Quote Originally Posted by cryo-tek
Hi Cold Ice, You want -160, is that C or F ?

Check out the Temprites at : http://www.temprite.com/main_catalog...y=288&item=965

Think out side the box... something like a mix in the R14 stage and a second separator after an added auxiliary condenser to trap the oil and the added high boiler. The oil will need to be miscible with the high boiler. Zerol would be a good choice for the oil. A cap tube could be used to control the feed of the high boiler back into the suction upstream of the auxiliary condenser. You could get some good suction cooling for the compressor and some precooling of the R-14 This would be sort of a hybrid of a cascade and an auto cascade. The high boiler, I'm not sure but my first thought is R-22. I need to think about what it might do when mixed with the R-14.

Another thought, R-14 will give you -120c with a 10 psi evap pressure. Try adding some argon to the R-14. This should lower the temp. but drive up the discharge pressure and temp. The added suction cooling provided by the high boiler will help overcome this.

Sounds wacked? I have systems that will do -170c with low loads. -135c with 2500 watts of heat load. Yes these are auto cascades.

Stay cool,
Wow, looks like a phase change god has just entered the forums...
wlcome to xs!

EDIT: and what kind of autocascade do you have running with temps @-135C on a 2500Watt load??? What size compressor?