I've been wanting to build one of these for a while now, finally looked at my scrap heap and decided I had enough garbage lying around to build it Definitely not my cleanest build but I was aiming for 2 things, making it as compact as possible and spending as little as possible on this frankenstein.
1st Stage
Danfoss NF5.5CLX, filled with mineral oil
Refrigerant: R290
Chilly1 Condenser
SUD111 Filter/Dryer
7' of 0.031" capillary tube
Interstage HX: 10 or 14 plate brazed plate HX, just grabbed one
2nd Stage
Embraco EM65HHR (5.5cc/rev), filled with mineral oil
Refrigerant: Currently R290/R744, R290/R1150 in a few days time
VapoLS Condenser
Crude Oil Separator from a 3/4" diameter filter/dryer
7' of 0.031" capillary tube for oil return
8' of 0.031" capillary tube for high-stage gas to evap
SUD111 Filter/Dryer on both capillary lines
1/2 liter in-line expansion chamber
Electrical cut-off, no burst valve, to be installed when charged with R1150.
As it stands I have a feeling I'll be pulling these compressors and dropping in some beefier compressors, maybe FF12HBXs. From what I can tell the oil return is doing it's job but I believe a stronger compressor would yield better results. Decided to go with capillary oil return as I don't like hand-valves and I thought it'd be fun to try. I still need to insulate the part with the aluminum sleeving, just has 1/8" of insulation on it and gets down to -30C or so while running so it's dumping a lot of excess heat into the system.
I don't have any performance numbers right now as I'm nearly out of CO2, used up too much of it brazing the unit together. It's a fun toy but I think that's all it is, doubt it could even hold my QX9650 at idle at any clockspeed When my R1150 cylinder arrives I'm going to charge this thing up with an r290/r1150 blend to try and get it to hold some decent temps/loads but with 5.5cc on both stages and a combined power consumption of 310 watts for just the compressors, I have a feeling I'd be asking too much of the poor thing. It sure was fun to build though Ignore the wiring, just some temporary cables to power everything on, got impatient after working on it for a few days
Bookmarks