CO2 cascade

[jan]

this is my co2 cascade. i've built it 4 weeks ago. today i charged it. just tested for short time so ive to tune the charge.











This is the lowest temp yet...



HX temp with 2nd stage running. First stage uses pure R290.



Currently I've a big problem with dryice forming :cry: I need to find the right charge.



A bit ice







And again the whole system.

[shadowing]

Nice! That's a huge condenser you have though.

[FUGGER]

Very nice, bummer about the dry ice forming. Are you running a second gas in the second stage to try to prevent it from turning solid? Maybe 134A or ?

[jan]

Very nice, bummer about the dry ice forming. Are you running a second gas in the second stage to try to prevent it from turning solid? Maybe 134A or ?

Its a mix of CO2 and R290 I am using right now.

I need to find the right charge. But maybe I'll try with R134a too.

[cold_ice]

Looks good, the fan is a bit dangerous
Are the temperatures HX-out or HX-in?

[jan]

Looks good, the fan is a bit dangerous
Are the temperatures HX-out or HX-in?

hx inlet. next time i'll take the outlet temperature


oh, the fan is more then dangerous. but i'll use another fan in the final cascade. this is just for testing.

[kayl]

very nice jan, and some nice temps also
you can lisen to the eva. add lots of r290.
then slowly replace r290 for more co2.

[bxa121]

birkut did a co2 cascade a while ago.. give him a pm, he had a trick on how to stop gas forming in evap...

[Russell_hq]

he had a trick on how to stop gas forming in evap...

Surely you mean dry ice/solid CO2 man

[berkut]

sofar i noticed R22 works the best with CO2. R134A does not help at all.

[jan]

sofar i noticed R22 works the best with CO2. R134A does not help at all.

Hm, maybe I should order a bit R22. Does it work much better then R290?

Best would be R1150 insted of CO2 but I don't have the money right now.

[berkut]

with co2 nothing works much better, its only a little better

[jan]

with co2 nothing works much better, its only a little better

then I'll save the money for r1150


you and kayl used only a small amount of co2 and more r290 in the second stage. is that correct?

[berkut]

exacly like me

INSULATE

[kayl]

then I'll save the money for r1150

you and kayl used only a small amount of co2 and more r290 in the second stage. is that correct?

that’s righ lots of r290/ not sure if there is more r290 or more c02.
Easiest way is to load it on cpu, and if it starts to suck vacuum (blocking)
Or get a complete block and low pressure increases and temps fall,
Need to add more r290. but at the same time ya need enough c02 to get cold temps.
It’s a big challenge.
But then once I sorted it when you remove the evap ya get nice noload temps.

I know im saving for 1150 too jan.

[bxa121]

Surely you mean dry ice/solid CO2 man

d'oh!

[GuGaCoSa]

Hey Jan,very nice cascade,but i just have one question
What regulator do you use for your co2 bottle?i'm getting a bottle like yours(my bottle suports 0.6kg of co2)and i would like to know what regulator do you use.
Thank you.

[jan]

Hey Jan,very nice cascade,but i just have one question
What regulator do you use for your co2 bottle?i'm getting a bottle like yours(my bottle suports 0.6kg of co2)and i would like to know what regulator do you use.
Thank you.

I use a CO2/Argon regulator