4-stage cascade

kayl · 06-11-2009, 03:52 PM

By before

I'm back from NYC and I've started working on the box for the liquid recievers today. I remains to find a good solution for insulating the solenoid valves.

maybe just used sticky back tape.
What size TX valves did you use on each stage??

DavyBoy · 25-11-2009, 03:16 AM

Dude, this is crazy!!!

before · 14-12-2009, 03:39 AM

@Kayl, sorry dude for answering you back so long; well, I'm using a TIO-00 for the first stage and a TIO-01 for the remaining ones.

Tuning has started.

- 1st stage = HSP @ ~ 10bars & TEV @ -67C

- 2nd stage = HSP @ ~ 10.5bars & modded TEV (R1150) @ -111C

- 3rd stage = HSP @ ~ 7bars & CPEV (wide open) @ -112C

Just for fun. 1st stage is way too cold this way.

Anyway, I'm very surprised how well it actually holds the load of the running lower stages even with such a pressure.
With the CPEV opened like this, the 3rd stage pulls down amazingly fast!!

before · 15-12-2009, 03:15 AM

Looks to be the min possible for the 3rd stage CPU evaporator. A bit more of insulation will obviously help to reach -130C

First stage TXV = -57C to -60C (I'm gonna tune the superheat a bit more here)
Second stage TXV = -107C to -108C

eva2000 · 15-12-2009, 05:56 AM

wow -126C and there's a 4th stage to come!

before · 16-12-2009, 10:03 PM

hehe

I've played a bit with superheats to get these. (3 stages running)

1st TEV @ -55.2C

2nd TEV @ -101.5C

3rd stage CPEV @ -130.7C (crap pic sorry)

snappy1 · 17-12-2009, 07:26 AM

Who needs LN2 when you get that 4th stage to kick in, great stuff, amazing job

I am really looking forward to your results

Bold Eagle · 17-12-2009, 12:18 PM

By snappy1

Who needs LN2 when you get that 4th stage to kick in, great stuff, amazing job

I am really looking forward to your results

Very true, had to subscribe to this

.

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