I don't know if this has been posted here, but I saw it somewhere and wow it is REALLY helpful:
http://www.jwharris.com/jwref/procs/
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I don't know if this has been posted here, but I saw it somewhere and wow it is REALLY helpful:
http://www.jwharris.com/jwref/procs/
heres the autocascade. didnt work great but hey it was autocascading. not bad for a 2nd try. -60c in a positive pressure on suction.
hey guys check it out. www.captaincascade.com
You cool the compressor with a additional cooling loop ? I see it wrapped with some hose
Wow. Nice logo, CC. :DQuote:
here is my new toy. its much like charlies but alot bigger. and designed to chill liquid to -140c. Its got a big ass 3 phase bitzer in it:D. wich is something ive always wanted. Much like charlies it is empty of gas, and on the tag for refrigerant type it says "polycold".
Its fine by me, i didnt really plan on using it the way it is. i just wanted to gaze at its inards, and maybe steal that beutiful bitzer. 10$ on ebay. score!
$10? Damn! I bet shipping was a :banana::banana::banana::banana::banana:. Can you handle 3 phase power?
:toast:
it was local:D yeah i have 3 phase at the shop:D:D
cool! :thumbsup:
Nice system dude CC :)
Well, fit a nice evap to it and go for -150 ;)
autocascade completed. will have pics tomorrow. not working as well as i would like it to, but hey it works. ill start a thread about it since nobody looks at my poor old thread anymore.
Yep mine is completed too, and it isnt working as well as I would like either, but it is only a little 1/3hp copeland.So I cant expect too much.Also not real sure about the efficiency of the nitrous oxide.
They are interesting little beasts.
he did finish before me. but doesnt mean that he isnt wearing a sundress like a cute little girl
hahaha
Okay mr. barbie helmet. :D
We still read your thread Cappy....this is just what you need to perk it up! :D
that was an isolated insedent!Quote:
Originally posted by aenigma
hahaha
Okay mr. barbie helmet. :D
ok heres the top view. i got to -75c with 1 compressor. and it was autocascadeing because suction was in a positive pressure
Taking it to Lan parties?:D
CC, how much does cooling the compressor help you (not evap temp - compressor)
I believe the only reason he was doing that is because the compressor was hot enough to boil water, so he was worried about it.Those high compression ratios are murder.
I dont think there would be much of an improvement when cooling the compressor unless it cooled it enough to considerably drop discharge temps and pressure.The only improvement would probably be more life from the compressor and no burning the oil.Which in my opinion is a good improvement. :)
But you definately do not want to cool it too much(enough to cool discharge line/oil sep below SCT of 1st stage refrigerant) or else you will condense the 1st stage refrigerant in the oil seperator.That is why the oil seps are insulated in autocascades.
I just thought i would share an idea with those of you building your own systems.
For an enclosure for your system, you'd want something sized like a prommy right?
how about a 19' craftsman tool box? or even a u.s. mail box?
cut off each and and toss some perferated metal on there for ventalation. and there you go.
ok, as you may or may not know. my three stage is not working properly. And i think i have gotten to the bottom of it. This was something very stupid of me not to antisapate. In making my own heat exchangers, i have not asured the where equal in size. What is happening is my 2nd to 3rd stage heat exchanger is much larger than my 1st to 2nd. so, my2nd stage is picking up alot more heat than it can reject to my first stage. it kills my first stage innerstage. and the 2nd and 3rd stage pressures rise astronomicly. this also aplies to autocascades. they dont have to be exact, but the heat exchangers should be close in size. when using a multi stage system.
lmao......hold on a sec...........hmmm
The 3d stage picks up the heat load (device cooling + heat through insulation) and then adds heat of compression (25-50%), so the 2:3 HX needs to be large enough to handle this. The 2d stage picks up that heat load, adds more insulation heat load plus more heat of compression, so the 1:2 HX needs to be larger than the 2:3 HX in order to handle the increased load.
I'm not sure this is true for autocascades. It seems to me that autocascade HX's need to be about equal size.
my three stage hurts
I feel its pain. :(
Maybe you need to swap the two heat exchangers, so that the 1:2 is larger than the 2:3.