kayls Autocascade rev2

[kayl]

well this one is going to be smaller.
will test it with 1/2Hp for now. i know how to use co2 now after playing with cascades.
im going to stick with the old hx
just insulate it properly.
i plan to be making a 40mm evap and maybe a 30mm evap for testing cpu the gpu cooler. i cant wait.

one hx is done i will only have to insulate dd evap suction line and maybe about 30cm of suction line. i like this design, very little losses.

[f00t]

cant wait to see it. i'm just waiting for some co2 to get here so i can charge my autocascade. it's also nice and small.

[WindStorm]

Nice heat exchanger. Is this going to be the same principle co2 chamber that Jan is also using? This will make really cool gpu cooler.

[kayl]

Foot cant wait to see ya autocascade. Co2 will bring ya some fun.

windstorm Im not sure exactly how jans hx works, but assume it similar to other hxs being designed for autocascade. I have 3 sets of pipes in there.
Co2 condenser pipe, shell r290 boils in and I also pass the suction line through there.
It’s the one out of the first autocascade hx,
I just attacked it with a pipe bender to make it smaller, will insulate it the same way as I did the cascade.

[Scout255]

good work man, looks great!

[f00t]

i'll post some pics when i get hold of a camera, just for you Kayl

[gkiing]

hey kayl, that looks pretty small for a 1/2hp compressor, what make is it? might just be the perspective though.

I'm working on finding a used rotary compressor so I can fix my autocascade.. 1/4hp doesnt cut it with co2.

[kayl]

thanxs scout55, foot l like pics i cant wait.

gkiing it is small very quiet. would make a perfect cooler, if i can get it to run autocascade.
i wish i had 2 of these compressors, could have 2 side by side.

Brand: L'unite Hermetique
Modell:CAE2420Z
Cyl Volume: 12.50cm3
Capacity at -35: 257w
Capacity at -30: 349w
Low temp R404A @ -10c suction it will move 2000 Btu.
Weight: 13kg

im starting to like pipe benders

[reject]

looking good kayl, wat other gas will be used, bbq propane or hc22/502?

[Tonic]

kayl, should you shot a few good photos of compressor? My looks identically as your,
but, according to technical document, it has ~12ccm motor's displacement and 1/3HP..

It make me unsure, why 1/3HP, not 1/2HP? Model name - CAE2410A, as I remember correctly

Whatever, I love this compressor, it has massive shapes, electricity device
looks nice and loudness level is low

[WindStorm]

Kayl...very compact system. Nice receiver you made. What size cap are you using to cool the hx.?… Man you rock you just started this two days ago and it looks complete

[G H Z]

What is an auto-cascade?

[Tonic]

It's a phase change unit, where is one compressor, phase separator and two gases - one gas cools second gas

First gas evaporates between -30*C and -40*C, second stage evaporates between -50*C and -80*C

[eva2000]

oooooooooh i want one

piccies

[G H Z]

Originally Posted by Tonic

It's a phase change unit, where is one compressor, phase separator and two gases - one gas cools second gas

First gas evaporates between -30*C and -40*C, second stage evaporates between -50*C and -80*C

So a single compressor pumps a gas mixture that is seperated somehow, then these individual gasses are used like in a typical cascade?

[illmatik]

Does the HX act as a subcooler in a traditional system, except that a compressed 1st stage gas will cool the condensed 2nd stage?

I'm still kind of learning about basic stages here, so please correct (and forgive) my ignorance. From my knowledge so far, in a subcooler, the suction line gas will cool down the liquid line to give the system a little bit of a boost? Or are you using a 1st stage liquid that is separated to cool a 2nd stage liquid prior heading to the evaporator?

[Cra$h 0veride]

I believe its the 1st stage condensed refrigerant that cools and causes the 2nd stage refrigerant to condense (usually CO2) then the CO2 moves on to the evap on cpu.

[Tonic]

G H Z, bingo

illmatik, 1st stage gas is condensed. 2nd stage gas is desuperheated (it's cooled by
condenser, but it doesn't become a gas, he's still in gas phase). Condensed gas
evaporates and cools 2nd stage gas.

It isn't subcooling

Cra$h 0veride, you're right

[G H Z]

How is the gas seperated?

Sorry bout the jack kayl, just trying to understand exactly what your doing here so I can honestly say Nice job!

[kayl]

Originally Posted by reject

looking good kayl, wat other gas will be used, bbq propane or hc22/502?

for testing I always use bbq r290, normal single stages I always use hc22/502 cause they only take about 4sec of charge, the autocascade and cascade would take a lot of hc22/502 and I only got a few kg’s left.
If I build a autocascade im gonna keep I will use hc22/502.
But im always changing things so that’s a while off, unless this is a good gpu cooler

Originally Posted by Tonic

kayl, should you shot a few good photos of compressor? My looks identically as your,
but, according to technical document, it has ~12ccm motor's displacement and 1/3HP..
Whatever, I love this compressor, it has massive shapes, electricity device
looks nice and loudness level is low

im really not exactly sure, a while back I posted this, and ppl said it was 1/2Hp, might be a 1/3Hp
Have you a link to that spec sheet talking about.

http://www.xtremesystems.org/forums/...04a+compressor

Originally Posted by WindStorm

Kayl...very compact system. Nice receiver you made. What size cap are you using to cool the hx.?… Man you rock you just started this two days ago and it looks complete

thanxs once I start I have a hobbit of brazing until finished
no receiver used in this one, capillary line is 0.028� about 1.8m 1st stage and about 2.3m 0.031� secondstage.

Originally Posted by G H Z

How is the gas seperated?

Sorry bout the jack kayl, just trying to understand exactly what your doing here so I can honestly say Nice job!

That’s cool, after the gas leaves the compressor passes to the condenser, then it enters a map gas cylinder about 1/3 way up bottle. At room temp and this pressure r290 will condense into a liquid and collect at the bottom of the cylinder. It then feeds via capillary line to hx (1st stage) -30c.
Back to the map gas cylinder now, at room temp and this pressure c02 is a gas and exits the top of the map gas cylinder as a gas. It is then passed through the hx where its cooled and pressure is reduced and it is able to condensed into a liquid and the fed by capillary line to 2nd stage dd evap to freeze -70c –80c hopefully.

[illmatik]

So when you are tuning/experimenting, are you guys reclaiming and refilling the system each time you need to say, do a cap tube adjustment? I would assume flares need to be brazed/soldered each run due to the psi in the system, no?

[bh2k]

flares don't need to be brazed or souldered if you do them right. In the us we are required to recover any refridgerent.

[illmatik]

Wow that's good to know (flaring. knew about recovery laws). So it should make cap tube adjustments much easier to do when tuning these pre made units like vapos. I'm trying to go thru this Tomczyk Refrigeration & AC coursebook and lab guide in between work and mba work in the evening, hoping it shows how to do quality tooling and stuff.

[kayl]

Originally Posted by illmatik

Wow that's good to know (flaring. knew about recovery laws). So it should make cap tube adjustments much easier to do when tuning these pre made units like vapos. I'm trying to go thru this Tomczyk Refrigeration & AC coursebook and lab guide in between work and mba work in the evening, hoping it shows how to do quality tooling and stuff.

yeah when making capillary line changes etc ya have to vacuum again and regas, takes alot of time.
flairs would be about the same amount of effort really. still have to vacuum and apply the appropriate sealant to the thread so it doesn’t leak and tork it correctly.
flairs main use for things like txv etc that dont like to be heated (ie brazed), all other joins i prefer to be brazed.
some ppl have their dd blocks on flairs so can swap, i like them brazed, just another thing to leak if done incorrectly.
propane and co2 releasing into the air isn’t illegal, but other refrigerants should be reclaimed. another advantage to using r290 and co2.
no need to reclaim.

[gkiing]

Originally Posted by kayl

yeah when making capillary line changes etc ya have to vacuum again and regas, takes alot of time.
flairs would be about the same amount of effort really. still have to vacuum and apply the appropriate sealant to the thread so it doesn’t leak and tork it correctly.
flairs main use for things like txv etc that dont like to be heated (ie brazed), all other joins i prefer to be brazed.
some ppl have their dd blocks on flairs so can swap, i like them brazed, just another thing to leak if done incorrectly.
propane and co2 releasing into the air isn’t illegal, but other refrigerants should be reclaimed. another advantage to using r290 and co2.
no need to reclaim.

Yeah, not needing to reclaim gas is a big advantage

You dont need to put sealant on flares if you use a copper gasket, it gets compressed and makes a gas tight connection. Use two wrenches to tighten the flare nut too.