Yep, I've tried to explain it before as Cryo-tek had explained it to me, but I just sounded dumb while doing that......:p:Quote:
Originally Posted by n00b 0f l337
Printable View
Yep, I've tried to explain it before as Cryo-tek had explained it to me, but I just sounded dumb while doing that......:p:Quote:
Originally Posted by n00b 0f l337
I worked it out actually with a Chemistry professor I know, talked with Jinu as well when I figured it out and also told Ricky.
Doen't need perfect just understandable mate ;)Quote:
Originally Posted by 404Power
I'm interested in seeing how they've applied that knowledge.....Quote:
Originally Posted by n00b 0f l337
O.T. - Jin...when you catch this post -> CALL ME...
Jin doesnt have r14, and Ricky maybe using it in the third stage of his 3 staer.
If we :kissbutt: and give him a :buddies: do you think cryotek will visit us again? :D
Hmm those designs also look close to what I talked alot with LukeXE about, basically a aux condenser and a subcooler is needed with a very very low pressure refrigerant to work well.
I'll give him a call later ;)Quote:
Originally Posted by runmc
I see ... no problem! :D :)Quote:
Originally Posted by Xeon th MG Pony
Ummm....cryo-tek had already explained such an autocascade. Mytek just made it bit more clear :p:Quote:
Originally Posted by n00b 0f l337
Yeah but I'm stating that although cryo-tek is incredibly valuable, these designs are "basic" autocascades and are already pretty easy to figure out.
OK .. I'll post my design @ this thread for now! :) If this is not OK, please tell me and I will open a new thread! :) Just want to ask some general questions ... if I have some specific questions @ my auto-c, I'll open a new thread! K? :)
http://img412.imageshack.us/img412/1...lannew2cf6.png
1.) question I wanted to ask:
Do you think a oil-sep is needed in this unit? I already asked a few people ... 50% told me YES, 50% No! :D ... so don't know! Would like to here the opinion of an expert! :)
2.) Sorry to ask this "dumb" question but I really don't lnow what you mean by the term "Aux-condenser"!? :(
3.) ... to be continued ...
TIA for all your answers for now! :)
regards
-404
1) Yes, simply becuase phase seps wont capture all the oil with the first stage refrigerant.
2) An auxillary condenser is generally a refrigreant with a boiling point close to or a bit less than the ambient temperature, it acts almost as if its another condenser.
3) Go on ;)
As for your diagram, the first plate hx would be your auxillary condenser if you add an auxillary refrigerant, (like the r600 might work)
No dumb answers (unless you've already been given the answer multiple times:slapass: ). I use the term "Aux-Condenser" (short for Auxiliary-Condenser) mainly because this is the way it was taught to me. Although it does make sense in a way, since it follows the primary condenser (which is shown as air cooled in the diagram), and doesn't have any kind of cap tube or expansion valve feeding it (unlike the Cascade-Condensers). Essentially it continues the condensing process initiated by the primary condenser, by utilizing the cool gases returning from the upper stages. I know it is technically a heat exchanger.Quote:
Sorry to ask this "dumb" question but I really don't lnow what you mean by the term "Aux-condenser"!?
On face value I would say it does, assuming that R290 and R660a are not good solvents for oil (I don't have this information available, so I am guessing on this part). If you can use at least 1 high boiling point refrigerant that is a great solvent for oil, then you can rely on the 1st phase separator to return it to the compressor for you without causing problems in the colder stages. If not, then a full flow oil separator is your best bet.Quote:
Do you think a oil-sep is needed in this unit? I already asked a few people ... 50% told me YES, 50% No!
Also be sure to use Zerol 150 or similar for your compressor oil, since this has a lower freezing point than conventional compressor oil.
BTW nice 3 cascade design with subcooler, and nice drawing to boot:clap:
Nice drawings there 404Power. What is the purpose for the second solenoid valve after the first phase separator and the second plated HX?
OK .. no more dumb questions! :D ... anyway Thanks a lot! :)
@ oil (-sep):
If I'm right know, I think that both, R290 and R600a, a really good oil-transporters! :D So ... if I understand your post correctly, you mean that if I use at least one refrigerant that is a great solvent for oil, I can leave out the oil-sep + the first solenoid valve and make a direct connection between bottom of the first phase-sep and the suction line? Am I correct? :)
... and ... Thanks for your nice words @ my design/drawing! :)
regards
-404
EDIT:Thanks! :) As I know, it really helps a lot to shorten the cool-down-process in the first minutes after starting the auto-c! :) First, you keep it closed! ... a few minutes after booting-up, you open it to disengage the way to the whole auto-c (sry, but I had a few problems now to explain this in English! :()Quote:
Originally Posted by marru
Yes, i kind of had that comming but i was not sure. I guess with a 3 stage autocascade that little valve is a must. It reduces the transitory period significantly. Thx.Quote:
Originally Posted by 404Power
Yes R-290 is a VERY good oil carrier!, to the point that to use it you usually need a slightly more viscus oil for good lubrication.
Thanks for your reply! ;) :) I'll edit my diagramm in a few minutes! :DQuote:
Originally Posted by Xeon th MG Pony
EDIT: POST UPDATED!
Hey Mytekcontrols!
1)What type of compressor do you recommend me? A nice rotary, a normal hermetic compressor like Danfoss SC** or a scroll?
2) If I would use R22 as my "first" refrigerant, is it possible to use a TXV? I think and saw in cyro-teks picture only captube...
Thanks for answer ;) !
Welcome to XS mytekcontrols!
I along with lots of other members, are very happy to have someone like you in the forums! It would be great if we could have cryo-tek back too :D!
I also have a question... what other refrigerants are there like R-123 that boil at room temperatures?
Thanks,
Brett
R-11 if I recall correctly banned through out most of the 1st world nations but still availible in the US.
I've got a pair of solenoids installed on my auto.....While they do help in "pull-down" times for the unit, the greatest benefit I get from them is the ability to switch each of the evaps on/off. I recently powered up the auto to see if it was still working well.....needless to say, it's still running perfect. After giving the unit about 20-30minutes to warm up, I hit the switch for the solenoid and temps go from ~+20C -> ~-110C in approx. 1 minute flat :cool:Quote:
Originally Posted by marru
Beautiful s7, yeah I like solenoids for that too.
@Xeon, I got a can of r11 (14 lbs) not a drum, a can. That I picked up just for Aux condenser purposes.
Ah well you're in the states, so It is I'm sure more availible, as far as I'm aware it is compleatly banned in Canada, UK, Europ in general.