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Starting my Water Chiller setup - Page 2

post #11 of 28
Hey Roxter,

I forgot to tell you in my first reply about a way to lengthen the life of the evaporator coil. It`s a little work, but it will really help. Before you even begin to use the unit, strip off all of the aluminum fins from the evaporator coil. The easiest way is to get a large pair of straight tin snips (the ones with the flat sides and replacable blades) and cut in between the copper coils all the way across the fin face. When you cut enough fins in one direction you can then snip 90 degrees the other direction, and this will make it fairly easy to yank the fins off with a pair of needle nosed pliers. Be careful not to yank too hard and poke a hole in the copper evaportor tube and cause a freon leak. Once you get all the fins removed, clean the copper tube with a degreaser or paint thinner. DO NOT USE SANDCLOTH OR STEEL WOOL on the tubes, or it will caused electrolosis and the next step won`t work. Use just enough spray enamel paint of any color you choose (except the same color as the copper tube) to cover the evaporator tube portion which will be immersed in water. One coat of paint that covers the tube completely (so you can`t see the copper tube through the paint) will be all you need. This should last a long time, provided you don`t bend up the evaporator tube to the point the paint will flake off later. At some point in time you will need to add some paint, but use only paint stripper if you feel the need to remove it. You will still get very good heat exchange through the enamel paint, but don`t be tempted to use epoxy; it has poor heat transfer capabilities.
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post #12 of 28
If you want maximum cooling loose your current evaporator and get a drop coil design like this:



A drop evaporator coil like this can then be placed in your res to get very efficient cooling.
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post #13 of 28
Hey Roxter,

What metalman 2785 holds in his hand would be the ideal coil for your setup as far as function and room in a water container/cooler. However, you would have to do some refrigeration work to accomplish this. It all depends upon what you want to do for your setup. Right now, you don`t seem to have any operating problems with the system in its present state, and "if it aint broke, don`t fix it". The other side of that is this old window shaker may need a new coil anyway in the not too distant future. You may want to opt for the new drop evap. coil now and start out with the best and most reliable setup.
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post #14 of 28
Looks like a real mad scientest at work! Thanks for posting your extreme chill set up!

That is some superior info by others added there in the posts above! My only recomendations would be to use a 6-pack cooler (insulated container) rather than a thinwalled container as depicted in your first posts. And to consider using a mixture of denatured alcohol mixed with PEG for the cpu loop--provided your tubing, barbs , pump, etc. can handle both the extreme cold and the alcohol. The viscosity of this mix is thinner than conventional water/antifreeze and will probably pump better.
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post #15 of 28
Thread Starter 
wow, this thread is going crazy with information. Thanks so much for all that. i will not be replacing my coils as i would need to take it to someone to get it refilled with refridgerant and at the moment i am trying to spend the least amount of money possible as i am saving up for a new computer this summer. But i will strip off the aluminum fins on the evap. i will also be putting some neoprene insulation around the pipes that go to and from the evaporator to stop the from and condensation. one thing that i've been meaning to ask for a while is should i spray down my waterblock and mobo with a dielectric spray and then put dielectric grease on both the cpu pins and the spot around the socket?

BTW, i should be getting my copped to start making my waterblock fairly soon so i'll post some pics of that. Also i will be starting to make my wooden box/case for the chiller and i'll post pictures of that too. hopefully it doesn't take me too long and i dont have to spend much money.

Now for the temps. Even in my little garbage can that i'm now holding the water in it gets very cold and seems to keep its heat for quite a long time. Today i turned it on for about 20 minutes, but got scared once the frost got dagerously close to the compressor. when i turned it off the water/antifreeze was at -9C and my 3/4 antifreeze 1/4 water concoction was freezing to the evap! This might not seem strange until you look at the antifreeze jug ans its rated for -50C. now it wasn't totally frozen, just a soft slush, but 2 hours later i stuck my thermometer in the water, and theres still -2C slush stuck to the evap. i'm thinking that this will be quite the waterchiller, but i might have to go with the idea of pumping alcohol through as it has a freezing point of about -90C +/- 5C

anyway you guys should keep on posting as it is what is keeping me going. Also thanks alot for reading this looong comment(if you took the time to do so)!
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post #16 of 28
Awesome--good thing that neoprene--cold metal like that can flash freeze to your bare skin--be careful. Like wise please be careful if you decide to go witht he alcohol concoction--not only poisonous, but flammable...good luck--you freak!
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post #17 of 28
Thread Starter 
ahh i'm not so sure if i want to go with the alcohol if its poisonous and flammable. That was why i got plumbing antifreeze instead of the regular stuff, not only can it withstand loser temps, but it also is not toxic. Also, i've noticed that the metal can for sure flash freeze to your skin because i touch the pipe when it was extremely cold and could feel the tug on my skin when i pulled my hand off.
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post #18 of 28
Some suggestions,

Don't use a styrofoam container, unless you waterproof it. Use a plastic cooler instead, it won't corrode and is more sturdy.

Use isoprobyl (rubbing alcohol) and water. Believe it or not antifreeze will start to get gooey at extremely low temps and can ruin your pump. Rubbing alcohol never freezes and is cheap.

Make sure your pump is outside your res/evap/rad settup. You ideally want your pump outside the insulated area because it will produce heat as it is running and this will bring the temps up.
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post #19 of 28
Thread Starter 
yeah, i'll use all those ideas, thanks alot!
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post #20 of 28
Thread Starter 
hmm, i have a question for you hvacgaspiping! If i covered the pipes leading to and from the evap with neoprene, would that stop the problem with the frost getting into hte compressor so that it wouldn't ruin it. this question is mostly for hvac, but anyone else willing to post anything that i could use would be great. doesn't even have to something that is of any value to me. just post your comments about how you think this project will turn out. If you have anything that could help me in the process of making this it would be great though thanks everyone!
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