Symphy`s 3 stager

[n00b 0f l337]

Hahaha yes each will have an auxillary oil separating stage that will also remove some heat from that stages refrigerant before it hits the main cascading hx's.

[LukeXE]

Yes, I`m still working on that unit, but have already few more orders, which I`m doing too.

Ordered methane, I should have it around monday. (1,67kg, pure methane), all stages will be autocascading, hope we will see nice results.

[Polizei]

Cant wait to see results with pure methane... c'mon Luke... Ricky is putting up some competition!

[LukeXE]

Cant wait to see results with pure methane... c'mon Luke... Ricky is putting up some competition!

hehe, I`ve got much more job to do, I`ve got much worse compressors (almost twice)

[Moc]

Hahaha yes each will have an auxillary oil separating stage that will also remove some heat from that stages refrigerant before it hits the main cascading hx's.

Omfg... that means so much work!!

[n00b 0f l337]

Well of course, he's doing a three stager after all. This isn't meant to be a quick job, an easy job, or a simple job.

[Polizei]

hehe, I`ve got much more job to do, I`ve got much worse compressors (almost twice)

Who doesnt love a challenge?

Im sure whatever you pull off will be great, dont worry.

[Pete]

Right behind you Luke. Hope it is all god fun and not too much hard work

[Moc]

Well of course, he's doing a three stager after all. This isn't meant to be a quick job, an easy job, or a simple job.

Of course you're right but building a 3 stager or building a 3 stager with every stage autocascading is quite a lot more work to do.. 2x phaseseps and 2x hx more (first stage starts as a autocascade from the beginning so I don't count it...) !

[Blaster]

seems to me like a lot of work, and your complicating what is not so complicated

if you have oil problems just use a good oil sep and you will have your problem solved without any headaches, i suggest the Danfoss OUB1 the version for brazing

autocascading the last stage will take the main advantage of using "normal" stages, that is, being able to hold load at close to 0 psi

also be carefull not to "over do" your high stages, a stage were the HX temp is too low for the refrigerant that is condensing will have very low pressures and that will make it not hold any load
each stage should be design with an objective and with knowned boundaries, refering to the refrigerants that will be used

[LukeXE]

seems to me like a lot of work, and your complicating what is not so complicated

if you have oil problems just use a good oil sep and you will have your problem solved without any headaches, i suggest the Danfoss OUB1 the version for brazing

autocascading the last stage will take the main advantage of using "normal" stages, that is, being able to hold load at close to 0 psi

also be carefull not to "over do" your high stages, a stage were the HX temp is too low for the refrigerant that is condensing will have very low pressures and that will make it not hold any load
each stage should be design with an objective and with knowned boundaries, refering to the refrigerants that will be used

don`t have anymore oil problems.

First I want only do third stage autocascading, mainly for oil separation and too cool methane before entering HX.

With methane under load suction pressure will be a lot bigger than 0psi I think.

[LukeXE]

I`ve got methane




1,68kg

[Brettbeck]

That's a big bottle to say there is only 1.68Kg in... is that full capacity of the tank? On the other hand, I read somewhere methane is quite a light gas, so that would explain .

[LukeXE]

That's a big bottle to say there is only 1.68Kg in... is that full capacity of the tank? On the other hand, I read somewhere methane is quite a light gas, so that would explain .

Inside is 2,5m^3 of methane, bottle has 10l capacity. Don`t know exacly if there is full bottle, maybe.

[ryba]

In this bottle metan have 200bara pressure :O

[LukeXE]

Yes, there is 200bar pressure. huuugee

[Xeon th MG Pony]

I've been thinking of building a Auto-cascade tuned for a 1Watt load for a freeze drying system, I'll be watching this closely

[Brettbeck]

IIRC Ethylene here in the UK is 300bar !

[cold_ice]

IIRC Ethylene here in the UK is 300bar !

Normally around 70bar.

[Brettbeck]

Normally around 70bar.

In the UK ? Or where you are?

[Moc]

Austria...
At 20°C Ethylen has around 70bar... so why should there more pressure??

[aasmaukr]

Critical temperature : 9.5°C
Critical pressure : 50.76 bar

So, at 20°C ethylene can't be liquid any more, because of that the pressure will be much higher.
I didn't know it was as high as 300 bar (4350 psi) though, but you're proably right I didn't check.

[LukeXE]

UFFF !!! Almost all day I have spent at Xtreme Cascade and that Symphy`s unit...

I finished autocascading, 3rd stage Now leak testing, will vacuum it over night and charge tomorrow with R1150 + R290 for test.

BTW, I brazed captube to suction line with silver

[LukeXE]

After first fight.

II stage isn`t cold enough for methane, -100C only with third stage working. I will try to cut some captube from that stage and recharge it. On II stage is still 8000btu compressor.

Next, third stage autocascading R290/Methane.

1 bar suction pressure / 16 bar discharge --> -137C on evap.

I will fight with it, but propane is doing wonderfull job After 3h run no oil freezing

[n00b 0f l337]

Sorry to hear that Luke, just maintain contact with your buyers.