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Air flow question

post #1 of 11
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I'm trying to maximize airflow in my PC, and right now things are a little weird. I have an idea of what I'm going to do, but I wanted to run this by OCN just to see if there were any suggestions.

Basically, I want the air in my case flowing from the top back-end to the bottom front-end. There is a 120mm fan on top of my case (near the back), a 120mm fan on the top of the back of my case, and a case fan in the front bottom of the case.

I've installed two fans actually inside my case, one above the GPU and one right behind the front fan.

Right now, all of the case fans are blowing in the opposite direction I want them to: the front fan is intake, and the top case fans are exhaust. I mounted the in-case fans blowing downwards, which sort of counteracts the way the air is flowing atm. But, I'd rather change the three case fans to move in the same direction as my GPU's air than switch those two around and conflict with the way that my GPU fan is moving the air.

Does this make sense, and if so, is there anything that anyone would suggest to do differently? Does it make more sense to have airflow moving upwards even with GPU fans moving the air down? Any help would be appreciated. Thanks.
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post #2 of 11
hot air rises,

so usually, you want to vent it up, so its not lingering in your case and if u vent it up, its not gunna get sucked back in by another fan
   
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post #3 of 11
firstly is your PSU top or bottom mounted in your case and does it impact on airflow or does it's airflow not enter the case like mine (Intakes from underneath and exhausts out the back)

Next by doing this air flow you will not reap the natural physical benefit of heat rising which is why the airflow is designed the way it is. Heat rises so does the airflow in the system. I think airflow coming from the front or even better the base of the case makes the most sense. Cases seems to be poorly designed in terms of airflow so I see why you would try to make it better but this might not be the right way.

I myself am designing a case where are comes in the bottom and goes out the top for little complication Alse when you are modifying airflow be careful you don't stop adequate cooling to certain parts of your system. This can happen without thinking most commonly when someone puts on a watercooling cpu block and doesn't realise that by doing that they stop the normal cooling for the parts around the CPU that would normally be cooled by the CPU heatsink fan airflow. Do you not have side case fan slots?
post #4 of 11
Thread Starter 
I guess what I'm most worried about is what's happening to the heat from my GPU. I can't turn those fans around, and they give off a lot of hot air. Do you think it'd make it worse if I vented toward the front? This is purely from a GPU standpoint-- I'm not a heavy CPU overclocker because I don't get much out of the extra speed, but I care very much about OCing my GPU. So, most of this is to make sure that my GPU is staying cool. Just wondering which way would actually make that specific piece of hardware stay cooler. Should have said that in the OP. Thank you for the quick response.
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by trimak View Post
firstly is your PSU top or bottom mounted in your case and does it impact on airflow or does it's airflow not enter the case like mine (Intakes from underneath and exhausts out the back)

Next by doing this air flow you will not reap the natural physical benefit of heat rising which is why the airflow is designed the way it is. Heat rises so does the airflow in the system. I think airflow coming from the front or even better the base of the case makes the most sense. Cases seems to be poorly designed in terms of airflow so I see why you would try to make it better but this might not be the right way.

I myself am designing a case where are comes in the bottom and goes out the top for little complication Alse when you are modifying airflow be careful you don't stop adequate cooling to certain parts of your system. This can happen without thinking most commonly when someone puts on a watercooling cpu block and doesn't realise that by doing that they stop the normal cooling for the parts around the CPU that would normally be cooled by the CPU heatsink fan airflow. Do you not have side case fan slots?
PSU is bottom-mounted so it doesn't affect airflow. I have side fan slots, but I mounted the fans inside the case thinking it would give me a little better airflow, and it did end up cooling my GPU better, which, as I said in a previous post, is what I'm mainly looking for.

I've thought about the hot air rising principle...and it makes sense for air to flow that way. I'm just confused as to what to do about the GPU heatsink/fans. It seems counterproductive for them to blow downwards if heat is being directed upwards, and was wondering if it would help or hurt to change the direction. Just not sure which would be better :O
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post #6 of 11
dont blow the air "downward" blow it outward, IE

side panel fan, set it to exhaust (least likly option)
Have a Push pull set up on the front and back of ur case, meaning, the front of the case (where your dvd drives is) pushes air in, that air goes past the GPU(s) andhave a fan pushing it out the back, , thats least likly option, due to space, im familiar with your case, so if u need to, have your front fan, pushing out, and have a internally mounted, or if u can fit them tiny 50mm fans just making air flow, mixed with a side panel, should be good.
   
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post #7 of 11
Quote:
Originally Posted by ggoodd View Post
hot air rises,

so usually, you want to vent it up, so its not lingering in your case and if u vent it up, its not gunna get sucked back in by another fan
Your are correct, hot air rise's. Case fans change this though. hot air will go where it is pushed, provided you have enough CFM to push the amount of heat your working with. Play with a hair dryer
Quote:
Originally Posted by ggoodd View Post
dont blow the air "downward" blow it outward, IE

side panel fan, set it to exhaust (least likly option)
Have a Push pull set up on the front and back of ur case, meaning, the front of the case (where your dvd drives is) pushes air in, that air goes past the GPU(s) andhave a fan pushing it out the back, , thats least likly option, due to space, im familiar with your case, so if u need to, have your front fan, pushing out, and have a internally mounted, or if u can fit them tiny 50mm fans just making air flow, mixed with a side panel, should be good.
Why dont blow air downward?

My case flow is a little odd, Top,front,side,and bottom intake, with NO fans acting as exhaust. My rear exhaust fan hole is empty, letting the air from the cooler find its way out, the PCI slot covers have been replaces with free flowing ones, allowing air that normily gets traped between a bottom nount PSU and GPU to be pusshed out the back by a fan hanning of my HDD cage.

When you add fans to a small enclosed box you can do some crazy things, due to the fact that my GPU is pretty darn big, I used it to have two "zones" of airflow, Temps are great!

My best advice to OP is to just start playing with fan placement, its hard to gauge how a air flow set up will affect YOUR rig, every pice changes it some. I like the idea of reverse flow, if you have a free flow front design, make sure there is a clear path for air to find its way out...exhaust fans turn the PC case in to a baggless vaccume. My PC has NO dust problems
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post #8 of 11
You run your air flow from front to back. Exhasut out the to top and rear. Your way is going to mess things up as hot air rises. It is almost like your forcing air to move against itself. Cases are designed for airflow to move for a certain reason. Use it and you will never be put into a rough spot.
Edited by Lord Xeb - 5/10/11 at 12:09am
 
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Gsvlip Dudyrm
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post #9 of 11
Quote:
Originally Posted by 5outh View Post
I guess what I'm most worried about is what's happening to the heat from my GPU. I can't turn those fans around, and they give off a lot of hot air. Do you think it'd make it worse if I vented toward the front? This is purely from a GPU standpoint-- I'm not a heavy CPU overclocker because I don't get much out of the extra speed, but I care very much about OCing my GPU. So, most of this is to make sure that my GPU is staying cool. Just wondering which way would actually make that specific piece of hardware stay cooler. Should have said that in the OP. Thank you for the quick response.
I understand your concern fully. Your graphics card (MSI GTX560 Ti Hawk) dumps at least half of its heat inside the case. This heat must be extracted out of the case as efficiently as possible. IMHO, the best escape route for this heat is through the top case exhaust fan. See red arrows in pic 1 below.

I suggest keeping the stock configuration of your Rosewill Challenger, with a few important modification:-
As you are using stock Intel HSF, this means it is the downward blowing type. This means that after hot air is exhausted by the hawk into the case and is being pulled upward, the hot air might be sucked into the CPU HSF. Obviously this re-circulation gives negative impact to your CPU. To prevent this and, at the same time, to enhance the cooling to your CPU, I suggest you to install a 120mm intake fan to the upper fan opening of the side panel. Additionally, use an air duct/air guard (see pic 2 ) to 'hover over' your stock Intel HSF in order to focus directly fresh air to the HSF (see the green arrows in pic 1). This is an essential step. With this fan and air duct deployed, hot air from CPU will escape through the top and rear exhaust fans (orange arrows).

Last, install a 120mm intake fan to the lower opening of the side panel to increase fresh air supply to the card.


Edited by windfire - 5/10/11 at 1:02am
post #10 of 11
Quote:
Originally Posted by Lord Xeb View Post
You run your air flow from front to back. Exhasut out the to top and rear. Your way is going to mess things up as hot air rises. It is almost like your forcing air to move against itself. Cases are designed for airflow to move for a certain reason. Use it and you will never be put into a rough spot.
go play with a hair dryer...if you add fans hot air dosnt rise, it is moved.
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