I apologize! I looked through my reference materials and cannot determine where I got those coefficients, or why I thought they were from ASHRAE 90.1. If I figure it out, I’ll post the information. Otherwise, try the calculation I have attached. It assumes:
· The design delta P varies (shown as 100 ft H2O in the example)
· Pumps normally operate above a minimum speed (shown as 30% in the example)
· They normally maintain a minimum loop pressure setpoint (shown as 8 psig in the example)
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
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