Mythical tech Posted May 31, 2019 Share Posted May 31, 2019 So I have been working on a cascade TEC cooling unit that can get the cold side to well bellow -100c at idle and when a heat load is applied it sits at around -70 at 230 watt load. My plan is to use an ac to cool a water loop as the first loop that will cool a cascade system that I build years ago that can achieve a delta of ~30c from the hot side. My ac unit brings the water down to about -20c which means that if it works as planned the first stage will get down to -50c or so. I plan to use 4 of them to cool pure ethanol to cool my final stage which should get down bellow -100c. My problem right now is any tubing I have tried starts to break at anything bellow -40c. Any suggestions on what I can use would be very helpful. Quote Link to comment Share on other sites More sharing options...
ZFeSS Posted May 31, 2019 Share Posted May 31, 2019 30 minutes ago, Mythical tech said: TEC cooling 230 watt load. That means ~700W of heat for second stage (-45c) and ~2000W of heat for first (-20c) stage. Your AC unit is too weak for this I think. Classic gas cascade unit will be cheaper and easier to build. Quote Link to comment Share on other sites More sharing options...
Mythical tech Posted May 31, 2019 Author Share Posted May 31, 2019 As for cost I already have the TECs except for a few 400 watt ones and I am using dual 40k btu ac units that I got for free. They get 15 gallons down to - 20 in about half an hour. I am going to using it to bin CPU's for super pi 1 million so it will only have load for about 30 seconds at a time. I am not good enough at welding to safely build a r1150 system that won't kill me. Quote Link to comment Share on other sites More sharing options...
ZFeSS Posted May 31, 2019 Share Posted May 31, 2019 It will be interesting project. You need to make a quiet huge 2kW heat exchanger anyway. And another one for the second stage large enough for 4-5 250W or what you've got TEC modules. As for tubes - copper ones usually are used. 34 minutes ago, Mythical tech said: build a r1150 system that won't kill me. You can use R13/R23/R502 or R508b. Although they still can kill you, if the pressure rises high enough Quote Link to comment Share on other sites More sharing options...
Mythical tech Posted June 1, 2019 Author Share Posted June 1, 2019 So after doing some math -70 idle seems more doable. The system will still draw over 3000 watts but I don't pay for electricity where I live so that won't be a problem. Quote Link to comment Share on other sites More sharing options...
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