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Yes and no, in each hole I have a little cup at bottom, so there is about 1mm little wall between each hole for added surface area. I initially drill to about 4mm within base, then remove channels and back to drill press and take about 1mm more off each hole to bring base to 2-3mm.
There is a lot more surface area in this drilled evap than one done by a mill.
Block it 18mm high total with lid.
looks just like mine :), however im having a hard time finding 2/3mm top plates to fit. They have Thermaltake & others on the net but not paying $10/$15ea for a 3mm plate of copper when I bought 10 x blocks of copper 50mm X 50mm X 30mm for $7 ea & that's cut to size! They dont cut them 3mm for some strange reason, they said that there machines cant cut them that thin?Quote:
Originally Posted by kayl
C-BuZz
Cbuzz is that for your vapour chill mod over at OCAU.
yeah copper in raw form is only about $10 kg.
when they cut the blocks did they lap them for you as well?
(i know my first lot of copper blocks i got from Melbourne faces were ruff as)
you wouldn’t believe how long it took me to lap them flat.) the grooves from the saw that cut them were quiet deep.
i took the other 7 blocks to a local buy and had them lapped.
the place you got your copper from, im sure they will have copper plate 3-4mm thick.
should get that cheaper than the copper bar.
My friend (local) that i get copper from now will one day find out how to program the cnc machine. and i will have round evaps.
Quote:
Originally Posted by wdrzal
Im on GMT of +8 :toast:
but i work mostly late wednesday/fridays nights to wee hours
desuperheating your secondstage discharge with the secondstage suctionline, is that really worth it? Won't that just add more heatload to the secondstage and negativly effect temps?
pos pc crashed. managed to take a screenie of my post though! lol i was to lazy to type it out again.Quote:
Originally Posted by kayl
hmmmm yes and know, if you look at the cascade stickies they are used in both the first and second stage of a cascade. If they are needed or make the cascade work better is questionable I must agree.Quote:
Originally Posted by Jack
In a cascade if the cpu evap is -100c and the suction line before the compressor is normally still -80c or colder.
So I lengthen the capillary line to make it more restrictive to get less flood back to the compressor and now temps arnt as good at the evap, too restrictive and not enough capacity for 200w or so.
You have all that cold happening in the suction line and it isn’t being used for anything useful.
You could also add a few feet to the second stage suction line to have the same effect (reduce the flood back to the compressor)
This is why building cascades are so much fun, there is no guides to what works best, just different ppls findings.
i have built a few cascades and they work well with or without suction line hx.
-9xc at load, not a -100c loaded cascade yet, and that’s what I want, so I have to try different things till I get there.
For my co2 cascade under load my evap was around -70c or something around that, and the suction line before the compressors was actually colder -8xc. I was using quiet a short length of capillary line, and if I lengthen the capillary line the system didnt have enough suction to cope with the subliming that happens with co2, and loaded temps benching arnt as good.
After adding a suction line hx (inside the actual pipe hx) I gained more capacity at the evap (colder temps as well) and now the suction line was around 8K of supa heat which is ideal. But having the suction line HX inside the hx just doesn’t make sense but it worked well. So hopefully having the Suction line hx separate to the hx will further improve my loaded temps in my new cascade.
Its easy to get -100c noload but it takes a good cascade to get -100c loaded benching ya pc, and you don’t seem many ppl benching -100c these days using bench applications other than supa Pi. 3dmark2001 is what I like to bench mark against looping.
c-buzz look forward to ya phase change thread when you start it.
i think there is one spot that is real clse now that i look closer.Quote:
Originally Posted by stockhatch
i am holding off on evap (lazy) until i get some $$ and will soon have a new evap design ready i hope.
dont want to waste insulation toying intill got most parts.
i insulated the hx tonight though with expander foam, it got a bit messy but ill chop it back.
http://www.xtremesystems.org/forums/...id=37147&stc=1
http://www.xtremesystems.org/forums/...id=37148&stc=1
did a little work on the cascade tonight.
decided to put the condenser on top of each other instead of under the heat hx.
I still need to chop the pipes off the top of the rotaries to make it shorter.
the cascade has got a set of wheels now :woot:
End size should be 60cm long 38cm heigh and 40cm wide ;)
http://www.xtremesystems.org/forums/...id=37233&stc=1
http://www.xtremesystems.org/forums/...id=37236&stc=1
http://www.xtremesystems.org/forums/...id=37235&stc=1
:slobber:Quote:
Originally Posted by kayl
Damn small!
Looking good, as usual :D :toast:
A bit ghetto but as Jack said it is very small. Looks great. Looking forward to see some nice results ;)
Coming from kayl, it's always ghetto ;)Quote:
Originally Posted by SustaiN
but nice and small, this one. i like it :slobber:
love your work kayl
cant wait to see some results
nice condenser, where did you get it from?
Thanxs guys, yeah its small but getto.
When its finished its going in a box, so it wont matter what it looks like on the inside,
It how cold it gets.
The new guy I got the condensers from chilly almost a year ago.
I did all the wiring and finished first stage.
I used about 1.95m of 0.031” capillary line first stage, refrigerant is bbq r290 as usual.
Second stage im going to try 0.0355” and start off at 3.6m. I just waiting on a new evap and some copper pipe and end caps to finish second stage.
http://www.xtremesystems.org/forums/...id=37393&stc=1
http://www.xtremesystems.org/forums/...id=37394&stc=1
http://www.xtremesystems.org/forums/...id=37395&stc=1
you got bbq propane down to -60 :shock:
impressive
Quote:
Originally Posted by Sneil
thanxs sneil, on me c02 cascade i had first stage at -66c hx out with it loaded by secondstage at -100c :toast:
loaded im hoping for around -45c though slight vacuum :stick:
did some more on the cascade.
this is the lowest temp so far.
decided to just use an old evap for now.
plan to load it Friday and tune it properly :toast:
first i tried no second stage desupaheater to make it neater.
but seconstage line to hx was quiet hot and after time cascade temps fell -9x's :mad:
it hard to decide (while no load testing) to run 3-5psig or 10hg without actually loading it real load to know how much charge.
no more tunning inside the house now says the boss :( (wife)
http://www.xtremesystems.org/forums/...id=37648&stc=1
poor you :slap:Quote:
Originally Posted by kayl
Nice work so far :toast:
I'm starting to look around for 1150 now, after the next couple projects I'd like to work with more like -90 loads instead of -75. That last R23 Cascade just held -75 but only 120-130w or so.
Really compact design, and despite being somewhat ghetto it's doing just what it's s'posed to :woot:
Looking forward to your tuning and load results :cool:
Gray
Kayl is the propane god :toast:Quote:
Originally Posted by Sneil
Nice cascade as always kayl, but have you ever heard of pipe benders? ;) When will you get to see load temps?
awww... pipe benders... I don't like it too much most of time myself. Maybe because I have cheap one but when making 180 degree bends for 3/8" pipes, I do get some concave shape which I don't like... :P
i know its cold in the shed damit :mad:Quote:
Originally Posted by TTmodder
thanxs garry, yes -7x temps gets boring quick doesnt it, i know when i was doing co2 all i was think was i want -100c have to find ethylene.Quote:
Originally Posted by Gray Mole
that is some nice temps though for the refrigerant ya using.
Getto is the only way for me, as hard as i try it never look new does it.
But its how the cascade is built that matters as you said.
Loading and tunning as we speak, installing windows on me epox mobo
and into the shed it goes to bench and tune. :toast:
noload its been running an hour and at -96c 1Hg and 205psig -45c hx out temps -44c liquid out temps 2nd stage.
just need to add a little insulation to the evap (its really cold on the outside of the evap lack of insulation)
yeah i would love to see what r507 does on this thing.Quote:
Originally Posted by afireinside
If it doesnt leak in a few months ill pay someone to charge it for me. :toast:
pipebenders, its hard to believe , but i actually did use one in most places (tight areas)
yes jinu117 i got those same ones, every 3/8" it puts nice crease in pipe and 1/2 goes flat a little, but it works :clap:
http://www.xtremesystems.org/forums/...chmentid=37711
this is idle going into bench.
I tunned it for 1.5Hours playing around 0-3psig.
then at end i tried vacuum.
likes 10-15hg for sure.
only problem is the second stage overheated.
i need to add a fan to cool the rotaries.
i have done it in the past cause they go over 100c
after a few hours
http://www.xtremesystems.org/forums/...id=37713&stc=1
http://www.xtremesystems.org/forums/...id=37714&stc=1
http://www.xtremesystems.org/forums/...id=37715&stc=1
ABSOLUTELY AWESOME!
I love these rotarys! :D :banana: