Hi,
I've done some work today, with the room top, brazing liquid accumulator, filter, service valve and sight glass for first stage
Hi,
I've done some work today, with the room top, brazing liquid accumulator, filter, service valve and sight glass for first stage
Why did you replace AB with POE? POE is horrible and breaks down into waxy like beads at warmer temps than AB does.
Or is that for r507 and the first stage?
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No it's for the last stage, with R14.
I dit it because I have not access to AB oil. I wanted to use the same oil for the compressor, which is already POE.
Gotcha, so long as your not running for 6 hours straight or more it wont really matter (so long as you have a quality oil sep). The problems I run into is with "trying" to operate in a 24x7 mode and unfortunately its a problem with any oil and a cap tube system. Eventually some oil slips by the oil sep and then it gets waxy which clogs the cap tube. Anyway your build looks great!
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Okay thanks for the feedback.
I plan to use a solenoid valve as a hot gas bypass, to avoid excess oil in the evaporator by pushing some hot R14 just after the oil sep, directly to the evap. I hope it would be fine.
The leak issue is really for me the most important thing to check, as long as I use AKV expansion device.
R14 is $$$
No kidding r14 is very expensive and not easy to source either.
Bypass sounds like a good idea.
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Hello !
All stages are done, with 10 bar of helium to check leaks. It remains some electrical stuff to do, but I hope to fire that beast up by the end of the year, it would be a nice gift for Christmas
Have a nice holiday season !
Some pics :
Why did you use helium, unless you have a helium leak detector??? I understand the elements small size and its not found commonly low in the earths atmosphere. Making it a great leak detector gas.
The Laws of Thermodynamics say:
Zeroth Law: "You must play the game."
First Law: "You can't win."
Second Law: "You can't break even."
Third Law: "You can't quit the game."
Do you wanna Play Thermodynamics ????????I forgot "you must"
Yes, small atoms you're right. Hydrogen aside, there will be no leak if helium test showed no leak. My only fear is at low temperature, especially on the AKV, even if it has aluminum gasket. A french engineer told me that he has tested AKV's under -150C, so we'll see
Edit : I'm searching a good helium leak detector, moderately priced, if you have any idea
Hello !
First tests with 190 gr of R14. Pressures are a little high, I have to tune the TXV and R14's EEV, but got a nice -138C. Condensing at -73C, I have to lower that value :/
Lowered the whole room to -60C in three minutes
Wow very cool. Hopefully the fan can survive that!
If you have a cooling question or concern feel free to contact me.
incredible!
Originally Posted by L0ud
I think it'll be okay, it costs a few € so worst case ...
But I have some difficulties to go down ~ -85C, so I put a watercooling hose, connected to a CO2 tank, and I'm trying to purge out of the room the air ( and moisture that comes with ) by replacing it with CO2.
Co2 is not a good choice here because it will, just like water, freeze on your evaporator (dry ice) if you go below -78?C. Nitrogen is what you should use...
Hey MoC.
You're right, except that it only remains a very little quantity of CO2 once air and moisture are pushed out of the room. It is not a continuous injection during cooling cycle !
I've nitrogen and argon @ home, but it's much more expensive
Hi !
I'v managed to remove some extra R14 from the circuit. I think I've found the problem : I probably reached the MODP of the EEV, by removing some R14 I was able to lower the condensing pressure, and thus, opening back the EEV. The cooling chamber after 20 minutes of continuous running : ( up : EEV temp. down : chamber temp ) :
Woah! Looks very impressive jajaja.
Excellent work. The -90 temp is the HX?
That's probably his "Set" temp on the PID
If you have a cooling question or concern feel free to contact me.
Exactly.
I have to work around the cooling speed in the room, It's still too slow for me. I discovered that amount of gases is critical for a cascade, not enough = It won't condense, too much, pressures will be too high, and the good amount is tacky to find.
But it's part of the game, no ?
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