AnsweredAssumed Answered

Multiple Fans in Electronics Box causes Unrealistic Results

Question asked by Austin Lines on Sep 10, 2015
Latest reply on Sep 11, 2015 by Amit Katz

I have an electronics box where I have five external inlet fans blowing into the box at different angles (internal study). I've found that when I run the study, one or two fans overpower all the other fans, causing them not to function because the "mass flow out of fan curve's range". Also, the pressure produced in the box gets up to 19 psi with a small, 53.4mm diameter NMB DC axial fan. The opening to environmental pressure is very large, so this does not seem realistic. I've checked all the fan curves and made sure the units and numbers are correct.


Also, I've cloned the study and replaced all the fan inputs to volume flow rate inputs to match where I would expect the fans to be on their curves. The results from this study seem very realistic and the pressure rise in the box is less than .01 psi.


Please let me know if you've run into this before and let me know what you did to fix it.