4 stage cascade

[berkut]

N2 would be horrible to use as you would need a very high gas flow through the N2 stage. Argon is on the edge requirering if i remember correctly 4x more flow than ethylene for example. Methane isnt harder than ethylene on paper. Dunno in real life.

[cold_ice]

We will see how methane works in some days.

[Unknown_road]

I once calculated that methane needs about twice the volumetric flow compared to that of ethylene to get the same suction pressures.

[BWR]

Any updates?

[cold_ice]

Not yet, because I have to work on a lot of custom units. These must be finished first.

[ncc-1709]

well hurry the hell up!

[Xeon th MG Pony]

lol, easier said then don, you can't just "hurry" it up, well you can but the unit will all ways be mostly crap when rushed past your natural working speed. This is why I refuse rush jobs, and pleased to see that most here do the same, it is the age old argument of quality over quantity.

[[486]]

if he rushes and messes up a braze and explodes= no more cold-ice = stricter refridgerant laws= everyone gets pissed when you have to be epa 608 certified to get a propane tank for your grill. oh, and, no more updates
so please dont hurry too much

[Lotec25]

Amazing, I have read threw this hole thread just amazing i had bugs flying in my mouth. OutStanding Job can not wait to see this finished.

[hipogtr]

Talk about an xtreme thread. Excellent content and really looking forward to the outcome. Good luck.

[Gebba]

any progress whit the project yet?
it most be mutch better then di anyway

[Moc]

He will continue his work at end of july. First, he has to finish few SS.

[Weee]

He will continue his work at end of july. First, he has to finish few SS.

Well, then I'll be checking back at the end of July! So close, yet so far away.

[Weee]

July ended, hope you get around to this soon!

[cold_ice]

I redid the third stage, using a CPEV instead of captube now. Maybe I will make a testrun tomorrow. I will take pics.

[nachthymnen]

I redid the third stage, using a CPEV instead of captube now. Maybe I will make a testrun tomorrow. I will take pics.

Uh, can't wait to see other pics

[Extera]

any updates?

I'm realy want to see the unit running at all 4 stage's

[$ilver]

any updates ?

[cold_ice]

I changed some parts in the last two stages. Instead of captube I use CPEVs now. And I also redid some pipe work in 4th stage.After I had problems with the R14 in the third stage the unit is running fine now.

1.stage: R507 -20 to -25°
2.stage: R23 -65°
3.stage: R1150 -95
4.stage: R14 -125 (w/o load)


In 4th stage the R14 is running without problems, in third stage the HX always warmed up after some time (I think oil freezed in captube after CPEV), with R1150 I have no problems. In 4th stage I use bigger captube after CPEV, here it works fine.
For a 4 stage cascade with R50 in last stage I think I need stronger compressors to hold about -80° in second stage. But I would be happy for load temps in the -120° area with the R14 in last stage. I will load test tomorrow, and I will finish the missing insulation too.









pressures last stage

[Blaster]

like said before, awesome amount of work

... but have you adjusted the superheat screw on 2nd stage TXV, i really feel it would help temps on 2nd stage. Try closing it half a revolution at each time so you know how many turns you have closed

[gert_bobo]

very nice work
true piece of art
nice craftmenship (if i spelled that right )
Greetz Gert AkA B0B0

[n00b 0f l337]

Hmmm suprisingly I was expecting a lot more.

[bazx]

great work ice what cpu will you try it on

[cold_ice]

The compressors are too small for condensing R14 in third stage and R50 in fourth stage, thats the feeling I have. I did a small load test today, with 200w it did -115°, I will try to get it down to -120° loaded.

[dinos22]

-115 loaded is great man