What is meant by "Average Differential Pressure"? In my case, i have 4 janitor's closets and a recycling room on the same fan. There is no supply air served to these spaces, all make-up air is brought in from the undercut of the door. The fan will operate continuously so using the ASHRAE equation for Differential Pressure (∆P) in PA (Q=165.5*A*√∆P) for both the minimum and average differential pressures will yield the same result which is under 5 PA but more than 1 PA. is there a different equation to use or different parameters?
Thank you for your time in advance.
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Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
January 24, 2014 - 9:06 pm
This question was asked twice - I thought I'd copy up the answer:
Stephen,
Average is sort of your typical case. It sounds like your average and minimum are the same case because your system is constant volume.
It is perfectly fine to use the same fan for the 4 janitors closets and recycling room. Just indicate what each space should be balanced to on your plans based on meeting 5 PA all the time.