Tripple digit cascade

bitting toungue...... physically imposible with what you have....

your saying you have 40inches hg vacuum?

Captain,

I want to try about -80 to -100 this weekend on a AMD chip. You got anything rigged up??

BTW: Nice cooler Macci :)

OPP

I think I can come up with something ;) :D

Quote:

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Originally posted by macci
it has some nice vacuum yes ;)
2x21cm3 nominal capacity 778W
heatxhanger hot side at -40C (as seen in the bigger pic)

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What kind of pressures are you running on low stage?Post some pictures of the gauges.I am guessing somewhere around 100psi high side and at least 20" low side.

Quote:

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Originally posted by captaincascade
bitting toungue...... physically imposible with what you have....

your saying you have 40inches hg vacuum?

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im wrong, did some homework. guess its possible?

wont be long now. the next lightning storm ill get the 1.21 jigawhatts i need to start my machine...

sorry im living in the metric world, how do u convert this " 20" vacuum" to bars or pascals etc?? :)

edit: ok google helped me a bit (not much)..
so for instance 23" hq equals to -0.8 bar
..so -1bar is like 29" vacuum??

http://www.paroscientific.com/convtable.htm

Inches of Hg x 3386.388 = Pascal

to hell with u weirdo non-metric ppl!

-105C SST with R23 needs 0.21 bara evap pressure. This is not impossible; my R410A cascade runs at comparable pressures.

To get -105C on the evap unloaded, we would need at most -107C SST, giving us 0.19 bara pressure. Also possible.

Diagram of the system I am running.
http://fugger.netfirms.com/Cascade.jpg

Woohoo, I see an expansion tank :)

Quote:

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Originally posted by MickeyMouse
is the expan. tank to help with high pressure when the setup is off??

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Indeed volume is good, living in the ideal gas world PV = nRT, and since V n and R are fixed in a refrigeration system when ambient T goes up so does P.

Although my question is, on an expansion tank surely you want the inlet to be at the bottom with the tank ontop (think upside down mapp bottle) as to stop it filling up with oil right?

]JR[

1 a lil stupic question. How big tanks should be used in systems like Fugger's ?

Just an educated guess:

Fugger's system was at 650psi static pressure. Now, he used a Danfoss SC12 of which I estimate the internal free gas volume at 2500cc. The oil sep does another 1000cc. And then his piping, which I estimate to be 300cc. Together this adds up to 3800cc. Now, reducing the static pressure to 100 psi and following the ideal gas law requires the total volume to be enlarged to 6.5 * 3800cc, so we need 5.5 * 3800cc = 20900cc = 21L = about 5.5 gallons.

Now, if fugger could reduce high side volume and required liquid before expansion device entrance, the required refrigerant charge would drop fast, and so would expansion tank size.

This really makes me uncertain whether or not I want a more sophisticated expansion device than a captube on my cascade.

Reciever 2.5 in dia x 3 in high, Liquid line is 3/16 in and 4 feet long. And your missing the 2.5 cuft in the condenser. . I have only 14 oz r508 in system...

Whats better than having a tripple digit cascade??

...having two tripple digit cascades of course :D
http://www.solidhardware.com/macci/c..._evap_-100.jpg

The Doom's Day Cooler :D
http://www.solidhardware.com/macci/c...ualcascade.jpg

Holy sh*t! :slobber:
And I thought I was crazy :)

Damn! Someone's making a BIG comeback! :D

What temps are you getting under load....

macci is going to make OPP and FUGGER look like kids playing in the backyard soon Im afraid...lol

macci did you consider making a 3 stage cascade ? Your 2nd cascade with your SC12 compressor as the 3rd stage with i dunno, R14 ?