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Electronic equipment cooling.
3

Electronic equipment cooling.

Electronic equipment cooling.

(OP)
I have an electronic device that runs off of 400 Hz power and dissipates 350 watts of heat. It has
a thermostatically controlled fan that kicks in to provide cooling. The problem is that the 400 Hz
fan is extremely loud. My plan is to duct refrigerated air into the intake opening in the side of the
unit in an attempt to prevent the 400 Hz fan from every kicking on. My experience with cooling
systems is very limited and I require the appropriate equations to calculate the cooling of the
proposed system.

q=h(Tout-Tin) doesn't really tell me straight out that a 600 cfm air flow at 55 degrees F is
sufficient. My guess is that it will work but I would like some confirmation please.

RE: Electronic equipment cooling.

3
q=1.08xCFMxDeltaT (BTU/Hr)
(0.24 Btu/LbAirx60sec/minx0.075Lb/ft3=1.08)
therefore: q=1.08x600x(75-55)/3.413 BTU/Watt = 3800W
Keep in mind that you've got about a ton of cooling to cool 3 lightbulbs! If your delta T is higher then you even have more!

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