I've been working slowly away at the dual evap rotary project for someone from O-CuK forums, and thought I'd post pics of how it's coming along
I've been slowed down on my work lately, but I've developed some severe Carpal Tunnel in my wrists and it's agony just to type at the moment. Hopefully the British Medical system helps me out with that soon
but for now it just makes the work go a little slower. Losing feeling in 4 out of 5 fingers on each hand sure makes it hard to 'feel' what you're doing
Anyways, the controller will be coming from Ssilencer and Golden Eagle when the K-probe system is ready for the 'X' based controllers and will have all of the needed safeties and such.
The spec currently on it...
3/4HP Carrier Mitsubishi Electric rotary compressor
2 previous revision
Chilly1 heads
3m of .031" captube per head
Common suction and short flexi per head
6 row condensor
90cfm condensor fan
65cfm exhaust fans x 2
Custom
Dimas 'Tall Boy' case
Full 'R-Blox' (tm) sound insulation
Gas currrently for testing has been 404a, but will very likely be 402a in the final step.
The wiring is just there for testing
that will all be redone to my satisfaction later on as well.
The older Chilly heads were used for a reason. The capacitor clearance...well every bit of clearance is incredibly tight on this motherboard, so the extra couple of mm you get makes all the difference in ensuring the mount is good.
The line is a full 1/2" bore flex, but there's a 2.5" per head short flexi line to the solid tubing that goes into the flexi to the compressor. That is just enough to allow the heads to very easily flex into position when mounting.
That lineset was a real challenge to make, not just for the intricacies of a common suction, but getting the dimensions 'just right' was harder than it looks
Wish I'd gotten pre-insulation pics, but I may be stripping it down fully when I redo it for it's final setup and if I do, will get pics of the 'naked' line then.
Sound insulation. Rotaries are notoriously loud, but this will ensure reasonable noise levels. Only a 'boot' for the suction line to keep the noise from getting out of the top hole, and a 'baffle plate' for the rear to allow airflow, but very little noise, is still being made.
The backplates I'm using for testing with 150w load resistors. The system will have a full single backplate for the install, only the heads will remain independant for best contact.
you know what 'big hands' means
The intended 'victim'
Edit, just a quick 'frosty' shot
That motherboard will have a couple of self adhesive 'seal pads' made for it, and the foam rings made from slightly smaller, and shorter foam and the insulation from the board will 'reach up' to the rings. That's mainly due to the capacitor clearance. I've got loads of self adhesive 6mm neoprene, and will do a couple of extra pads for him if he needed to replace the mobo later or anything like that
And that's about it for now.
I didn't get pics of the temp and load testing out in the shed, but that can wait for now. It's a little cramped in my little shed with all the work lately
Temps are currently about -65 idle and -44 load per head. The balance is amazing and I'd recommend a common suction to anyone for better balance on dual head if it's at all possible as I think that's really helping. With 402a and a little more playing with it, I'm pretty sure that -50 per head shoudl be about right.
I don't like the configuration of the filter, I tried that to get a strong liquid backpressure going but it's a little more than I was after and it's easy enough to play on that part of it. The insulation and heatshrink will be redone nicer later on, was just having a play to see how difficult it would be to 'pretty that up' a little
My wife won't let me do any temp or load testing in the house until the sound insulation is done though
doesn't like my 'noise'. Silly woman
So yeah, will update this post with more later on as I get more done, and the controller arrives
Cheers
Gray
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