Morphing Air Conditioner into Autocascade System

[mytekcontrols]

are there any gas mixture rules of advice and/or any captube flow rate procedures you would take with single stage designs?

I'll have to defer this to some of the other people on this forum, who have much more experience with single stage systems.

What about a mix of R-600/R-290/R-1150 or R-600/R-507a/R-1150? That would be closest to the "50°C-Rule"...

This is referring to:

The best initial approach I can suggest (and could perhaps be considered a rule of thumb), is to try to pick refrigerants with a difference in boiling points of approximately 50C (+/- 10C). Of course an autocascade will work even if these conditions are not adhered to, but the idea is that this should give you the best initial results. The rest comes down to intuition based upon a lot of experimentation (or should we say a "gut" feeling). Some people also call it black magic.

Which was from Project Whop Post #139 it was my mistake to call this a "rule of thumb", which has been reinterpreted into a "Rule". In the future I will have to be more careful how I word things.

What I really meant to say, was that this is a good "Starting Point", but unfortunately bunged it up by adding the additional qualifier of : "and could perhaps be considered a rule of thumb". Sorry guys

Anyway moving on with my tail between my legs, what has been observed in the past, is that refrigerants with widely different boiling points can still have great success at working together in an autocascade. I talked about this earlier in Post #8 where I discuss the possibility of using only R123 and R23 to build a -80C system (a CFC version of this would be R11 and R13). Below is a schematic of how little is needed to make such a charge work (single-stage autocascade --- as simple as it gets).