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funkybrown
24-09-2007, 10:29 PM
Hi all, i'm new to these forums, and i hope some of you are able to help answer some questions i have...

I have made a couple of R134a systems, all using 1/8hp - average compressors, however, i now want to go a lot further!!

I am aiming for the magical 'optimum' running temperature of -178C (or near to)

some potential gasses..

Gas Boiling point
R-14 (-150C @ 350psi)
R-50 (-162C @ 450psi)
R-740 (-120C @ 300psi) argon

However, i haven't a clue where to start off, by finding a compressor capable of handling these temperatures and pressures without forking out thousands of pounds on a cryogenic system
can anyone please help?
James

The MG Pony
25-09-2007, 12:18 AM
No offence but clearly you have no idea about what you want to play with. Keep learning and you'll get there.

Now a more direct answere is there are non you either fork out the cash or learn how to make cascades and there is a ton you'll need to learn to do that safely and reliably.

Bones74
24-10-2007, 10:47 PM
I would say it would almost impossible to get that. Why? because you are in liquid nitrogen territory. If someone made a "reliable" system then they would already have it out. These compressors are custom made with oil loops and extended discharge piping in the compressors. Not a stock item. Good luck to you!

Pooh
24-10-2007, 11:08 PM
Your talking very dangerous territory here, the pressures you are talking about are way beyond standard refrigeration kit and should you try it you waould have a big hole were the plant used to be if anything went wrong.
What are you trying to cool?

Ian

vwxy950
09-03-2009, 11:10 AM
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alpha
12-03-2009, 10:59 PM
Hi, -178C, thats bloody cold lol.
I have seen a few cascade systems reach -130 on four stages for pc chips and that was using normal hermetic compressor, I think reaching the temperature you desire is going to cost you big $$$$$ money. Good luck :]

Toosh
13-03-2009, 12:26 AM
Handbags have been a good accessory in completing women's outfit. There are a wide variety of handbags that come in different styles, designs, materials, colors and sizes. These accessories have great significance because of their versatility features. Both men and women carry bags, however, it is just well-known that women use them more than men. Furthermore, handbags are also use to create a fashion statement. Different designs and styles are born each year. Celebrities and popular TV icons are often the first to try trendy handbags to complete their looks.Different variety of handbags were basically designed for different purposes. And to make it widely available to everyone, such fashion accessories are now available in different variety of designs, styles and colors to incorporate with different wardrobes. This is the reason why almost all women have 3-5 different types of handbags in their closet:off topic:

What the hell has this got to do with the price fish

Norm

LRAC
13-03-2009, 06:50 PM
:off topic:

What the hell has this got to do with the price fish

Norm

Handbags, now fish i suppose the handbags might withstand -178 C until you touched it and fish is very expensive at the minute?

havertyp
08-05-2009, 12:08 AM
I work on factory built autocascades for the semiconductor industry, I have been to the plant in Sharon, Boston USA where they are built, the cascade plumbing assembly is an extremely complex affair, made by a specialist copper tube fabrication house, the compressors used were the Danfoss LTZ/NTZ series and the gases used are typically R134a, R14, R336fa. These older systems achieve typically -70C and are critical charge systems. The company have been working hard on a -95C autocascade using a scroll compressor, and it has been in production only for the last 2 years, I have met some of the top refrigeration design engineers there and they feel that they are pushing things to the limit a bit, tryint to keep ahead of the competition. My point is, that if a major player in autocascades is having to put so much time/expense into getting these low temperatures, then it is beyond the reach of the everyday guy to build such extreme systems safely.

jim01
16-07-2010, 09:59 AM
thanks for your post i am looking for that