Hey it seems like things were getting a bit dead around here so I thought I'd try an liven it up a bit. And yes I'm back on the CryoBUG project, only this time with a new twist.
So what's up?
I stumbled upon an old patent by Andrija Fuderer. Actually I rediscovered it with new eyes, because over the years I've glanced at it more than once, but never really saw it for what it was. And believe me when I say it is a jewel. The patent was issued in 1965, and describes what at first glance appears to be a basic single stage autocascade. However upon closer inspection, it can be seen that there is much more to it. In his primary design, there are a series of sub-cooling stages being used in combination with what I call the Auxiliary and Cascade Condensers. He also goes on to discuss the possibility of utilizing something similar to a fractionating column for phase separation. But the real beauty of what he proposed was basically the idea of keeping it simple, using only a few refrigerants (as little as two) and intentionally picking out refrigerants with as much as 100C difference in boiling points.
Anyway I looked at what he had done, and created my own streamlined version as can be seen in the image below. For much more detailed information on what I am doing please visit my blog (Yep I finally got my site back up and operational). We can also keep the discussion going here as well.
Best news is that today I came pretty close to matching Fuderer's results on my first test. Nearly -110C with only R-134a and R-14.