Single stage, dual head, phase change...completely unrealistic or not?

[Hound]

hi, this question is more a question out of curiosity for the moment, as i have no money to do this, but if i got a 1 1/2 hp compressor, and used care50 gas, would it be able to hold a dual head setup, one for cpu, one for GPU, both @ -20?

im also a noob at this if you cant already tell, but, dont flame and help plz

[n00b 0f l337]

Its not impossible. Balance is key though. Chilly1 has abandoned them quite a bit and just uses 2 compressors in one case for his dual evaps. I would use propane frankly since I dont know jack bout care50. You may also want to not get a perfect balance and move more refrigerant to the CPU.

[piotres]

1.5 HP :slobber: ...I don't know anything about that "care50 gas" but if You use even propane, You should get lower than -20*c loaded per head :)

[Hound]

care50 is a mix of ethane and propane

also, shouldnt the balance stay equal as, as soon as there is more refrigerant in one cap tube, the pressure is higher, and the other cap tube is lower...so it goes that way? or doesnt it work like that?

[n00b 0f l337]

Right, I'm gonig to be building a dual evap with a 1/2hp rotary this weekend if I can get the evaps brazed up. :)

[Hound]

cool, post some piccies :D lol

a quick bit of research says that care50 is also called hc22/502 ?? sound more familiar?

more info:
its 95% c3H8 propane
and 5% c2h6 ethane
what does that mean? lol

[hatemi]

2 evaps with the same load shouldnt be that hard. But GPU+CPU system is a tad harder to balance out. -20 on both heads should actualy be rather easy with 1.5hp and care50. But if you want to adjust the temps to what you like and close to eachother you need to get 2 suction preasure regulators/EPRs.

[n00b 0f l337]

The balancing doesnt work the way you described as unequal building of the suction side will lead to lower suction pressures in different evaps.
hc22/502 is more familiar....
Propane and ethane would be a bit colder than straight propane but a bit harder to condense, shouldnt be terrible but I'd use a SLHX just in case.
Ethane a nice gas. Sits between r23 and ethylene but can go down as far as ethylene.

I'll post piccies hopefully, I gotta get these cap in cap evaps built and more copper slab cut.

[Hound]

ok, what are suction regulators and/or EPR's?

also, is a SLHX, basically, a heat exchanger, where it passes the coldness from the stuff coming out of the evap, to the refrigerant going into the condenser?

[fatty]

The duels that I have made don't know 4 or 5 I think I made with nf11's or mach1-2 compressors I have always used the same length cap tube the balance isn't even but the core will still hit -20 under load and gpu well here is a pic for ya

http://gallery.greatestjournal.com/albums/up5/462/929462/-44.jpg

[Hound]

dear god, with 1.5hp that is definitly possible, even without much tweaking... cool, must save up pennies now.

what video card is that?

[fatty]

It was either an x800pro vivo or an x850xt pe it was a while ago so?? cant remember

[Hound]

so, what is a SLHX?

is it basically a heat exchanger, or something more complex?

also, pressure regulators, or EPR's, whatever they were called again, do these act like a automatic capillary tube, that lets in some refrigerant one second, and more another, and less another, or do you have to tweak it?

[hatemi]

so, what is a SLHX?

is it basically a heat exchanger, or something more complex?

also, pressure regulators, or EPR's, whatever they were called again, do these act like a automatic capillary tube, that lets in some refrigerant one second, and more another, and less another, or do you have to tweak it?


SLHX is suctionline heat exchanger.

EPRs or what ever you call them are used to control the suctionside preasure that reflects to the evap temp. Think of them like some sort of choke on the suction line that you can adjust to achieve the desired preasure/ evap temp. If you use 2 of those you can pretty much adjust both evaps to what ever temp you want them to be at.