Xtreme 2006 Autocascade Competition

thanks n00b for ice bath shot, I updated first post ;)

Well if its reading high I geuss I'm at a disadvantage. :P

I have another thermometer I'm going to be using for this competition, so here is the ice bath shot for that one too:

http://www.baughman-eshbach.com/autocascade/50.jpg

Well it's not like I actually HAD time, but I took it :p: I was starting to feel a little down about not even touching the 'good stuff' for so long, and this felt very good indeed :)

I have to change my spec a little cos I gave away my 3/4HP compressor to a friend, and I just don't have time to deal with TEV, so...

1/2HP Hitachi Rotary R22 compressor.
7.5' .028" Low, 6' .028" high captube.
3.5m coiled HX 1/2" over 3/16".
Danfoss HP cutoff. (currently set to 375psi/6bar reset)

Evap made by a good friend on his lathe, reverse flow 4 step with groove for mount, and I may be able to borrow a chilly mount for it if it's ok, otherwise will do a 'custom' mount for it. Up to you guys ;) I had to get creative with the ring as it was cut a little deep and wide, but a rubber ring holding the c-clip in place seems to be doing the job.

Gasses (for better or for worse) will now be 402a/R23 as I ran out of R22, and don't want to deal with 290 again. Sticks to the R23 a little too well for my liking. I may get my R22 soon enough but will update that again if I do.

So...pics...

http://www.picturehosting.com/images...e/dsc02905.jpg

http://www.picturehosting.com/images...e/dsc02906.jpg

http://www.picturehosting.com/images...e/dsc02909.jpg

http://www.picturehosting.com/images...e/dsc02908.jpg

http://www.picturehosting.com/images...e/dsc02907.jpg

http://www.picturehosting.com/images...e/dsc02911.jpg

http://www.picturehosting.com/images...e/dsc02910.jpg

http://www.picturehosting.com/images...e/dsc02912.jpg

http://www.picturehosting.com/images...e/dsc02913.jpg

So yeah, that's about it for now, I'm vaccing it out, and will pressure test it in a bit. I don't know if I'll have time to deal with charging it up until next week or not, but we'll see.

I made it fit on that plate which is something I was really hoping for. I don't know if anyone noticed the slhx ;) but I'm hoping that it will do just enough to get me some good separation without going overboard.

Cheers

Gray

I'm impressed... so thats what you were doing last night lol good luck gray you have a winner there

I see a solid suction line! Seems we all did learn a bit bout Cryo_Tek.

Gray, this autocascade looks really sweet ! Good luck with first run

Well it's working well enough so far, getting the basic charge close enough was a pain (as usual) but currently I'm sitting with no load at around a 190psi static (little high, but could be worse) and running wtih no load around 250psi high, and 3" or so low in vac. AMbient is finally down to around 25c or so, it was getting close to 40c in the shed today :eek: not your average North UK weather.

Compressor is running around 90-95c, which for a rotary is just fine with me. It's got a temp cutout for 150c, so I'm nowhere near that.

I'm autocascading anyways, and that's half the battle. The other half is finetuning the load charge for best temps, not easy at the best of times. I'm going to do what I normally do first, use the 150w tester to set it up, then as per the rules I'll have to sacrifice a cpu under it's coldness for testing :D (If we're still putting these things onto cpu's. I am still not sure about whether it's that, load tester, or just whatever we feel like doing :D )

Some pics...

http://www.picturehosting.com/images...e/dsc02915.jpg

http://www.picturehosting.com/images...e/dsc02917.jpg

http://www.picturehosting.com/images...e/dsc02918.jpg

Yes, my shed is a little cluttered, I was focussing on making this work, not on cleaning up :rolleyes:

That's the ghetto insulation, and I will be dressing some weak spots up that I've noticed, and likely doing the full foam treatment on the HX. I only had some very large 9mm armaflex piping and I know that's not really enough to keep it insulated well.

But it's autocascading well enough for the moment, and I'll be doing more soon for both insulation and for load tuning and charging.

I'm hoping to see similar performance to the last one without the compressor overheat problems, of around -70 no load, and -60 load at 150w. If I can beat that then I will be very happy, but we'll see ;)

Cheers

Gray

Looking good gray!

I've always wanted to build an autocascade - i'll add it to the list of 1000 things i want to do when i got some free time next lol!

nice job gray!

very nice gray....
The unit promises....:)

hi, Does anybody know, how will work R507 with CO2 in auto-c ?

Glad to see you guys are still on the fronteir of the autocascade field :D

I should be doing work on my auto-c soon, have to play with my new oxy-acetylene torch.

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hi, Does anybody know, how will work R507 with CO2 in auto-c ?

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I think its going to make condensing co2 a bit harder. R507's a lot harder to condense then r22 or propane.

Uhhhhh....hard weekend I had !

I thinked really serious about quiting the competition, because I didn`t know how to tune good that auto-c...still I had bad temps on evap, no matter on what gasses ratio ite...

Evap temps sucked really, but I heard, that in evap suction line is very, very big amount of refrigerant...It was something like a river in suction line :) But I put evap to my ear and I heard....small and quiet "pssss"...WTF ????

I taked thermocouple in my hand and checked temperature few " from evap...-50*C without any tuning ! And evap temp ? -25*C.

I bought this evap from my friend, huh, now I see, that evap really sucks ! Today or tomorrow I will change it and a little bit change a auto-c layout and I will fight with it :)

Cheers

Try a large cap in cap evaporator with lots of space.
You could also possibly have high stage gas exiting with the low stage gas thus lowering your evaporator temperature.

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Originally Posted by n00b 0f l337

You could also possibly have high stage gas exiting with the low stage gas thus lowering your evaporator temperature.

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Yeap, I could, but I think that in evap is very, very small amount of refrigerant, or when gas is going thru cap tube and it runs to the evap...it`s going (I don`t have any idea how, maybe evap design is bad?) no to evap, but to suction line exit in evap and boils in suction line, but not in evap.

So that why I have bad evap temp, my evap is now suction line :D

about one I`m pretty sure, I will change evap, I have one more from my cascade, it should work well

I have changed evap and cap tube lenght (now it`s 3m) and we have effect:

http://gorajec.net/lukexe/autocascad...c/P1070178.jpg

I`m happy :)

Never be happy always try and go colder! :P

My purpose is to see -70*C on evap :D

damn sexy stuff, 70 loaded and workable for some years not just weeks or moths, is a good aiming poit

any1 can help me maybe i will join in the future.
got acces to r11 r12 r22 and r23 3stager? what oil? other gases too...
thx

The problem currently with Luke's is that you can acheive those temps with r402a and a 1hp rotary. :(

But not with R22 and that suction pressure

I added HX before phase separator, I hope that will help me with separation

It helped a lot ! HX before phase separator rocks !

BTW, there is 7 days and 1 month to end of this competition :) I can`t wait to see few working auto-c :)