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post #161 of 2110
What an awesome thread. I'm a hardcore air cooling/ silence freak. I've been thinking about flipping the top 140mm fans in my tempest for a while now and after reading this I really need to test it out. I see a lot of people blocking one of the top fan holes but are there any test's that show this is better then having a intake fan there? Also I don't see much talk about dust filters and how much they reduce air flow and generate noise.
Edited by Bit_reaper - 8/1/11 at 7:45am
    
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post #162 of 2110
I got myself an infrared thermal reader and it measured 3-4 degrees C difference of the air going in the front of my case and coming out the back exhaust when it is idle and cpu is around 30~C ambient temps of 23C

under load cpu temps are 55-60~C and intake-exhaust difference of 6-8C

idk the point of my post but just decided to share lol.

Also, ehume, if i were to cut out the back grill, should I still have a fan to exhaust or let it exhaust on its own? I guess only testing will tell but in theory which do you think is a better plan?
Edited by chinesethunda - 8/2/11 at 7:54am
   
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post #163 of 2110
Thread Starter 
Quote:
Originally Posted by Bit_reaper View Post
What an awesome thread. I'm a hardcore air cooling/ silence freak. I've been thinking about flipping the top 140mm fans in my tempest for a while now and after reading this I really need to test it out. I see a lot of people blocking one of the top fan holes but are there any test's that show this is better then having a intake fan there? Also I don't see much talk about dust filters and how much they reduce air flow and generate noise.
Blocking off the rearward top fan position is to create a wind tunnel effect. If the rearward top fan is exhaust you get recirculation. If it is intake you may or may not get interference with your wind tunnel. OTOH, if your case has a high ceiling like a HAF X, two intakes makes sense since you can't really make a wind tunnel. So a user tried it and discovered twin intakes > single intake with rearward position blocked.

Yes, we know filters make fans work harder and therefore louder. But we consider it worth it to avoid the dust. I've tried it both ways and far prefer the filters.

Quote:
Originally Posted by chinesethunda View Post
I got myself an infrared thermal reader and it measured 3-4 degrees C difference of the air going in the front of my case and coming out the back exhaust when it is idle and cpu is around 30~C ambient temps of 23C

under load cpu temps are 55-60~C and intake-exhaust difference of 6-8C

idk the point of my post but just decided to share lol.

Also, ehume, if i were to cut out the back grill, should I still have a fan to exhaust or let it exhaust on its own? I guess only testing will tell but in theory which do you think is a better plan?
I love the IR thermometer. Great data +rep

When you remove the rear grill there is no resistance to the air getting out. That's one less fan you need, and therefore "A little less noise theah!" (Mr. Darling, from Peter Pan).
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post #164 of 2110
i see, I have great a many fans that I just have and don't mind having on there. Noise doesn't bother me at all. Would it hypothetically work better since it has no resistance?
   
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post #165 of 2110
Quote:
Originally Posted by chinesethunda View Post
i see, I have great a many fans that I just have and don't mind having on there. Noise doesn't bother me at all. Would it hypothetically work better since it has no resistance?
In tems of airflow: No rear grill + Fan > Rear grill + Fan > No rear grill + No fan > Rear grill + no fan.

Edit: Most cases dont have top exhaust, and the only way to exhaust air would be the rear grill and I think in those cases it should help something to take out all the metal that interrupts airflow.
In my case, HAF 912 it has a big 200mm right in top as exhaust and even though it has a grill aswell it takes out a ton of air that taking out the metal in both fans wouldnt make any difference at all.
Infact, when I place my hand in the air thats being exhausted by the top 200mm is warmer than the rear air that is being exhausted too.
Edited by MexGT - 8/2/11 at 3:37pm
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post #166 of 2110
Thread Starter 
Quote:
Originally Posted by MexGT View Post
In tems of airflow: No rear grill + Fan > Rear grill + Fan > No rear grill + No fan > Rear grill + no fan.

Edit: Most cases dont have top exhaust, and the only way to exhaust air would be the rear grill and I think in those cases it should help something to take out all the metal that interrupts airflow.
In my case, HAF 912 it has a big 200mm right in top as exhaust and even though it has a grill aswell it takes out a ton of air that taking out the metal in both fans wouldnt make any difference at all.
Infact, when I place my hand in the air thats being exhausted by the top 200mm is warmer than the rear air that is being exhausted too.
I'm not sure that grill+fan exhausts more air than an empty space. Some of those grills are pretty restrictive, and some of those fans are pretty weak.
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post #167 of 2110
I think of it being ... a hole = neutral pressure while air being sucked out creates negative pressure, thus more airflow out?
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post #168 of 2110
Thread Starter 
Quote:
Originally Posted by MexGT View Post
I think of it being ... a hole = neutral pressure while air being sucked out creates negative pressure, thus more airflow out?
But it may be limited in volume, where an open space can let lots of air through.
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post #169 of 2110
yeah but like ehume had mentioned before, the back of the fan on the cooler acts as the rear fan and will push all the air out
   
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post #170 of 2110
easy to check, take out the rear fan and place your hand and feel which airflow is stronger, with or without fan then you will have your answer.

EDIT: Unless someone has a manometer that could be placed inside a case or a flow meter to check the exhausting air if we want to be more scientific lol.
Edited by MexGT - 8/2/11 at 5:49pm
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