View Poll Results: Which way should I route air flow

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  • Suck in cool air

    9 45.00%
  • Suck out hot air

    11 55.00%
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Thread: Looking for opinions. Better to suck hot air or push cool air?

  1. #1
    Mo' Programming Mo' Problems
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    Sonicxtacy02's Avatar
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    Looking for opinions. Better to suck hot air or push cool air?

    I've got my core 2 duo pc successfully mounted in the double din of my rsx. Everything is working, but the combination of a mobo, dsatx, and monitor has the temps of the components way too high. I figured out a way to run hvac tubes to a pc fan which will route air... But which way should I route it? Should I suck cool air from the cabin or suck hot air from the din. Your opinion counts!
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  2. #2
    FLAC
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    if possible its probably best to suck hot air from the din.

  3. #3
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    +1 to Punky's thought.

    if nothing else, it allows cool air to seep in all the vents, rather than pushing hot air out through all the vents so you can direct where the hot air goes after it leaves the case.
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  4. #4
    MySQL Error soundman98's Avatar
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    i would suck the air from the area instead of forcing hvac air into it.

    i am reminded of hizacks(or whatever his new name is) build thread, where he routed some a/c ducts into the carpc armrest to cool it-- he ended up having moisture collecting on some of the carpc stuff because of the drastic difference in temps, when he would open the doors and the hot air would rush in-- i don't remember if he had issues because of the moisture at all, but i imagine that it would eventually cause problems.

  5. #5
    Raw Wave
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    If cool air was instantly cool it makes more sense to push cool air then pull hot (like in a server room). In a car thats not the case, the toughest time for a CarPC is when the car has been sitting in the sun and is first started. Internal temps of both the case and the car will be very high. Since it will take a few minutes before the evaporator is cool, you really don't have cool air you have internal temperature air. In that case, its better to suck out hot air then push warm.

  6. #6
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    Let me be clear, i'm not using the cars HVAC system.. i just meant i bought HVAC tubing from home depot. I'm just using a 120mm PC fan at this point. I've actually got a larger 12v fan i could use too but i'd have to route the tubing all the way to the trunk.
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  7. #7
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    i still think that it would be better to pull the hot air out-- because i think that it is always harder to get rid of heat than it is get cool air to components.

    now, i have heard certain aguments both for and against the effect of keeping positive air pressure in the enclosure-- some say it doesn't matter, others say that neg air presure hurts things... i think i can see reasoning for both-- so i would say keep a even air pressure on both sides-- ie: a fan blowing in, and a fan blowing out.

  8. #8
    The Last Good Gremlin GizmoQ's Avatar
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    In the summer months you're gonna need both, you can get away with pulling the heat out in the winter.
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  9. #9
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    negative air pressure will cause dust to accumulate much faster than positive air pressure. for that reason i'd set up the fans to mostly blow outward. don't worry about hooking it up to your hvac for the reasons mentioned above.

  10. #10
    Raw Wave
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    Suck in & suck out?
    Don't you mean blow in cool or suck out warmer?

    Usually cold air is blown in and targeted at the areas that need cooling - it isn't as easy targeting suction.
    But I'd argue no fixed answer - it depends on the arrangement.

    Condensation should not be an issue - it should have been taken out beforehand, but should not condense on warmer surfaces anyhow.
    But like condensation, dust is a conformal (coating) issue, though it may be sucked out better than blown out - but some will stick anyhow - whether electrostatically or otherwise. (Could fit filters, but I prefer conformality over blocked filters!)

    Whether positive pressure in or negative pressure out is irrelevant - all the volume sees is the pressure differential. However how it moves, eddies and streamlines is a issue - and that's determined by intake, outtake & between.....


    Another non-specific from yours truly.

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