So here's some autocad!
Estimated Temperature: -110C to -150C
Got home today, gotta start unpacking a huge amount of stuff from school. But, ran down stairs, and threw some crap on the table.
Hope you enjoy.
Some fairly sloppy grinding and heavy red krylon paint later,
A milling machine! Richard got it into the workshop on this dolley of his. I was scared watching this thing jump up and down with each step. (Had to underinflate the tires on the dolley to take 300lbs safely)
(And not that loud
Welding up a new work table, mainly for the project, but also for the milling machine.
Then we can start plotting the cage
Table 1 done. Milling machine going on up tomorrow.
Winch + ceiling beam = Mill on Table!
I'm happy it made it, table seems more then okay, but conducts vibration a bit much.
Going to get some more MDF under it, get it all bolted down. And then figure out why the spindle ain't spinnin!
Everything moved over, so time to start laying out parts.
Might have a lead on the condenser I'd like for this, so the front is a little empty.
Compressors that seem "used" are working pulls from my own personal cascade that well, I built and never got around to finishing. So they're brand new still.
Brazed the first suction stem on compressor numero uno. It's nice to do them like this, since they'll shoot straight up to the heat exchanger coils. Nice and easy to insulate.
Heat exchanger time.
You can never have enough copper.
Making some fitting attachments.
Cleaned and shined;
Let me explain this picture a bit.
It's fairly hard to shove one tube inside another tube. It's especially hard as the lengths required get long and longer. When making a heat exchanger using 3/16 and 3/8" tube, it becomes an exercise in insanity.
Both tubes must be nearly perfectly straight.
That means, even the tinyiest imperfections become a problem. As you begin to push one through, friction becomes a huge problem. Even a degree or two at a tiny spot pushes parts of the tube against the inside of the other tube.
This isn't a problem with performance, simply that it becomes impossible to push one tube in any farther. You must then withdraw it, figure out what's stopping you, touch it a tiny little bit, and try again.
My method involves 5 ft long steel beams and clamps.
Clamp the tubes straight as possible.
When your looking down a 20ft long barrel though, things get interesting.
This took 3 days.
And bent on up.
20" by 12". 4 loops or so tall.
Should be adequate heat exchange. And nice and easy to insulate, I hope.
Second heat exchanger rolled, CPEV's tested played. Nice and up front. They will be "separately" insulated in their own little sealed box.
Now thats sexy. And under 3 inches tall.
Those CPEV's are looking beastley aren't they?
I think I went a bit overboard height wise. Don't need that much! (Yay the cascade just got shorter!) I think I'll shave 2 inches off of her. Having the "low" HX in the center helps with the insulation of it. Normally -80 to -90C would require 3" of foam.
5 of 6 gauge kits.
2 ft of 1/8" tube on each, after brazing in an inch and a half of 1/4" tube to a tube adapator.
Will find that last bit or just pickup another while I'm at homedepot getting JB Weld for these joints. I don't like teflon tape, it's just not robust enough for me.