Can someone explain how does this work?

[Tadas]

Hello everyone!

 

I thouhgt I understand water cooling systems, but lately I have been thinking about it, and I got some stupid questions, which one of these is the best? Does all of them even exist? How are they called? Thank you for your answers in advance ) 

 

P.S. I know I have mad MS Paint skills

[Jaybird]

1 and let me explain. 

 

you want to get hot air out as fast as possible. you will inadvertently suck in cool air through cracks and open grills. second, you want fans in a pull config so you can blow the dust off the rad more easily. which means you dont have to pull the fans off to dust off the rad. 

[Freaky_spider]

4 or 1 

 

wont make that much of a difference

[NUFCThomas]

1 or 4 are the best depends if you want more cool air pulled in or more hot air thrown out

[Clear17Mud]

the fourth one is the best because you should not blow hot air on the whole rest of the system

 

and if the fans are nice I want to see them fans

 

but if the fans are noctua then stick them in the top like the first one

[Tadas]

1

 

 

1 for sure

 

What about them? can you explain more? why? how? :DD

[Rorgash]

i pick 2, because id rather force all the air out back, but 4 would be best if you use a blower cooled GPU, otherwise i want FULL air pressure on my gpu

[Toddwjp]

1 as long as its not negative pressure

[Guest Kloaked]

1

 

 

4 or 1 

 

wont make that much of a difference

 

 

1 or 4 are the best depends if you want more cool air pulled in or more hot air thrown out

 

He's got a rad at the top. It needs to suck in air and not spit out air that's potentially heated by the GPU's.

 

Unless I'm not understanding something.

[Tadas]

i pick 2, because id rather force all the air out back, but 4 would be best if you use a blower cooled GPU, otherwise i want FULL air pressure on my gpu

 

 

1 as long as its not negative pressure

Which one is pull or push?

[Jaybird]

What about them? can you explain more? why? how? :DD

i edited. i wanted that first post spot

[Clear17Mud]

question could you have it so one fan is pushing and one fan is pulling? but they are both on the same side? so one fan is getting air from outside the case and one is getting it from inside the case.

[Rorgash]

Which one is pull or push?

really doesnt matter, tests have been done and no real difference, maybe 1-2c if even 1

[Jaybird]

question could you have it so one fan is pushing and one fan is pulling? but they are both on the same side? so one fan is getting air from outside the case and one is getting it from inside the case.

question is why would you want this? it has potential to cause air circulation where you have a ball of hot air. this is a know effect that has consiqunses for helecopters. helecopters cannot stay hovering in one spot forever because the air beings to circulate which ultimately causes a loss in lift. similar affect applies. hot air will just circulate. 

[LarsReviews]

That drawing. Leonardo da Vinci would be jealous! 

[Ex0Thermic]

2

 

you want to feed cold air into your computer.

Fans work better at pushing air

and pushing cold air through the rad will cool your cpu better than using the hot air from inside you computer.

[sqwidee]

Depends on your watercooler. There are general principles to follow like 1. Getting hot air out asap or 2. keeping positive air pressure in the case...

 

...but manufacturers have push vs pull recommendations on their radiators (which are suggestions, but not bad ones). Like on the H100i it's recommended that you install the fans in pull with respect to the radiator, so this means you could use an H100i in config 1 OR 3 according to that recommendation. The problem with following that means that you can mess up the air pressure.

 

My case has 1 rear exhaust fan, a top intake radiator (pull fans), and 2 front intake fans. Seems to work fine.

[Clear17Mud]

question is why would you want this? it has potential to cause air circulation where you have a ball of hot air. this is a know effect that has consiqunses for helecopters. helecopters cannot stay hovering in one spot forever because the air beings to circulate which ultimately causes a loss in lift. similar affect applies. hot air will just circulate. 

Thank you I have always wondered because it would create even airflow so equal intake and output

[Tadas]

Depends on your watercooler. There are general principles to follow like 1. Getting hot air out asap or 2. keeping positive air pressure in the case...

 

...but manufacturers have push vs pull recommendations on their radiators (which are suggestions, but not bad ones). Like on the H100i it's recommended that you install the fans in pull with respect to the radiator, so this means you could use an H100i in config 1 OR 3 according to that recommendation. The problem with following that means that you can mess up the air pressure.

 

My case has 1 rear exhaust fan, a top intake radiator (pull fans), and 2 front intake fans. Seems to work fine.

So it is not good to do a pull configuration on h100 or h110?

[Tadas]

1 and let me explain. 

 

you want to get hot air out as fast as possible. you will inadvertently suck in cool air through cracks and open grills. second, you want fans in a pull config so you can blow the dust off the rad more easily. which means you dont have to pull the fans off to dust off the rad. 

So let me get things straight, first configuration is a PULL one and it prevents "hot air ball", overheating parts and dust residue?

[threadysparrow]

All of these seem to create negative air pressure which will bring in more dust than it will blow out. I would add a 120mm side intake fan with a dust filter to the mix. Intake fans have 2 jobs. Bring in cool air, and create positive air pressure so dust is forced out through cracks and crevices rather than being sucked up into the machine.

[sqwidee]

So it is not good to do a pull configuration on h100 or h110?

 

Pull = fans move air from the opposite side of the part over to the fan's side.

Push = fans move air from their side of the part to the other.

 

so you could do either config with a radiator, but pull is the RECOMMENDED CONFIG for that radiator. That's mostly because of how it's put together.

 

It looks like this:

 

Push:

 

Air********-->|FAN|-->|PART|-->**********Air

 

Pull:

 

Air*******-->|PART|-->|FAN|-->***********Air

 

Air goes in the SAME DIRECTION. The parts are merely in a DIFFERENT ORDER with respect to the direction of airflow.

[asquirrel]

Hello everyone!

 

I thouhgt I understand water cooling systems, but lately I have been thinking about it, and I got some stupid questions, which one of these is the best? Does all of them even exist? How are they called? Thank you for your answers in advance ) 

 

P.S. I know I have mad MS Paint skills

1. Negative air pressure (fans in pull): Fans run in extraction mode to pull air out of the case as fast as possible. Dust infiltration will be a problem, as every single crew hole, crack, joint, and coupling will be an entry point for dust. Additionally, this type of cooling requires work to be done to prevent 'air cycling'. Air cycling happens when air is shot out of an exhaust, hits a wall, or other surface, and re-enters through the intake fans. Air cycling will dramatically lessen the cooling performance of this solution.

 

2. Positive air pressure setup (fans in push). If a radiator is mounted in the front or top (rather than just fans with no radiator) then case temperatures will be slightly warmer. If you water cool your CPU but not your video card, your video card may run 1-3C warmer. Dust infiltration will not be a problem in this configuration, assuming all intakes have dust filters which are regularly cleaned, as the internal over pressure in the case will cause the excess air to want to leave through every nook and crack it can find.

 *Special note: If you have too much over pressure, it will become audible, in the form of both fan-feedback, and possible whistling from case air exists. Fan-feedback sounds just like what happens if you hold a pizza box in front of a box fan, that loud buzzing sound as the air cavitates on the blade surfaces due to compression shock. If you have an over pressure, reduce intake fan RPM or increase available exhaust surface area.

 

3. and 4. are simply the push/pull reverse scenarios of 1 and 2.

 

Push vs Pull has been gone over many times, but here is the summary:

1. So long as your fans have enough static pressure there is no cooling advantage to push vs pull.
2. Push/Pull is a waste unless you are using fans with insufficient static pressure, in which case push/pull helps reduce the static pressure needed to effectively use the radiator by using the radiator as a stator (http://en.wikipedia.org/wiki/Axial_compressor ; technically the radiator is not axial, the net-result physics are largely unchanged in spite of this) Those 'bars' you see on the back of the NF-F12 fans that aren't on the other NF-X12 fans Noctua makes? Those are stators, they are the secret to why the NF-F12s have so much more static pressure than the other fans Noctua makes (within the 120mm category)
3. Assuming that you have dust filtration BEFORE the radiator or any fans dust buildup won't be a very big problem.
4. #3 said, running your fans in pull will make them much easier to clean, and much less prone to dust buildup. Even with dust filters, dust will build up and in pull you can simply take a compressed air can or air compressor and blow through the radiator to clean the dust out. In a push configuration you have to take the fan off the radiator before you can blow out any dust. The reason removal is needed is that the dust cakes in the deadzones behind the hardened plastic parts of the fan, so blowing air on the dust basically just wedges it between an unstoppable force (the fan) and an immovable object (the radiator).

Cheers.

[Jaybird]

So let me get things straight, first configuration is a PULL one and it prevents "hot air ball", overheating parts and dust residue?

my cases all have the top as exhaust. the back can be either or, the front is an intake. typically you want positive airflow to prevent dust. it wont stop dust but it will slow it down. now I keep my rig on my desk and I have yet to have an dust problem. IMO i want hot air to get out easily and quickly and becuase hot air rises i make the top exhaust. I choose a pull config because when you do have dust build up its easier to blow air through the fans to get dust off the back of the rad than it is to blow air through a rad to get dust out from behind the fans. the difference between push and pull maybe be +/- 1-2% in performance. thats to say you most likely wont notice a change in degree based off which way you go. most people will advise against putting outside air directly to the rad into your case because that is now hot air entering a already hot case. thats not good. 

[G9x001]

question is why would you want this? it has potential to cause air circulation where you have a ball of hot air. this is a know effect that has consiqunses for helecopters. helecopters cannot stay hovering in one spot forever because the air beings to circulate which ultimately causes a loss in lift. similar affect applies. hot air will just circulate. 

 

A helicopter can't stay hovering in the one place forever because it would run out of fuel.

 

A helicopters hovering is determined by its Lift. if it can obtain lift it can hover for a unlimited time at any altitude until it runs out of fuel.