how can i calculate pressure rise for baseline model?



Téc. Ivan Mezzacapa

Desenhista Projetista  de Ar Condicionado / Consultor de Eficiência Energética em Ar Condicionado

Celular: (11)9963-9326


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