Quote Originally Posted by Unknown_road
Sorry but I don't buy that, partitial pressure doesn't reach anything in the range of -140 with r14. just look at a PT-chart of it.
I need to get some work done but here is a quick bit. These are ROUGH ROUND NUMBERS !! Please don’t beat me up over a small % of error.

Argon works best in the three stage units. (3 seps, 3 CCs)

Two or is this three theories on the argon:

1) Argon lowers the partial pressure of the R-14 in the evaporator allowing it to evaporate at lower temp.
Evap pressure: 25psia (10.3 psig) R-14 Evap temp = -120c.
Add the argon: 50% by pressure.
Evap pressure: 25psia = 12.5 psia R-14 and 12.5 psia argon. Evap temp = -130c. (see your PT chart) More argon = lower temps.

2) Argon dissolves into the liquid R-14 and lowers its evaporating temperature. (i.e. Glycol and water).
3) All of the above.

You guys are keeping me awake at night. CAFFINE !! I need a another Dew