Quote Originally Posted by LukeXE View Post
Yes, I see that now.


low side pressure of third stage, -0,9bar or less while HX temps is around -100. When, for example, I will open oil return valve on stage 2, then Hx temps is going up to about -70, discharge pressure on stage 3 is raising to around 11-12bar (still going up, but at 11-12 gas become condensed I think) and evap temps is going down very, very, very fast to -130. Then I`m closing 2 stage oil return valve, HX temp is going to -95-100C and evap temps is usually -13xC. If I won`t do that, HX will have -100C and at third stage discharge will be around 3-4bar...all the time, evap temp around ambient.

I was afraid about first stage when I was building that unit, that it won`t hold load etc. I think around -55*C with 3 stages ON is pretty good ! autocascading power
hmm that is strange. lets hope that doesnt happen when you get argon in there.
Quote Originally Posted by LukeXE View Post
No problem, remember to take a lot of photos for me from CeBIT.

R14 is borring, I would try methane (-161) in that cascade and probably I will do it
if i was to ever tackle a 3 stage methane would be my only choice, r50 is in your gas mains in your country hey luke?
even a blend of the two gases worth a try.