Small cascade

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

http://www.extremecooling.net/random..._kaskade/2.jpg

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Finished
http://www.extremecooling.net/random...kaskade/15.jpg

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First run
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20mm thick insulation is frozen after 1 hour of running :D
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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 :D

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

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

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

what a beauty...

how powerfull are those compressors?

thx

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

nice small cascade with capillary :D

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

nice work :D
...as always ^^

Try to get -115.0 *C :D

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 :D

Looks nice.

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 :D

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looks great!

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 :=)

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

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.

Finished the insulation today.

http://www.extremecooling.net/random...kaskade/34.jpg

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

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Originally Posted by Icy

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

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Agreed

:clap:

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.

Yup,
Very nice insulation. Great work,

RussC

man, you make -115c look easy, hehe

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Originally Posted by 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.

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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.

oooh very nice any idea how much it weighs ? :)

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

Quote:

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Originally Posted by eva2000

oooh very nice any idea how much it weighs ? :)

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Should weight about 35kg, but I don't know exactly.
I put the cascade on my P4 660 today, and the evap stayed below -93° at load all the time (1,75 and 5,8ghz).

good job coldice , it s a very good cascade there :)

Thx :)
Time to put the cascade on the P4 670...