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[EnergyPlus_Support] ASHRAE fan powers

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Subject: [EnergyPlus_Support] ASHRAE fan powers
From: "Jean marais" <jeannieboef@xxxxxxxxx>
Date: Tue, 31 May 2011 03:40:39 -0000
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I know this topic has been disscussed to death, but I'm still a bit in the dark. I used energy plus results for constant fan volume maximum flow rates (assuming a pressure rise of 2000 Pa, 0.8 motor eff. and 0.7 fan eff.) as the input for my ASHRAE fan power calculation (G3.1.2.9) which spits out a rated input power after a fan efficiency and motor efficiency (0.7 and 0.8) have been applied. I then back calculate the ASHRAE fan pressure rise using the formula (trying from memory...correct me if I'm wrong Mr Dirks) dP=motor_Eff x fan_Eff x Wf(W)/Q to derive the
needed dP (delta P pressure rise) for each fan. I then re-enter the new pressure rise over the fan into energy plus and re-calculate the max air flow Q, and itterate this process hoping for a convergence.

How are others doing this to achive the rated fan power as per ASHRAE 90.1?

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