Good job! :clap:
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Good job! :clap:
Thx.
Loaded it does -97° with 180w heatload (load tester is not insulated so maybe more). I'm trying to get -100° loaded but thats not easy. Ethylene is not a gas with properties as common refrigerants.
I get the feeling we have reached the limit of how deep hermatic compressor can pull on vacuum to be honest. Rotaries in the other hand seems to do well on vacuum department... Of course not everyone likes the noise :PQuote:
Originally Posted by cold_ice
Yes you might be right. But for -100° loaded you don't have to be in vacuum.
But maybe I will try a cascade with two rotaries, when I have some extra money and time.
Do you want to use R410A rotaties?Quote:
Originally Posted by cold_ice
damn you've got awesome stuff there, such fancy items - that whole system cost more than i have in the bank from work this year, a lot more :(
nice cascade tho :up:
do you use any high temp gasses in the ethylene stage ?
did you try squirting just a ****little**** methane ? And i mean a little.
Are there any flow limiters on the discharge line - oil sep - HX ? How thick is the discharge line ?
Just pure ethylene. No didn't tried some methane, but maybe a little squirt of R14 would be better? But methane would be cheaper than the R14 :D
Discharge is 6mm on first and second stage.
Cap tube is 0.031 about 2.3 meters.
I think the chance of having a positive effect is bigger when adding r14 then with r50.
cold_ice, have you tried R410 as first stage refrig? Couldn't you gain a couple of evap degrees that way?
Rotaries just love 10-15Hhg;)Quote:
Originally Posted by jinu117
Nice cascade there cold_ice
No didn't test R410A, because the valves are designed for R507. But maybe you could gain a few degrees in a unit with captube in first stage. But you have to handle the higher condensing pressure.