Push pull config

[kttdkt]

Does anyone know if a setup like this would work good?

[kttdkt]

Also I have 2x 80mm (weak) fans and 2x 120mm Thermalright (strong) fans. Which ones should I have pushing and which ones should pull?

[Intrepid]

I would not recoment it because hot air going out of the top fan on one side might also get sucked back thru by the bottom fan and vice versa. it's better not to draw air from the same air space that you exaust too if ya know what I'm saying.

[kttdkt]

yea, i hear ya. But do you know if I should make my 120mm fans push and my 80mm pull? or vice versa?

[WyrmMaster]

Id say build a shroud (cardboard works fine) and put one 120mm on each side, with the shroud to make sure you are drawing air accross the entire radiator.

[lazerin]

To maintain the push pull factor, build a shroud on both sides with one fan pulling and one pushing.

[DodgeViper]

This article I wrote may help you build a shroud. You may need to adjust the size to fit your rad. CLICK (http://www.dwpg.com/content.php?contid=3&artid=134)

Use 120mm fans in a push/pull configuration. Buy doing so you will have a true CFM going across the rad. Use fans of equal CFM.

[Gandalf]

I was talkin to Maskedgeek last night and he was doing a test with a Pus and Pull setup. He said that there was no difference between the two.

I don't think he has compared the Push AND Pull agains the Push alone and Pull alone.

[JFettig]

yeah gandalf is rite, the performance stayed the same when it comes push vs pull, but i didnt have the stuff to do push and pull at this time

[DodgeViper]

Well I have done testing and there is a difference. I ran just the push, <<< rad-fan-front of case. Arrows shows the direction the air is moving. In this setup my temps were 2c above my <<< fan-rad-fan-front of case. Next was to try this method, <<< fan-rad-front of case. Temps using this method were 3c above my current setup. You will get a true CFM across the rad using fan-rad-fan and your cooling will be lower.

[Since87]

Originally posted by DodgeViper
Well I have done testing and there is a difference. I ran just the push, <<< rad-fan-front of case. Arrows shows the direction the air is moving. In this setup my temps were 2c above my <<< fan-rad-fan-front of case. Next was to try this method, <<< fan-rad-front of case. Temps using this method were 3c above my current setup. You will get a true CFM across the rad using fan-rad-fan and your cooling will be lower.

Were you comparing 2 fans pulling to 1 pulling and 1 pushing?

Can you give a little more detail? In any of these tests, was there an unpowered fan obstructing airflow?

[JFettig]

just look at his avatar.....

[DodgeViper]

Since87,

Why would I have two fans pulling? If you read above you would see I explained what I had tested. Arrows show direction of AIR flow.

<<<fan/rad/front of case<<< = + 3c over the push/pull temps.

<<<rad/fan/front of case<<< = + 2c over my push/pull temps.

During the test all fans that were NOT being used were removed from my setup. So to answer your question no non-running fans were obstructing airflow during the test.

My current setup is just like in my avatar.

<<<out the back of case<<<fan/rad/fan/front of case<<<

[Since87]

Sorry, I had avatars turned off.

I've got a large heater core I am building into a WC system. (6"X10") It won't be in the PC case. It is big enough for 2 120mm fans side by side pushing or pulling. My belief is that 2 fans pulling would be more effective (from a noise standpoint as well as cooling) than 1 pushing and 1 pulling in this case. I don't really know though, and haven't seen any hard data on the subject. That's why I asked.

[DodgeViper]

Either way if you’re pushing or pulling through a rad the given CFM rating of the fan you use will not deliver the rated CFM through the rad. By placing a fan on either side in a push/pull format helps raise the CFM that is passing through the rad, but does not double the CFM, it only stabilizes so the correct CFM is passing. I use two PanaFlo 86 cfm 120mm fans in a push/pull format.

In my system my 120 fans are quiet. With you having a larger rad being outside of the case you very well may get away using just a push or a pull. Remember your not going to cool below the ambient temp of the room your computer resides in. I prefer to have my system contained within the case and not have something that is not moveable. Good Luck!!!

[Since87]

Originally posted by DodgeViper
I prefer to have my system contained within the case and not have something that is not moveable. Good Luck!!!

I'm not interested in moving my computer. If computers were meant to move they'd have batteries.:D

I'm an old fart by this site's standards. I'm not going to be going to any LAN parties. The first time I overclocked a computer was in 1987, hence the screenname. ( I got a 50% increase in processor and memory bus speed, on a multitasking computer that was connected to 4 dumb terminals and cost under $10K. A nickel to the first person who can guess the manufacturer, model, and operating system. )

Anyway, I want to get as much of the heat outside the case as possible, therefore the rad, the pump, the pelt PS and control circuitry are going outside the case in their own box. The fans will be pulling air through the radiator and blowing air over the pelt supply.

[DodgeViper]

Well I don't go to LAN parties and I too would be and old fart at 45 years in this forum, but I do like to take the computer to my shop and air it out with nitogen to remove all the dust that seems to pass this dust bowl called Tucson, Arizona. You know, where all the tumble weeds grow.