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  #1 (permalink)  
Old 6th November, 2001, 01:02 AM
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Drawing air through the heatsink?

I was wondering if this matters. I currently have my YS-tech 26cfm fan blowing into the Pal 6035 I have, but I was wondering if I reversed it I'd get better cooling results.

This also made me wonder since I have a 30+CFM 80MM Sunon exhaust fan within 4 inches of the Pal/YS-tech, that my air flow drawing the air out of the back would improve if the YS-tech was drawing air towards the exaust fan, which it is NOT doing now.
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Old 6th November, 2001, 03:26 AM
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Switch it and try. Some people get better results while sucking, and some (like me ) get better results while blowing.
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Old 6th November, 2001, 04:48 AM
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Quote:
Originally posted by Super
Switch it and try. Some people get better results while sucking, and some (like me ) get better results while blowing.
Can I quote you on that?

Thanks, I guess this isn't as scientific as I sometimes make it out to be. At this point removing my fan to try it may not be such a good idea... but I forgot to try it so maybe in a week when this thing doesn't have to be on 24/7 I'll give it a go.
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Old 6th November, 2001, 10:18 AM
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You should get better results by blowing air into the heatsink - assuming that the heatsink has been well enough designed not to trap the air at its centre. Cooling needs the air's speed through the fins (aka superficial velocity) to be high. Fans perform better when they're pushing against a resistance rather than pulling against it, and the fins create a resistance to flow. Thus when blowing air into the heatsink, you should get more air in, which will cause it to move faster through the heatsink and cool better.
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Old 6th November, 2001, 03:36 PM
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Quote:
Originally posted by Kaitain
You should get better results by blowing air into the heatsink - assuming that the heatsink has been well enough designed not to trap the air at its centre. Cooling needs the air's speed through the fins (aka superficial velocity) to be high. Fans perform better when they're pushing against a resistance rather than pulling against it, and the fins create a resistance to flow. Thus when blowing air into the heatsink, you should get more air in, which will cause it to move faster through the heatsink and cool better.
Thanks, that was thoroughly explained... I think the one exception would be a 50cfn delta that may be loud, but would suck enough air through the sink to work effectively... but then it would be pushing the air right past my exhaust fan and probably filling the entire case with warmer air.
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Old 4th December, 2001, 05:07 AM
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Quote:
Originally posted by Pinky


Thanks, that was thoroughly explained... I think the one exception would be a 50cfn delta that may be loud, but would suck enough air through the sink to work effectively... but then it would be pushing the air right past my exhaust fan and probably filling the entire case with warmer air.
and that warmer air will get circulated back around and sucked right back threw the heat sync.

Rob
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Old 4th December, 2001, 11:33 AM
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Quote:
and that warmer air will get circulated back around and sucked right back threw the heat sync.
Inside an enclosed space like a computer case, that would probably happen anyway.
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Old 4th December, 2001, 04:33 PM
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Quote:
Originally posted by Kaitain


Inside an enclosed space like a computer case, that would probably happen anyway.
Yup . . .

That is why so many folks have good luck with duct work . . .

If folks don't want to do with duct work, a good alternative is a case window and smoke source to properly lay out the fan locations . . .
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Old 4th December, 2001, 05:50 PM
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hey jeff, thats an awesome idea!!! could be good for aesthetics too.............. but then u dont want the room filling with smoke, dry ice or watever
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