I'm interested in low temp refrigeration and I'm playing around with r410a. I have an old micro fridge compressor that ran on r134 and I've built a test bench that runs on R410a with a small EEV that I am manually cycling. I know both systems use POE oil so everything should be fine on that side of things. My concern is pressure.
I kept the high side tubing as short and small as possible to minimise volume, and the low side as large as possible, with a liquid reservoir as my evap. My thought is that if I undercharge it, meaning, no liquid anywhere in the system when powered off, when I fire it up, the pressure in the high side can condense just enough to keep liquid on the eev and deposit a small amount into the evap. The low side can run in a vacuum, so oversizing that tubing will give me extra storage volume when it is off. I think everything is working correctly there, but I plan on adding a sight glass right before the eev to verify. Sometimes when I start up, I don't get liquid at the eev and it never builds enough to condense. I'm thinking a little more static charge should help.
Does anyone know what kind of pressure and temp a refrig compressor can handle? I figure as long as I don't exceed either it should work.
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