Duct cooling without a cpu fan....

[chaosdriven]

I've been asked to post a couple of pictures of my system.

First, I must give credit to Rick Talbot and his excellent article:

"The Effectiveness of Air Ducts in CPU Cooling"

(see under "case cooling") which inspired me to give this a try.

This is a futurePower case with 400Watt ps, cost=$48.00
http://www.webuildpcs.com/wbpc/CAS019.html

One useful quality of the case is that the ps is top mounted(see next picture).

A shot from outside:

1. 120mm Internally mounted left panel
2. Top 5.25 bay empty except for speed control circiut for fan, grill made from two plastic bullet holders for 22 Long Rifle bullets

[chaosdriven]

A view with side panel pulled away..

You can see the SK6- no fan!

When in place the duct end is about 1/2 inch from the hs surface.

The outlet extends about 3/4 inch lower than the hs bottom. This provides good cooling to the power mosfets.

[chaosdriven]

And a close up view of the duct.

It is fabricated from a sheet of flourescent light paneling ( Home Depot) , smooth surfaces on both sides. Plastic model cement works well. The initial construct was held together with tape prior to glueing.

Four internal bracing panels are present ( you can only see one in this picture) which give the duct some rigidity and hopefully improve air flow.

I am still working on trying improve the design. With a 170FSB the system will lock up when the room gets a bit warm and the cpu temp reaches the 50-51c range. Fully stable at 168FSB.

[Paul -The Mad Hatter]

I've always wanted to do this but aighn't that skilled

anyways whats the results?

[chaosdriven]

It works pretty well. I had hoped to be able to turn down the fan speed so that it would be quieter, and I can do that if I run it in the 1500-1550 range, it runs fine in a cool room.

I'm still looking for a higher capacity, quieter fan though which can generate higher pressures...

http://www.sunon.com.tw/index_en.htm

Sunon makes a couple that give a pretty high pressure rating:
KD1212PMSX-6A
KD1212PMBX-6A

Any idea where I could get a hold of either of these two?

[Bakeman]

that is sweet man
and thanks for posting that info

I may have to get me that case
I like that alot!!

GREAT PRICE!! 400watt with USB in front..
that is nice!!


And nice mod on that..

What if you added a fan on that Sk-6 would that help more??
or defeat the cause of the fan and duct?

[chaosdriven]

I had a Millenium Glaciator with fan on there before, with the Sunon and no duct. It worked perfectly well- the Sunon kept all the motherboard components very cool and I had excellent case ventilation.:D

[Silversinksam]

chaosdriven,


First I'd like to say that looks very sweet, I'm curious to know if you tried that mod with a Fan on the Sk-6

If you did what were the results with it

For added cfm's and 'quietness' maybe you should check out the Comair Rotron Fan, I sent one of these to a OC.com staff member for testing and maybe he will have results soon for you people.

At 5-9 volts this Comair fan is whisper Quiet and I was actually surprised at the great performance of this fan.

I also tested the AC model, but that fan is extremely noisy.
Comair Rotron Fan. It is 6 3/4" x 5 7/8". It has 7 blades. Model JQ12B4, 12 VDC


These fan can be found on Ebay [Search Comair]
Also If you search OC.com there is mention of a few vendors selling them for $8-10 dollars.

http://www.thme.com/anewebay/fans&heatsinks/comair1.jpg

[chaosdriven]

Originally posted by Bakeman
that is sweet man
and thanks for posting that info

I may have to get me that case
I like that alot!!

GREAT PRICE!! 400watt with USB in front..
that is nice!!


And nice mod on that..

What if you added a fan on that Sk-6 would that help more??
or defeat the cause of the fan and duct?

Thanks! I'm glad to post it. I wish I had a better camera!:rolleyes:

I haven't tried the Sunon120/Duct with another fan on the heatsink yet...I think I may first try getting that Comair fan.

[chaosdriven]

Originally posted by Silversinksam
chaosdriven,


First I'd like to say that looks very sweet, I'm curious to know if you tried that mod with a Fan on the Sk-6

If you did what were the results with it

For added cfm's and 'quietness' maybe you should check out the Comair Rotron Fan, I sent one of these to a OC.com staff member for testing and maybe he will have results soon for you people.

At 5-9 volts this Comair fan is whisper Quiet and I was actually surprised at the great performance of this fan.

I also tested the AC model, but that fan is extremely noisy.
Comair Rotron Fan. It is 6 3/4" x 5 7/8". It has 7 blades. Model JQ12B4, 12 VDC


These fan can be found on Ebay [Search Comair]
Also If you search OC.com there is mention of a few vendors selling them for $8-10 dollars.

http://www.thme.com/anewebay/fans&heatsinks/comair1.jpg

I'm thinking that the main limitation of the current setup is the static pressure that the main fan can generate. I noticed a real decrease in the amount of air flowing out of the case with the current arrangement vs when I had a Millenium Glaciator and the unducted side panel mounted Sunon.

Thanks for the Comair reference. I did see another post here about it being available at BGMicro, but they are already sold out.

The Comair website shows that these fans can create pretty hi static air pressures while maintaining 50-60cfm airflow:

http://www.comairrotron.com/dcfans/MajorDC.htm

I'm thinking that this might well be a good solution, though I will have to rebuild the voltage controller circuit to handle higher current. (http://casemods.pointofnoreturn.org/vregtut/)

Thanks again for the references.:cool:

I will update this thread as I make changes...

[chaosdriven]

A quick update:

I made two 2"*2" copper plates, nibbled out a space to allow for the SK6 clip, and drilled a small hole to fit a 3" bolt. Hand tightened the assembly to the SK6 so that the plates sit on the top and bottom of the HS, with the bolt running the center just over the clip.

With this in place, so far my temps have maxed at 45C, running at 1615(9.5*170), and it has been stable so far for about 6 hours running SETI.

The plates protrude into the duct about 3/8".

Here is a drawing of the plate: