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(UPDATED) 3.2 kw chiller unit as a school project - Page 4

post #31 of 45
Thread Starter 
yep i use a 25 precent co2 75 precent argon mix wich works pretty good no oxidaition inside the pipe that i can see when i test braized some pipe to see how it came out but i dont have anymore so the school will refill the bottole at AGA after christmas since i need to do other stuff like making presents since im a cheap bastard xD and waiting for the plate hx to come...
post #32 of 45
Nice brazing there C-S.. who brazed that compressor? tongue.gif I agree with NoL on not using flare's for braze joint. They are much weaker and run the risk of cracking from vibration. I'd at least avoid them on the discharge line from compressor to condenser.

I saw your vids. Unit is looking great! The space appears a little tight back there for the HX + insulation and TXV but I'm sure you'll manage. I would be very proud of that braze joint on the filter too! biggrin.gif Way to go with the 100% recovery or 410a! thumb.gif

You probably already know this but just in case.. make sure to use at least 35% silver on Plate HX.

Happy Holidays!!
GRX
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post #33 of 45
Thread Starter 
well its bien a while since ive posted here o heres a lil update biggrin.gif. So i got lots done and the hest exchanger came in the mail

well this is going to be a mess xD newspaper EVERYWHERE

mehehehe 120 euros c: not expensive for Norwegian standards :3
OMG I CANT WAIT TO SEE THIS BAD BOY





looks really nise and has good build qualety too biggrin.gif germans know what there doing smile.gif
heres a test layout to see that the pipes are the right dimention noot to big so they dont fit and not too small so i cant solder them on good

here im trying to figure out how to insulate it with out it looking like a total hack job
so me and my awesome teacher fugured hell we will just make an insulated box for it to be in and heres the result biggrin.gif

btw the bottom needs insulaition too

and heres with the hx in and top insulaition but no top cover....yet c:
heres a test fit with almost everything in there i have good room to work with (:< IMG_20130118_112949_zpsb79dbf7e.jpg
AND FINALLY the school got me some NITROGEN biggrin.gif and a proper regulator

and i braized the refrigiant side of the hx with tome awesome joints and remember everyone ive ben braizing for like 2 weeks now so i havent had ANY traning what so ever on how to do it so i thing the joints look pretty good for a N00b btw i had a good flow of solder down the pipes i used quite alot of 40% cuSn rod to get it deep in to the joints but no overflow in to the hx wich is good and presshure test at 15 bars and the water bath off truth aaaaand its leak free biggrin.gif thats a wet hx lol
AND A BIG THANKS TO buskerud kulde a local industrial hvac place for donating 1/2 inch and 3/4 inch pipe and 90 degree bends and some more silver solder THANKS GUYS i really apreachiate the help c: also cabinet progress whith my new dremel made cutouts for temperature controll and on/off switch looking real good parts soon gonna be sent to be powder coated matt black biggrin.gif thats all for now and as always stay tuned for more wink.gif exo signing out

ps. the compressor was my third and fourth braze so naturally it was bad i just dident bwant to contaminate the oil with any un neca sarry moisture but also one last quiestion why shold i have a solinoid to the txv ? in my eyes it will just couse unnessesary presshure drop on the high side? correct me on this please c:

okay last edit for this post i just got a ip65 classifies braker box and a slow 16A breaker for added not burn down house security biggrin.gif

Edited by cooling-storm - 1/20/13 at 12:31pm
post #34 of 45
Yeap boxing it is a much easier way to go. Keeps it clean in case you ever want to use the part again, keeps it airtight hopefully as well. Make sure you seal that box up nicely though. It should be VERY snug, aka pressed in.
post #35 of 45
Thread Starter 
one quiestion why shold i have a solinoid to the txv ? in my eyes it will just couse unnessesary presshure drop on the high side? correct me on this please c:
post #36 of 45
The liquid line solenoid is used to prevent the large amount of refrigerant held in the condenser and receiver from migrating to the evaporator during the off cycle. Without it, that huge evap will be flooded upon startup and will most likely overwhelm that small accumulator... slugging the compressor. There is no pressure drop to worry about with a properly sized valve. The only concern would be the pressure differential between the high and low side upon startup. If the differential is too high then some single phase compressors can have trouble starting. In that case a hard start kit would be needed. You could also just have the valve open shortly before the compressor starts(maybe 15-60seconds). That would require a time delay on compressor contactor. Install it and see how it runs first.

You do great work!

Thanks for the update!
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post #37 of 45
Thread Starter 
well its a while since i posted here couse of other projects like an hho generator and other bits and pieces and waiting for parts but i need another solinoid wich is really expensive so i donty know what to do now bot ive got alot of things sorted out now like hx placement and started to solder things together but the fan is running backwards now with the runcap both on and of phases changes i just dont get it ? well it ran the right direction when i tried it the first time? so i might har reverse polarized the motor some how D: so i need to fix that ... but so far so good c: btw heres some pics of progress



thats all for now:)
post #38 of 45
It's coming along very nicely c-s! What's wrong with your solenoid? It only needs 1 ton rating.. pilot type are best. I see you routed suction line up off of hx and then nice "u" bend. You could try without solenoid first and see what happens.. just keep total charge at minimum.

I'm sure you prob figured fan rotation out by now.. was it reversed leads on capacitor?

Keep up the good work! thumb.gif
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post #39 of 45
I just read the whole thread, amazing job! thumb.gif
post #40 of 45
Is it now a working unit?
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Overclock.net › Forums › Cooling › Specialized Cooling › Phase Change › (UPDATED) 3.2 kw chiller unit as a school project