Airflow question.

[phongle123]

So I've had this question for a while.

 

Consider an average case.

If you place 1 radiator in the front and 1 radiator on the top to properly accommodate CPU and GPU within a custom loop to exhaust.

This only leaves room left for 1 fan to be placed on the rear for an intake.

 

This world mean that there would be 4 fans exhausting out radiator hot air and only 1 fan intaking air to the case.

So the amount of air being exhausted in 4x the amount being taken in. How does that affect air circulation. That would mean that you'd have to make 1 of the radiator fan sets to be intaking air but wouldn't that be counter productive by blowing hot air into the case rather than the outside? But this would make it be 2 exhaust and 3 intake even if 2 of them are blowing hot air into the case.

[Skiiwee29]

I would personally have the front radiator as intake and the other 3 as exhaust. Thats just me though. 

[phongle123]

5 minutes ago, legacy99 said:

 

I would personally have the front radiator as intake and the other 3 as exhaust. Thats just me though. 

I understand where you're getting at as the front location is the best spot to put intake fans and rear/top are better for exhausts. But I want to know outright because, IMO the point of Liquid Cooling is it's ability to transfer hot air out of the case and keep the whole case cool, so the components that aren't part of the custom loop are also kept cooler. Therefore, longer lifespans of all components of the CPU, however miniscule.

 

But don't think I've found a video comparing Liquid Cooling fan setups. I know there is a video about air cooling fan setups and how that affects temperatures of CPU/GPU by LTT comparing both intake/exhaust.

[Light-Yagami]

This is what you want to do. Front rad is INTAKE, and top rad is EXHAUST. back fan can be intake but have a dust filter if you plan to do it that way. 

Why is front rad intake? because You've got to have close to neutral airflow. (same amount into the case and same amount out. Better to have it a bit more comming into the case IMO. You'll probably want the top rad to get the water first or sth.. I don't know if you're having all in the same loop or are you having seperate loops..

[Sack]

First of all before thinking about airflow questions this configuration would entail, I think we'd all benefit if you had a look at this here (not trying to be rude, just makes your posts much easier and more plesant to read). By using the front rad as intake you are taking hot air into the case, yes. However if you set top as exhaust we could say that we're "canceling out" that because we're exhausting that air by not letting the hot air linger inside your case. What to do with the last fan? That would be have to be up to you.

 

That being said, the heat dissapated into your case is not harmful to your computer components, they are designed to "live" in an enviroment where temps 20-40 (maybe even 60) degrees (celsius) is the norm, intel even said that their CPUs are meant to operate at around 80-90 degrees... so there's that.

[PrimeSonic]

I just finished up my loop. I have a radiator in every since fan location, intake or exhaust.

My temps are fine all around.

 

Don't worry so much about where the radiator exhausts its air. It's not nearly as hot as you think it is.

[phongle123]

2 hours ago, Sack said:

--

Is this English class? Am I writing an essay? No it is not. I spaced out my comments with a period for each one. Not merging anything together. Only you cannot understand it. Then there's also the fact that you completely did not read what the post was about. Therefore, you were just here trying to read an essay and didn't care about the content. Please don't try to be all knowing when your post blatantly shows otherwise. Just because a component is able to run at let's say 100C, doesn't mean you want to be running it at 90C-99C when you're able to run it 80C-89C.

[phongle123]

4 hours ago, Light-Yagami said:

This is what you want to do. Front rad is INTAKE, and top rad is EXHAUST. back fan can be intake but have a dust filter if you plan to do it that way. 

Why is front rad intake? because You've got to have close to neutral airflow. (same amount into the case and same amount out. Better to have it a bit more comming into the case IMO. You'll probably want the top rad to get the water first or sth.. I don't know if you're having all in the same loop or are you having seperate loops..

 

2 hours ago, PrimeSonic said:

I just finished up my loop. I have a radiator in every since fan location, intake or exhaust.

My temps are fine all around.

 

Don't worry so much about where the radiator exhausts its air. It's not nearly as hot as you think it is.

So it looks like my original thought was more or less correct. Since it is custom looped, I don't think the hot air from the Radiator pushing inside of the case will be hot enough to pass the tubing to affect the temperatures inside of the tubing. So the temperature inside the case shouldn't affect the temperature of the components inside the loop.

 

This may sound like a stupid question, but considering all are the same fans running the same RPM. Do all sides, rear/top/front pull the same amount of air in because they are the same fans running the same RPMs. Or is the front pulling in more air where the most unrestrictive part of the case is? For example, when the case is put inside a cabinet or enclosed space.

[PrimeSonic]

2 minutes ago, phongle123 said:

This may sound like a stupid question, but considering all are the same fans running the same RPM. Do all sides, rear/top/front pull the same amount of air in because they are the same fans running the same RPMs. Or is the front pulling in more air where it is the most unrestrictive part of the case when the case is put inside a cabinet or enclosed space?

There are no stupid questions. Only stupid doughnuts.

 

Yes, radiators will restrict air-flow. So if you're trying to work out the positive or negative air pressure in your case, then radiators will impact that.

 

In this way, you could end up in a situation where you have more exhaust fans than intake fans and still have positive air-pressure if the exhaust fans are going through radiators.

 

If you've got unobstructed intake fans, feel free to leave them at the same RPM as the exhaust fans on your radiators. Positive air pressure is typically desirable and won't have any negative effects to your cooling situation.

[phongle123]

19 minutes ago, PrimeSonic said:

There are no stupid questions. Only stupid doughnuts.

 

Yes, radiators will restrict air-flow. So if you're trying to work out the positive or negative air pressure in your case, then radiators will impact that.

 

In this way, you could end up in a situation where you have more exhaust fans than intake fans and still have positive air-pressure if the exhaust fans are going through radiators.

 

If you've got unobstructed intake fans, feel free to leave them at the same RPM as the exhaust fans on your radiators. Positive air pressure is typically desirable and won't have any negative effects to your cooling situation.

So, the only course of action would be if I wanted to have all Radiator fans be exhaust. So my non-looped components stay a cool as possible. I'd have to get a bigger case with more fan slots to add intake fans.

 

Back to what you stated. I don't know how I would began to search this up. So considering the same 2 fans are used. For example the Noctua A-14 PWM fan with Low Noise Adaptor to make the fans run at 800 RPM. With the L.N.A. the fan has a Static Pressure of 1,51 mm H₂O. So if both fans were used, the 1st as a case fan and the 2nd as a radiator fan. Again both running at 800RPM with the Low Noise Adaptor. What would be the percentage loss of air intake/exhaust difference when using it as a Radiator Fan when compared to using it as a case fan?

How about the same scenario but replace the Case Fan with an Air Flow fan instead of a Static Pressure fan. With the fan still running at 800 RPM.

[PrimeSonic]

I will first share with you this to hopefully cover any lingering questions you may have about setting up a particular airflow in your case with radiators involved.

And then, all I can really recommend is this:

Assuming your exhaust fans are all going through radiators, set those at the speeds you want while playing around with the speeds of the intake fans until airflow is where you want it to be.

You can test and experiment using smoke as demonstrated in the video.

[Sack]

11 hours ago, phongle123 said:

Is this English class? Am I writing an essay? No it is not. I spaced out my comments with a period for each one. Not merging anything together. Only you cannot understand it. Then there's also the fact that you completely did not read what the post was about. Therefore, you were just here trying to read an essay and didn't care about the content. Please don't try to be all knowing when your post blatantly shows otherwise. Just because a component is able to run at let's say 100C, doesn't mean you want to be running it at 90C-99C when you're able to run it 80C-89C.

I pointed out that I was not trying to be rude, however your reply is very agressive towards someone who was only pointing out that basic literacy, will help you get your point across! Reading through the replies, leaves me with a feeling that you did not, in fact, achieve this. Believe me, your writing leaves much to be desired, however this is a forum and not essay writing, and so pointing out all the flaws of your writing would be pointless, and not beneficial at all. Using commas effectively, will benefit US, the people trying to answer you or help you.

 

Now, I did not say that you would want to leave your components running at 90 degrees C, the point I was making however was that the temperature that you would normally get inside your case with the configuration I mentioned, will not have any detrimental effects on your components. HDDs e.g. are components that obviously shouldn't be overly hot, but I seem to remember the manufacturers saying that 20-30 degres would be good for them, the comment about CPU temps is just refering you information from Intel, the people who make CPUs. They probably know more about it than you ever will, and if Intel tells us that their CPU can run at 80 degrees no problem, then why argue?

 

Don't be so angry man, chill (see what I did there? I used a comma).