How to do airflow analysis of a fan-cooled electronics enclosure?

[Tunalover]

Does anyone out there have a reference showing how to calculate the volume flowrate (cfm) vs. static pressure (inches water) curve for an aircooled electronics enclosure? This would involve consideration of duct losses due to expansion, contraction, splits, turns, etc. Years ago I saw where someone started with Bernoulli's equation but I can't seem to put my hands on it anymore.

My goal is to determine the enclosure's operating point given the fan's published static pressure vs. flowrate curve; I want to overlay the two curves on the same graph and find the intersection (the operating point).

I've been able to find plenty of sources who talk about doing the above but haven't been able to find a source that actually DOES it and shows how to do it!

Thanks in advance for your help!

Regards,
Tunalover

 

[anotherpipeguy]

This Link may help you some, I'll be back with more later.

http://www.hvacbooks.com/duct_calculator.htm

 

[Tunalover]

anotherpipeguy-
Thanks for the link but it only provides losses through straight runs of duct. These I expect to be "down in the noise" when turns, expansions, and contractions are taken into account.
Tunalover