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So, few changes I`m gonna make:
1. Expansion Tank for second stage.
2. This trick with hot gas bypass thru evap.
3. Buying Methane (I really would try with it).
4. Still waiting for manometers for each stage (refco, highside)
5. Will R290 in third stage freeze ? I would add a little bit for oil movement.
6. Breaking fu*cking -150 !
5) Not if you autocascade it.
5)If I won`t autocascade it, it will freeze at -130 ?
Still thinking about that methane...Well, for sure I must rebuild a little bit that third stage, I`m out of R14.
Symphy, where are you ! :D
Propane melting point is at −188 °C, so im guessing you're pretty safe even with relative high pressures.
propane will just try to pull the oil out of the oil sep... seems useless to me on a system with oil sep
But with homemade oil sep some of the oil is going after oil separator, and I thinked about using propane to carry that oil thru evap. In that case oil shouldn`t freeze in evap, because there is refrigerant which will take it from there.
Luke have you read Runmcs thread properly at under the ice? Its got info on number 5, chilly also tried that with no luck.
If you can get r50 I would vac that system and try 1150/r50 blend first before doing anything. Specially if you get a bottle you will have heads to play with. The changes you mentioned above don’t deal with preventing the oil issues, only a fix when it gets plugged. 1. sound good for second stage but only if your static charge is too high. Once you get 3rd stage working well id say you might need one on second stage, but best to fix 3rd stage with less work. Be nice to see -150c. pitty pc-ice pulled his 3stage methane cascade when he was banned here. From memory he used 0.040” capillary line or bigger and lots of it to achieve his -160c noload cascade.
....and probably -100C @ 5W :p:Quote:
Originally Posted by kayl
I had oil problems on my cascade with the Henry 5180 Helical oil separator, it was cheap, but this not very effective. Once ive changed to the danfoss OUB1 all problems dissapeared, i now have -125 no load temp on it and it can run hours like that. High side pressure 14 bar with no load, 11bar static with around 4 lts of expansion tank.
Yes, methane is priority.
I need expansion tank for 2 stage because static charge is now about 16-17bars.
I`m still reading runmc`s thread :)
luke_xe@yahoo.pl ;)
What displacement...don`t know really, I must talk with Piotres about that.
and yes, on stage 3 there is plate HX.
I would try with methane, autocascading with R290 + subcooler.
thank you Tom for help :)
Do you mean another compressor Soddem? An auxillary cooler could remove the oil very well, be it propane or something even easier to condense. Just need to put on another small condenser for it.
I thinked a lot about that cascade for few days, thanks NoL and Tom for conversations :toast:
So, I will change I stage compressor with II stage compressor, so compressor with the highest capacity will be placed on stage II (we wanna super low HX temperature).
Third stage will be autocascading Methane with R290, I will try to get good condenser for it. I will play with captubes too and tune I stage for super high load, it should hold at least -35*C@full load (II and III stage with III stage loaded), it will be enough for ethylene to condense properly.
We will spend some more money, but I think that that unit is worth it. If everything will go ok, it will be one of the strongest cascades in the world, won`t be ? :woot:
Still waiting for Symphy :)
Very possible Luke, at least in the computer world. ***Chatting :)
As we chated on msn, only first stage is autocascading.
Propane/Methane stage for cooling methane before main HX + oil carying by propane, super effective oil separator :p
Yes, you can try that on 2nd stage too. Have the 3rd stage r290 chill a HX before the phase sep. No way to condense methane so dont worry. But dont do that with 2nd stage or ur oil removal loop might get some liquid r1150 or the likes in it. Doubt it, but possible.
Yeah overall thats going to be very hard to do even with ethylene. I think your going to need r14 to condense methane properly.
Also, getting the methane to at least -60C or so would be advised before it hits the HX otherwise your adding even more load.
I agree with Tom, otherwise youve got a high pressure explosive in your hands.
I'm thinking in this units case, He doesnt have +30cc to work with.
26cc won`t be enough, right ? I only have this one, the biggest I`ve.
heh! i have finished reading :D ,, nice work again luke , i believe u ll break -150..;) ,, i like this cooling part on xs , everybody shares and helps each other...:clap:
cool project luke, i'v been away and did not finished my cascade yet, now full loaded with x6800@ 1.9xv and propane/ethylene/ethylene i'm on -60 -110 -115
soon i'll try natural gas from my house (95%methane) on 3rd and maybe we can get some more examples of 3rd metane stage
i'm tunned on this thred
:Toast:
LOL unlike the watercooling section.Quote:
Originally Posted by hey
Any progress Luke? Its been a while... I know you were out of money for better gasses, but still... any news?
I'm sure its in the works. He's basically going to rebuild it with autocascading firsts in all stages as oil separators.
So each stage is going to be a 2 stage autocascade, using the lower temp gas in each stage as the oil carrier? Damn this place is extreme.