Fantastic work.

Just a couple of questions:

Firstly how does the efficiency of this autocascade compare to a well build standard cascade, at the same loading / temperature tuning ? (Heat moved Vs Compressor power.)

Secondly, looking at a chart the boiling point for R-600 is -0.4C. Sorry if I've missed this but it's a long thread with a lot of detail - How does this help the autocascade ? Would R-600a not be better, seems as it has the same molecular mass yet has a boiling point of -11.8C ?

-Andrew.