rotary cascade

[tim-]

long time no post.

have been working on a new unit for a friend last couple of days, since tuesday to be specific when i got the last part for the unit.

its a 2stager with 2x14k btu brand new rotarys (free ones), luve 273, 12plate HX, a big cube desuperheater for second stage, highpressurecutoff, pressurerelieve valves on both stages, tev on first and capillary on second stage, hotgasbypass will be installed, 1.75meter of flexline to the 42mm dia stepper evap. will start with r404a/507 on first stage an r1150 on second stage. everything will be fitted in a sweet black case supplied by cold_ice (belive it's a lechuck production), picture on it later.


http://phasechange.se/photos/units/ovalies_rotary_cascade/DSCN0058.JPG
http://phasechange.se/photos/units/ovalies_rotary_cascade/DSCN0059.JPG
http://phasechange.se/photos/units/ovalies_rotary_cascade/DSCN0060.JPG
http://phasechange.se/photos/units/ovalies_rotary_cascade/DSCN0062.JPG

some electrical wiring, and more to come!
http://phasechange.se/photos/units/ovalies_rotary_cascade/DSCN0061.JPG

[piotres]

Looks fine :)

Can You write more about bypass ? In what way You want to mount it and what valve You plan to use ?

You plan to mount this bypass only as a weapon for coldbug ? :)

What TXV and nozzle You're using :) ?

Thanks
Best Regards
Peter

[tim-]

Looks fine :)

Can You write more about bypass ? In what way You want to mount it and what valve You plan to use ?

i will braze in a tee before desuperheater with a outlet for a solenoid, from solenoid a 1mm id captube will go straight to evap (parallell with the captube with liquid refrigerant), basicly ~60*c gas straight to evap, will be alot colder when it hits evap. i have to play with the captube dimension, might need to go up a size but i think this will be okay actually.. will try and eventually fail.

You plan to mount this bypass only as a weapon for coldbug ? :)
basicly, yes. if it's open it will also speed up the equilization between highside and lowside but not a main reason for use, as long as captube isn't blocked it won't be any problesm with that. from peoples experience the new quads can be used in the -135 -150*C region but can have a cold boot bug above -90*c which is hotter then i expect this one to run.


What TXV and nozzle You're using :) ?
alco tis-sw with a 0 orifice installed at the moment. I also has the 00X and 01 and 02 in case this won't be the best choise..

Thanks
Best Regards
Peter



regards
Tim


http://phasechange.se/photos/units/ovalies_rotary_cascade/DSCN0068.JPG
flexline+evap pressurestested, insulated and lapped :)

[piotres]

Hym...we'll see how this type of bypass will work :rolleyes: .

Doesn't You think it'll be easier to tune gas amount going by bypass by using thicker captube like 2.0 mm and handvalve (without solenoid) ?

[tim-]

that's not an option. thing is that this one will be mounted in case as already mentioned and i don't want any extra holes in the case.

but a captube of 2mm id would be a little to unrestricted, i want it to solve the coldbug-issue and be quite fast to jump down in the -100 region again.. it's enough with -60-70*c during bypass if you understand what i mean. but i can see an option between my and your idea, a needlevalve after the solenoid with 2mm id captube to evap.. but thats to complicated and out of the question.. also a 2mm id captube wouldn't allow as flexible flexline as with 0,9+1,0 captube.. thats also something to keep in mind.

cheers
Tim

[teyber]

Thanks for posting this tim-! I love it, case is also incredible...

Keep us updated. Beautiful work...
regards

[DagoDuck]

It looks very similar to the cascade of cold_ice. Very nice work, indeed! I would like to see some cold numbers on the thermometer. Keep up the good work, my friend.

[Sneil]

Beautiful work there tim! Where's the case teyber speaks of?

[godmod]

Nice pipe routing there. I like it, please keep us updated -tim!

[tim-]

dagoduck:
the case comes from Patrick (cold_ice) and i also ordered the condenser together with it since it is what the case is made for. then add rotarys, plate HX and a desuperheater and you have how a 2stage cascade for our perpose looks like overall. it's no doubt most 2stage cascades here is simular. both to performance and also look. some afford more time for pipework and planning to make it looks clean ( i do belive i have done a pretty good job on that part) and some put less time on this since it doesn't really matters due to performance (it's still in case, noone will see it anyway).. i've choose the parts (expect the condenser) after the availibility, price and performance and i guess it's pretty simular to other peoples choise..


sneil:
unfortently the case was a bit damaged in the back due to poor handle in the shipping so i have packed it in it's box and waiting for the freight company to pick it up for inspection and refund. but i got some pictures on it when i packaed it up. lets hope they pick it up asap since i want it back to continue and finish the build.

http://www.phasechange.se/photos/units/ovalies_rotary_cascade/tbDSCN0041.jpg

godmod:
thanks :) and yes i will keep you guys updated.. unfortently it has been a little bit to much of the good things in life this holiday which has keep the build on hold. but will continue tomorrow and order some r1150 which should arrive on wednesday if the distributor got it in stock as they had a few weeks ago when i asked about price... otherwise i might has to wait until the weekend before i got it.. and that would be a pain ;)



a flowscheme for all of you ;)

http://www.phasechange.se/photos/units/ovalies_rotary_cascade/flowscheme2stage.jpg



cheers
Tim

[Oliver]

I like your idea tim about the way to handle cbb... also input from peter aswell...

Looking forward to see some numbers.

Keep building it.

[DagoDuck]

@tim- No offense meant. You have performed really great work there! :)