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View Full Version : Determine lowest possible "Bong" temps


BubbaJoeLouis
10-23-01, 09:49 PM
Here is a quick and dirty way to determine the lowest possible water cooling temperature you can hope to achive in your environment with a bong-type water cooler. By your environment I mean the temperature, humidity, air density, etc. where your computer resides which all go into the evaparative water cooling tower equations.

Take a thermometer and apply a constant film of water to its bulb. You can achive this in any number of ways; try a cotton ball soaked with water, or any number of other creative ideas I am sure you can come up with. But most importantly, maintain a constant film of water on the bulb of the thermometer.

Blow a fan with the equivalent amount of air you would put through your water tower onto the thermometer. Any old brushless will do.

Wait for the lowest possible temperature reading on the thermometer, and that will be the best possible cooling you can expect from your water cooling "bong" tower. This will of course vary throughout the year.

What you have built is called a sling psychrometer, which designers for large water cooling towers use to determine site conditions for a new installation.

Good Luck,
BJL;)

Colin
10-23-01, 10:12 PM
Wet bulb temps are fine but I think you will find that about 7C below ambient is about the best a bong cooler will do.

BubbaJoeLouis
10-24-01, 09:03 AM
Wow, you really know how to burst a bubble.

I suppose next you'll tell me that my parents are the ones putting the presents under the tree...

Or even try to have me believe that little mouse really didn't wear a ping-pong ball helmet or ride a motorcycle...

Are you the kinda person who also likes to hand out answers to the lab questions in Physics class?

tsk tsk tsk...


BJL;)

Colin
10-24-01, 10:04 AM
Naw but theory sometimes gets warped a bit in practice. Note I just said sometimes. My comments come from personal experience and way too much time on another forum that's known for bong cooler threads and the home of it's inventor. 7C below ambient has been the practical limit so far.

JaY_III
10-24-01, 11:31 AM
My CPU when doing nothing ran 3 degrees C under ambiant temp