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Unless something is out of calibration with your temperature measurements, it doesn't appear that you got cold enough to freeze any of the refrigerants in use, and if it were oil, it would probably...

Mike Elam and I made a connection, and I will be helping him and his team on this project. Unfortunately I am now under an NDA so I don't know how much if anything more can be posted about the...

Patrick congratulations :up:

Truly impressive results!!!

And welcome to the -150 C club, you have certainly earned it.

When I get a chance maybe later this week, I'll study your data in...

Your welcome :)

I figured everyone would get a kick seeing the insides of this little baby compressor.

Yeah that sounds about right to me as well. The manufacturer claims about 400 watts for use as a water cooler. which would be a 40F (5C) application.

I have an AutoC system based on a similar...

Yep it's normally intended to run with R134a refrigerant, and can be used for a mini fridge for mobile uses (much more efficient than those Peltier thermoelectric types). It also sees use for...

Yep I had it brazed, charged, and running, although that last part only for a few minutes. The compressor is still good, it was one of the windings on the stator that opened up. My fault kind of, I...

I thought you guys might find this interesting.

I decided to dissect my poor little Aspen compressor that had opened up a motor winding. It was of no use to me in this condition, so I figured why...

:sofa: Hi Patrick, anything new to report?

Hi Patrick,

The cap tubes were way too long (very restrictive).

Compression ratio was way high.

Cooling was not an issue, since the compressor wasn't running very long before it ceased to...

BUMP BUMP :poke:

How's it going Patrick? Any more test results?

Here's a little more inspiration for you :)
...

It's steel, so you'll have to use silver solder and flux (I'm talking about real silver solder, not that cheap :banana: silver bearing solder).
...

I also purchased one of their Dental Burners and converted it into a tap by removing the burner head and silver soldering in a 1/4" brass male flare fitting. But what Crabby is suggesting will...

Hi Scott, here is where I get it now: IQ Dental

Keep in mind that there is a HazMat fee involved (I think this was $20) so buying in quantity is probably best to offset this. I usually buy 6 cans...

I'm glad you still had a copy of that :clap:

A 21 CC rotary compressor will probably need approximately 150 grams of R600a. This is just an intuitive guess, but it should get you close. Let me...

Looks like we lost a couple of posts :confused:

I can't give away all my secrets, but Patrick had it right when he said R600a (isobutane), R1150 (ethylene), R50 (methane), R740 (argon). I would start with 40 grams of R600a, and then go heavy on...

Patrick it is a thing of beauty :up:

Glad to see others picking up the AutoC designs and running with it. Great idea on adding the liquid line HX to heat up the phase separator gas stream when...

Adam, are those from Duda or did you find a better source?

Probably feels good having all those ready for what ever strikes your fancy. I remember years ago (pre PC era) I came across a couple of...

I concur :up:
And that checker sleeving is a thing of beauty.

Actually what you just described is a standard part of most all of the Polycold units, and is also something I implemented near the end of the AC2 project. We call it an 'active' sub-cooler for lack...

That's an interesting idea at the end point, dividing the condensate to feed back on the final cascade. Never tried something exactly like that, although I have done this with a sub-cooler HX to...

Hi Britt,
Yeah I'm pretty much the same as you with having time for the hobbies, although in my case the kids just bought their own house late last year (I think I'm a bit older than you).

I wish...

Thanks, and I think that'll be a great help to anyone trying to reference this thread.

So do you know what exactly happened? Was it due to bandpass or storage considerations that caused the...

Hi Ultralo,

Now I'm good with handles, but horrible with remembering names. Would Brent be correct? It's been a long time, and my mind has gotten a little mushy.

Yeah things are chugging along,...