Small cascade

[cold_ice]

Some time ago I started building a small cascade with two NL11F compressors. In the first stage I use 200cm of 0.026 captube and a 4,5m long HX with 2x 3/16 in 1/2" tubing. In the second stage I use 230cm of 0.026 captube and a second HX to desuperheat the gas before it enters the main HX.
Dimensions of the cascade: 60x30x40cm













Finished






First run










20mm thick insulation is frozen after 1 hour of running










First stage holds about -60° HX in and out when 2nd stage is running. I don't know why but this cascade is working better than all my previous cascades, where I used valves. I will put her under load today, lets see what it can do

[jinu117]

-60 sounds tad low for capacity concerns. Looks really good though. What do you mean better? more stable or just better temperature?

[cold_ice]

Lower temperature and less problems with charging (amount of refrigerant..)

[GuGaCoSa]

Hey thats looking great, im making a 2x 1/3hp compressors cascade too,but ill use TXV on first stage and AEV on second stage,ill make a building thru topic.
What gases did you used?
Regards

[gloatlizard]

what a beauty...

how powerfull are those compressors?

thx

[cold_ice]

I used R404a in first and R1150 in second stage. The compressors have 1/3HP

[skirms_fr]

nice small cascade with capillary

[the_new_guy]

cool cascade, what is the 2nd hx for? are you using the suction on the second to cool the 1150 also?

[Raiden Zero]

nice work
...as always ^^

[Tonic]

Try to get -115.0 *C

I think this desuperheating HX helps a lot interstage HX and affects on boiling temperature.

Also I think you should next time add a subcooling HX. So, a discharged gas (~60*C) would pass through
desuperheater (~45*C), next through desuperheating HX (~-40*C), through interstage HX
(~-60*C) and finally through subcooling HX (~-80*C).

Those temperatures are speculated, I wanted to show how it should +- work

But with greatly subcooled liquid you can do wonders

[Grave]

Looks nice.

[cold_ice]

Didn't make a screen with exactly -115°C...
But today I put her under load. I'm very happy with it, it does -93,5°C with 180w heatload (maybe more because there's no insulation on the loadtester). The first stage holds about -45°C to -41°C (have to play with the charge a bit)
I had to add some refrigerant to both stages, in the second stage I end with a iunloaded temperature of -110°C. I think this is very good for such small compressors.
I hope I can test my new P4 670 with the cascade soon. LN2 is here too

[gclg2000]

looks great!

[hatemi]

No need for larger compressors. it is just amazing how good results you can see when using the SLHX before tha main HX...enven tough it is unlogical but still it works :=)

[mesyn191]

That is one badass lil' cascade man, -90C with 180W load is amazing!!

[cold_ice]

A rock stable first stage is the base for a good second stage. So maybe a bigger compressor (maybe SC15) in the first stage would lead to some better temps. But I think -44° on the HX with load is not bad at all.

[cold_ice]

Finished the insulation today.

[Icy]

may i be the first to say nice job on the insulation!

[Shinuza]

may i be the first to say nice job on the insulation!

Agreed

[[XC] moddolicous]

I dont know much about phase change (actually, barely anything) but everything looks very nicely laid out. To check what the temp for the 670 @ 7ghz will be, try using a 400w heat load.

[RussC]

Yup,
Very nice insulation. Great work,

RussC

[Aphex_Tom_9]

man, you make -115c look easy, hehe

[jinu117]

I dont know much about phase change (actually, barely anything) but everything looks very nicely laid out. To check what the temp for the 670 @ 7ghz will be, try using a 400w heat load.

What are you smoking? Doubt even 670 @ 7ghz will pull out even 200W (real wattage not some guestimates) You would have fried your CPU or mobo components well before 400W, believe me.

[eva2000]

oooh very nice any idea how much it weighs ?

[hatemi]

Getting over 200w with any single core is damn near imossible.