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Unread 06-20-2003, 04:49 AM   #1
Devil_H@ck
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Dead Points

I was searching for more info about a fan's dead point, but I couldn't find any.
Maybe you guys could help me?

I was just wondering how far away I should position my fan from my Alpha PAL to reduce the dead point to a minimum.
Is there any formula for this?
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Unread 06-20-2003, 06:42 AM   #2
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I go by the size of the center hub. The larger the center hub, the further away the fan needs to be to eliminate the deap spot. Of course, few cases provide enough room inside the case to allow much more than one inch, so that's pretty much what everone uses.

If you can mount the fan *outside* the case, you get, of course get more distance. I have a rad with a pusher/puller setup, and the pusher fan is 1-1/2 inches away, and the puller is about two inches, but the puller fan is mounted outside the case.

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Unread 06-20-2003, 10:46 AM   #3
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Hm, I'm using an Enermax fan with the large Alpha PAL P4 heatsink.
Would there be a large difference in temperature if I move the fan 2 cm?
I can move it more I think, I've got an AOpen HX08.
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Unread 06-20-2003, 12:46 PM   #4
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I don't think you'd notice much of a change by moving the fan away from a heat sink unless you had a duct that guaranteed the air was bing pulled over the fins of the sink.
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Unread 06-20-2003, 01:40 PM   #5
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Ok, nevermind then.
Thanks anyway.
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Unread 06-20-2003, 03:26 PM   #6
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Welcome to procooling, bty
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Unread 06-20-2003, 04:45 PM   #7
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Welcome!

First of all, in what direction is the fan blowing air?

By spec, your heatsink should have the air sucked from it instead of blowing.

If that's what going on then by moving the fan will in fact reduce the deadspot (since air sucked has a laminar flow) but don't ask me how much and if performance will vary.

If your fan is pushing instead of pulling (like any other hs) than by moving the fan backward, performance could decrease since the airflow in front of the fan is turbulent. Heatsinks work well with turbulent flow but moving the fan back will not only shrink the deadspot but also reduce the airflow through the heatsink.

What I suggest you experiment with is to get rid of the shroud and mount the fan the other way round (i.e. Blowing into). Some people reported better temps this way.
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Unread 06-20-2003, 05:08 PM   #8
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Hm, I think I'm letting it blow, not sure though.
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