IxTk Silver Cascade

[before]

I hope to start building it in about a week.

1st stage

• Compressor: LG NJ 236P R-407C (14,200Btu/h; 23.6cc/rev)
• Condenser: Luve STVF 273 (2.73kW)
• HSP Service Valve: Schrader
• HSP Manometer: Wigam ML60/18C4FA/A8
• Filterdrier: Copper 30gr
• Expansion Metric: Dual 0.8mm captube (1.6 to 1.7m)
• Heat Exchanger: Compact brazed plate HX (12pl)
• LSP Service Valve: Schrader
• LSP Manometer: Wigam ML60/38C4FA/A8
• Refrigerant: R507

2nd stage

• Compressor: LG NJ 236P R-407C (14,200Btu/h; 23.6cc/rev)
• Oil Separator: Alco OSH-404
• HSP Service Valve: Schrader
• HSP Manometer: Wigam ML60/18C4FA/A8
• Filterdrier: Copper 30gr
• Expansion Metric: 0.9mm captube (3.4 to 3.5m)
• LSP Service Valve: Schrader
• LSP Manometer: Wigam ML60/38C4FA/A8
• Refrigerant: R1150

Miscalenous

• Case: Cold_ice's silver rotary case
• Evap line: Cold_ice's 12mm braided line with black sleeving

[Clemmaster]

You've got 2 other cascade to care of, crazy boy hehe

Can't wait to see it finished

What's the final temperature you'd like to get with such a cascade dude?

[n00b 0f l337]

Bet about -95C to -100C with 250W? Big compressors again

[Trouffman]

Nice before ! you seems to never stop pushing more your cascade cooling !

Hope this one will work as good as the other one !

[Oliver]

Sounds sweet and so pwr full...

Looking forward to see the work begin ...

[before]

You've got 2 other cascade to care of, crazy boy hehe

Can't wait to see it finished

What's the final temperature you'd like to get with such a cascade dude?

Thanks dude! This one is for the shop, not for me; of course I'll test it deeply first Aiming for at least -100C loaded.

Bet about -95C to -100C with 250W? Big compressors again

-100C to -105C would be better. I'll try to do my best.

Nice before ! you seems to never stop pushing more your cascade cooling !

Hope this one will work as good as the other one !

Thanks Obviously, this one won't be as powerful, but it could be a nice unit.

Sounds sweet and so pwr full...

Looking forward to see the work begin ...

Thanks

[n00b 0f l337]

Pure r1150 charge?

[Moc]

For what kind of shop?!

[sacha35]

Some nice parts in there before, looking forward to seeing the build.

[before]

Pure r1150 charge?

Right

For what kind of shop?!

pc-shop

Some nice parts in there before, looking forward to seeing the build.

Thanks buddy.

[n00b 0f l337]

Nice! Can't wait! Now bring on the pics!

[before]

Palet @home...



PS: on top, you can see the new condenser for my 2-stager

[DagoDuck]

Here goes!

Why are you using two equal compressors? In the first stage belongs a stronger one.

Capillary tube in the first stage? Why not a TXV?

Desuperheater in the second stage?

[before]

Here goes!

Why are you using two equal compressors? In the first stage belongs a stronger one.

Capillary tube in the first stage? Why not a TXV?

Desuperheater in the second stage?

In commercial refrigeration, it's common to use a similar compressor on both stages. Here's the reply I got from a service tech who regularily works on cascades.

I know that most of the mass produces -80C freezers have the same compressors on both stages. When you think about it make sense as your trying to transfer the same amount of heat through each stage, providing things are balanced. This way you get better COP from your compressors and use less power to run it.

Captube is for saving money lol and Unseen's method for dual captube looks quite interesting to try.

And concerning desuperheater, well, it saves money not to use one, and then oil-separator might be sufficient IMHO. Will see.

[Jack]

The first stage has to handle a bigger heatload, since the second stage compressor dumps heat into the refrigerant aswell (compressor efficiency issue: power is turned into heat (and motion ofcourse) ).

But 2 compressors of the same size will probably work just fine. In the early days it was common practice to use 2 of the same compressors IIRC.
Perhaps the differences in refrigerants in the first and second stage will compensate for the added heatload in the first stage.

[DagoDuck]

I heard different. Of course it will work just fine. But you are leaving capacity unexploited despite the fact that the difference between prices is non-existent or very low. Saving money? In the wrong place. It won't cost the earth. I think you should spare no expense as it is a cascade. But it's your funeral. No offense meant, m8. You have performed really great work there!

[Clemmaster]

You can run with a weaker compressor in first stage as well, there's no problem unless you want it to go out of its specs.

[before]

First stage done.

[piotres]

Good work so far .

This unit looks cleaner than Your all previous .

[before]

Thanks mate.

I've done 2nd stage yesterday; and fix 2 small leaks today.

[n00b 0f l337]

No desuperheater? Or am I blind again?

[before]

No desuperheater. Oil-sep should be enough.

[before]

First frost. With almost no insulation.



-52.2C HX out / -109.6C evap

[kayl]

Cascade is looking great my friend

[n00b 0f l337]

How far in vac are you there? How long was the pulldown for that?