Cooling Tower Mods

[Greedy Guido]

I have just performed some mods to my cooling tower. I add a whole lot of sprays and installed a mist eliminator at the top. There is no misting at all from the fan discharge.

I have a Duron 750 at 1000 and when running 3DMark2001 for halve an hour my CPU reaches 33°C and my system temp is 33°C.

Currently my system temp is 33°C and my CPU temp has dropped to 30°C.

It may be warm in sunny Brisbane, Australia, but my PC isn't.

I wish I had something to test wet bulb temp as I believe I am approaching this (lower limit for a cooling tower).

What do you think?:D

[Diggrr]

If you'd like, I found a link to a site explaining how to make a wet bulb thermometer for students....you should be able to follow eh?
http://www.studyworksonline.com/cda/content/worksheet/0,1036,EXP234_NAV2-4_SWK218,00.html

The only good calculator I could find online is here, Somewhat difficult to use, but you can mess with it some. Dry bulb is ambient temp, mark next to the input your making (like relative humidity).
http://www.thermalinc.com/math/wetbulbcalc.htm

Enjoy.

[FrozenInHI]

i wouldn't trust those temp readings just yet, cooling below ambient temperature is real hard to do in any type of environment. thermally speaking, i don't think it's going to be possible to do without actively cooling the water lower than what you have it at right now (chiller as an example), in which case, the cpu will still have a few degrees over that as it's temp in the best case scenario.

[Greedy Guido]

FrozenInHI,

It is very easy to drop below ambient with a cooling tower. However, you are limited to wet bulb temp which is saturation point.

The problem is with cooling towers is as you approach the wet bulb temp (known as the approach temp) the tower has to work harder to acheive lower temps. Usually this means increasing the tower size or internal surface area. In commerial cooling towers an approach temp of 4° is considered low.

Whoever told you that you cannot acheive less then ambient with a cooling tower (cooling water that is) does not know what they are talking about. Ask any engineer who works in the power generation industry.

[Diggrr]

Read this link to the front page tutorials. It's the test temp charts from the originator of the bong.
Mine went 8C below ambient, as my humidity was probably higher than his.
http://www.overclockers.com/articles389/index02.asp