Felipe Durán Palma
Felipe,
I am unfamiliar with the calculation in SI units, but recommend that you refer to a text such as the ASHRAE Handbook of Fundamentals.
For IP / US units, it looks like:
<image001.png>
You will need to determine the fan efficiency (â??ηâ?? in the equation above). For the small fan you are using, it is probably in the range 20-40%.
For a PTAC, pressure rise is normally in the range 0.20 ? 0.50 inches water column (50-125 PPascals)
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.comEnergy 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 Felipe Durán
Sent: Friday, August 24, 2012 1:11 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Fan Pressure Rise for a PTAC
Dear All,
I am wondering how to calculate the fan pressure rise for a PTAC. The max. flow rate is 0,16 m3/s = 339 CFM x 0,3 = 101 W.
Since I ve got the fan power (101 W) and the max flow rate (0,16 m3/m) ¿Does anybody knows how to calculate the fan pressure rise?
Kind Regards,
Felipe Durán Palma
Arquitecto UC, MPhil. U. Cambridge, LEED AP BD+C
Gerente de Proyectos
B-green Chile S.A.
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