High pressure gas blends

[sdumper]

I know I know google is my friend but Im having a tough time finding a complete refrigerant properties table that has some of the more exotic (really cold) refrigerants.

I haven't played around with r14 for a long time and don't remember if I can mix it with something else to go colder and still maintain the ability to cool modern loaded CPUs.

[n00b 0f l337]

I think you want Coolpack.
http://coolpack.software.informer.com/

[wdrzal]

Search ASHRAE (American Society of Heating, Refrigeration & Air Conditioning Engineers). They assign the R numbers to all refrigerants.

[sdumper]

Thanks Guys!!

[sdumper]

Ok maybe its just me but does methane really require 49.5 (717psi) at -82c to condense into liquid?

[n00b 0f l337]

I see about 650 psi.
-82C for methane is literally the warmest you can get liquid methane at. It's top of the chart.
To appropriately condense r50 you need -110C

[Buckeye]

Title changed per OP's request

[sdumper]

I see about 650 psi.
-82C for methane is literally the warmest you can get liquid methane at. It's top of the chart.
To appropriately condense r50 you need -110C

Adam or MyTekcontrols, any ideas for maximizing the 3rd stage? Right now im just planning on r14 and 600 grams of r600 to help with the flow.

Note: First is adjusted to hold -40c with r507 and second is adjusted to hold between -82c and -74c with r23. Note in the past when I went colder than that with the second I couldn't get my r14 3rd stage pressure high enough to hold load without blending with r1150.


PS: I really wish liquid nitrogen wasn't available to the masses.

[n00b 0f l337]

600 grams of r600a is HUGE. That's almost a full unit charge.
Way less if you need something to carry oil, which you shouldn't if you have the right oil in there.

And yeap on the ln2 sentiment, it's prevalence killed our fantastic hobby.

As to blending the r14.... If you blended with r1150 the pressure would have come down for a given charge, not up.

[sdumper]

Ok I feel dumb What amount of r600 should I be adding?

[n00b 0f l337]

Id start with none and see what the system needs. Just enough r14 should get you going

[sdumper]

Well at least if I dont Ill have a really cool dental bun-son burner ...haha...

[n00b 0f l337]

Try an autocascade! You've got a few years at this now Scott.
The isobutane will still be useful. A small amount, probably closer to 15-20gs can serve as an oil lubricant and help heat extraction from compressor.

What's the freezing point of isobutane?