Tripple digit cascade

[SoulEdge]

That's freakin awesome! Congrats Fugger and I want to see some pics!

[charlie]

You guys have me pumped up to spend the $$$ to get my -140C Polycold recharged!!!

C

[macci]

fugger, your heat exchanger is in the bottom of your units box. Notice the thickness of yer interior wall on the bottom of the box?
Its this big funky coil of tube in tube.

Same thing here with my freezer thingy.

See there the bugger is


Here's how it looks like at the moment (waiting for some parts)


(click pics for better view)

[Charles Wirth]

Cool, good to know what direction to go if/when I pull mine apart

[berkut]

It looks it uses CO2 in the II stage

[captaincascade]

lamao, wtf is that . it looks like a revco heatexchanger with a solow bottom. i bet that was a royal pain in the butt! I've never torn one down that far, ive only seem them like that at the factory. Good job you maniac.

berkut, thats a standard cascade heat exchanger. ill post pics of a different design used by forma, later.


that is basicly what my heatexchanger looks like


anyone wanna put up some pics?

[macci]

Jason, its using Necchi compressors and heres what it says on the box.

berkut, there is (was) some CO2 backup funtion on this freezer but it says its using some 'COLMIX' refrigerant on 2nd stage (and R502 in 1st). I guess its some mixture by Colora (this freezer is made by colora). It went down to around -91C with that refrigerant (air temp measured inside the freezer).

The idea is to build a dual evap system (CPU, GPU) and obviously get rid of cap tube config.

[captaincascade]

never seen one of those before. that propriatary refrigerantis probly just 290 and 503, you can use 290 and 95 without any cap tube mod.


what are you sayin about doin away with a cap tube?

[macci]

I was thinking about the TXV config but at the moment it seems that cap tube is all I can do (with single evap obviously).
Going to use Suva95 (R508B) on cascade 2nd stage as it appers to be about the only available stuff around here for good temps. Any better ideas for cascade 2nd stage refrigerant?

I've got the dryiers, connectors, coppertubin, tools etc pretty much figured out and will probably use flexible Dunlop HiFlex tubin to connect evap on this thing.

Hopefully this thing will do some major cooling in the upcoming days

[DaBit]

Originally posted by macci
Any better ideas for cascade 2nd stage refrigerant?

If you have access to it, I would say that ethylene (R1150) would give you some very decent temperatures. If the rest of the system is up to it, of course.

[herefishy]

Errrrrrrr, I'm currently working on a cascade, and it looks like I may be left with a spare 14# of R-13. That is if a particular source is willing to let go of the 23# drum for a resonably cheap price. That is a price that makes the proposed R-23 and mineral oil to POE oil change out less cost effective.

[macci]

Thanks for the tip DaBit. Looks like an interesting option indeed.

So far I've only been able to get some R23 and I'll do the first test run with it on the low stage and R404 on high stage.

I tested the 1st stage yesterday and it seemed to work rather nicely

Some new pics here

[captaincascade]

you'll only get -80c with r-23... -85c if your lucky. Manufacturers used to have 2 freezers you could buy, a -70 - -80c cheaper, or a -75 - -85 more expensive,. The price difference wasn't much i dont think, but some people didnt need -85c so they saved a little money.... Of course the cheaper one has r-23, and the more expensive has r-95...

Manufacturers stoped doing this about 3-5 years ago because the price differences got closer and closer, also because r-95 is a far superior refrigerant. We still have a big bottle we never use, we always just retrofit to 95.

[macci]

Just did the first test run with totally uninsulated system and measured evap temp of -84C
Heatexchanger hot side was at -9C no idea about to cold part of that (most likely around -35C)
I only ran it for a few mins and checked that stuff is working.

The evap has a leak on it so i need to fix that. With insulation and tweakin with the system I hope to reach even better temps.

but so far so good

[captaincascade]

good job man. what is that, three of these things we got goin now?

get some 1150 and yoll get even better temps

[berkut]

Well guys i wont win with you in terms of pure raw power (R23, a/c compressors..) but here's my secret weapon :



Hope that with that baby (youre not supposed to look @ anything else exept the injector ) ill be able to play with you guys... and the sysemn worked today with R22 in the I and II stage ;]

[Pimpsho]

ahh ya some progresss!!! nice work man how long did u let her run for? temps?

[macci]

nice one there berkut
r22 on 1st and 2nd? what kind of temps did you get with that config?
looks like an evap that might be rather difficult to mount and insulate.

btw, piccy from the first cascade run

[berkut]

Originally posted by macci
nice one there berkut
r22 on 1st and 2nd? what kind of temps did you get with that config?
looks like an evap that might be rather difficult to mount and insulate.

Thanks

I dont know the temps, i dont have any good enough termometers i know that the sst was @ ~-65C

I dont think that insulating it will be difficult, and the evap you see on the pic is a test evap

[captaincascade]

woops misunderstanding? i think.. sometimes i just go off on rants

[berkut]

nice one

Thx

Im trying to do as much as i can from the parts i have

Its a good thing that R23 is very cheap in Poland (as well as R22)

Tomorrow ill try to build the rest of my system so everything will be ready for the new flex hoses and dual evaps...

Forgot to ask 1 more thing:

What should be the ratio between the high and low side of a II stage ? is about 40:1 ok ?

[macci]

btw, I'm doing this project only cos I happend to find the freezer for free.
dont have the cash to do one from scratch.
also I'm not useing Suva95 cos that stuff costs 240€ per kg and the minium order is 4.5kg (=1080€!!)

[captaincascade]

woops misunderstanding?

[Charles Wirth]

CC, Macci is the man.

He could have an avatar of a cruton with some frost on it and chances are it will still beat our ass in the end.

[JCviggen]

yea... there's no beating that Finn he's the king period.