SS->Cascade conversion, comp reuse?

[boostedevo]

I have a Chilly1 SS that I was thinking about turning into a cascade and am looking for some feedback. Money is quite the issue so I'd like to reuse whatever parts that I can off of it (it's fully functional), but I am looking for some feedback from experienced cascade builders on what I might expect for performance and any possible pitfalls.

I tried finding specs for this compressor when I first got it from Reggie a couple years ago, but couldn't. I vaguely remember doing the math and coming up with something between 1/4-1/3HP.

http://i10.photobucket.com/albums/a125/boostedevo/chilly_comp.jpg

So if a cascade was built using maybe a 3/4HP comp on the first stage in conjunction with this (say 1/4HP for sake of underestimating) comp, what kind of performance do you think it might have and would there be anything "odd" that might occur using two comps of such size difference?

Any thoughts/help is appreciated!

[[XC] gomeler]

Using a 3/4hp compressor with that tiny compressor would be a gross overbuild on the 1st stage. That compressor is more in line with 1/6hp to 1/5hp. Here is the PDF on Embraco's R134a compressors, your compressor is down on the 9th page. I'd say it's a bit weak and too small displacement to be an effective 2nd stage compressor on anything but a low power cascade.

[boostedevo]

Thanks for the response XC. I guess my math or my memory sucks...thought I remembered it being ~.27HP when all was done, but that was a while ago. I don't see the PDF/link, but I'll take your word for it.

So a substantially larger 1st stage generally isn't going to make up for the very small 2nd stage I guess is the short answer that I was looking for. Out of curiosity, can you give me your definition of "low power cascade" in terms of temps/loads just so I have an idea what you mean?

I kinda figured, but it sounds like doing the conversion is a waste of time starting with a comp this small...and it's even smaller than I thought it was.

Thanks for the input!

[[XC] gomeler]

Crap, forgot the link!
http://www.embraco.com.br/portugue/produtos/02003.pdf

Believe your biggest problem with such a small compressor will be the effective cc/rev and it's ability to pull a decent suction "vacuum". Don't just take my word on this issue though, I'm sure someone has used a similar sized compressor in a cascade (maybe?). I myself just wouldn't use something that small going by my limited experience in cascades.

[boostedevo]

Thanks for the link. That's why I posted before making any decision...looking for opinions from people who know a LOT more than I do on the subject.

I appreciate the response and look forward to more thoughts from others, but I am sure you're thinking is probably in line with what everyone will say ;)

[n00b 0f l337]

Basically Gom is right, definitly too small and would be a huge limitation in a cascade. Also such a small compressor you have to worry about burning it out under the higher stress of something like ethylene.

[[XC] gomeler]

I imagine you could use it for a GPU cascade, get two of those little guys together and run something like R290/R170 or R290/R744 and hold a GPU at ~dry ice temps.

edit: or substitute your own variety of gases, I personally prefer non-chlorinated gases.

[boostedevo]

Thanks for the replies. I hardly ever have GPUs worth extreme cooling and certainly don't right now :) I am not going to bother with the comp from the SS, it's just not worth it to go through the hassle and then have mediocre performance to save some $$.