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I'm getting a jump on that auto cascade contest ;) I did my discharge desuperheater real late at night and brazed in my filter/drier to start everything look Okay? Tommorrow I'm making my oil sep, interstage HX, and phase sep and gonna see if I can get at least the piping done by this weekend. I'll also add a steriotypical picture of all the current parts I have for the project.
http://www.xtremesystems.org/forums/...id=19697&stc=1
http://www.xtremesystems.org/forums/...id=19696&stc=1
Nice to see the madness is starting :D
I will startmaking mine as soon as i pass a exam over @ college.
cool cant wait to see it in the making.
word of though though ya should of brazed those driers in just before ya vacuum the system not to spoil it.
Could you please save the proces of making it for later use so no one will copy your ideas :>
Show us the ready finished project :D
Be creative guys :D
Well I want to show everyone just so
1. People who don't know how can learn and enter
2. So I can do mine right
3. So I can tweak it for the best temps possible
@kayl I know I'm suppose to put the filter drier in at the last moment, but I had to do some piping with it so it was necessary. Besides I'm going to quadruple evac the system once it's done. I made alot of progress today, upload pics in a min.
Please carry on explaining and posting bh2k,
We all want to learn, a competition shouldnt stop us sharing ideas, should it?
Regards
John.
The heatexchanger is pretty ghetto and messed up, but it should get me going got a start. I cut myself very badly putting the 1/4 inside the 1/2 so I didn't take time to bend it real well.
http://www.xtremesystems.org/forums/...id=19736&stc=1
I did take the time to braze the edit real well so as to avoid any possible leaks.
http://www.xtremesystems.org/forums/...id=19737&stc=1
The phase sep is a very simple design and I modeled it just like chilly1's drawing which is a pipe in side of a pipe the outer pipe will be for the 2nd stage gas and the 1st stage gas will probably flow in the middle.
http://www.xtremesystems.org/forums/...id=19738&stc=1
The Oil sep is done as well, but I'm letting it cool for now since I just brazed it. I'm also letting my batteries charge so I'll be posting my Oil sep info later. The compressor is mounted on the wood and I'm going to try and get as much piping and such done as I can tommorrow with the little oxy I have left. More updates tonight and later tommorrow ;)
http://www.xtremesystems.org/forums/...id=19746&stc=1
Oil sep is packed with steel wool to catch the oil. Entrace is at the top refridgerent exits at the first pipe and oil returns to the compressor via second one.
How do you control the flow of the oil back to the compressor? If the oil separator returns oil through the service port (secondary suction on compressor) how will you prevent it from acting to bypass the low and high sides?Quote:
Originally Posted by bh2k
By the way you can turn your condenser into a phase-separator by having the entrance half way down, that way the stage 1 gas condenses and goes out the bottom and the stage 2 gas exits the top still as gas.
hey man... the steel wool idea is really cool....
why don't you just have the oil catch on the wool and go through the 1st stage lines? Seems like less work eh?
I've been told that some oil could potentially end up in the 2nd stage lines and "log" in the evap... Any ideas? or do you think that the phase seperator will do the job?
@ Gkiing I'm splitting the condenser, but the one up top is used to kind of subcool the 2nd stage gas before it gets to the interstage HX The vapor that doesn't condense in the condenser rises to the top and goes to this through the ones in the side and out the bottom so it's cooled by the suction line going back to the compressor through the middle of it. Also could you explain what you mean by how I could control it's flow back in to the compressor? The drawing I have has nothing on it, but a strait line back to the compressor. Is there something i'm missing in my creation?
Dunno why but i like the classic idea with the separator after the condenser more...
In chilly1's drawing it just shows the oil that has accumulated in the oil separator going straight back to the service port on the compressor, but doing this would mean that you are in fact making a connection between the low and high sides, which means that the compressor would have a hard time maintaining the pressure difference on the two. Maybe you need to use a small 3/16 line or some captube for oil return but im not sure.
ohhhh, I know what you mean, yea, I'm using a small open shut valve to let the oil back in whenever I want, but keep it closed to maintain pressures.
This is my autocascade drawing that I'm using for the piping
http://www.xtremesystems.org/forums/...id=19764&stc=1
The thing between the compressor service valve and the oil sep is the cutoff switch I'm using so I can open it at well to let the oil back in to the system.
Could you label those parts for me, if you have time? Some of that is confusing me.
Regards
John.
What you have labeled as a phase-separator/subcooling is actually a suction line heat exchanger, it does not separate the two gases. It just subcools the second stage gas which has already been separated by the condenser. Also I think that the coil before the oil separator is the desuperheater.
indeed you hooked up your phase sep to your suction line. That's a bit weird.
ohh okay, lol I'm sorry I mixed my terminology up. Yea that is the phase subcooler. I'm using a split condenser as my phase sep then.
Sorry about the word mixup.
can't wait to see it in action! Where are you getting your CO2 from? I'm still trying to locate a source around here so I can start my cascade. AirLiquide will only sell me a 13kg cylinder which is way more than eneough.
a welding related shop will be your best bet
Yes that's exactly what AirLiquide does they supply industrial and welding gases but they will only sell it in very large quantities, do you know of any way to obtain a small quantity of CO2? I was thinking of making some kind of container to hold dry ice and then vacuum it and pump the CO2 vapour into a tank with a compressor. Would that be a feasable idea?
The only other source I found was a paintball tank of compressed Co2 but I'm not sure of the purity and it may be difficult to fashion a proper adapter and valve for it.
I'm pretty sure the 5kg and 13kg af CO2 cost pretty much the same. At least last week when I called around for N2 theys aid it was the same price for 5l and 10l containers since the cost was comming mainly from shipping:)
[QUOTE=bh2k]The heatexchanger is pretty ghetto and messed up, but it should get me going got a start. I cut myself very badly putting the 1/4 inside the 1/2 so I didn't take time to bend it real well.
ouch i did the exact same thing piped me thumb and got a big flap of skin, it throbs for days and bleeds heaps.
also i love ya avatar.
keep it up, i am having the same problem.
co2 fire extinguisher a though, make a valve and put some into a 9kg gas bottle and keep filling that, or get a regulator.