Autocascade build to understand a closed book
I've read a lot on mixed refrigerant cylce and decided to get my own experience with it. First I start building a Linde-Hampson-Cycle with only one Refrigerant. Bit I didn't finish it. One refrigerant because I didn't want to waste expensive gases for no results :D
After I saw the load test result of myteks CryoBug I thought I can give it a chance.
So I thought about different designs but end up with myteks CryoBug because less phase sep reduces cool-down time and decrease high pressure. I installed a buffer volume to get more room for experimentation.
Final charge should be R600a, R1150, R50, R740
The specs:
compressor: 21ccm R407C Samsung rotary compressor
air condenser: ECO 1,2kW, 230mm fan
cap tube: 1,0mm 1,5m each phase sep and subcooler HX
HX stack 12x1mm outer , 6x1mm inner
aux HX: 5m
cascade HX: 6m
subcooler HX: 3m
hotgas HX: 10x1mm/6x1mm
phase sep / oil sep: 35x1mm 25cm
buffer volume: 8l Klimal
Picture of the Design:
http://www.extremecooling.de/forum/a...8&d=1393600731
I charged the unit with R290 and R1150 for the first testrun, 100g each.
The temps and pressures I get:
http://www.extremecooling.de/forum/a...8&d=1395508897
First I start with filling the 100g R1150 and then I start the unit while filling 100g R290. So I should have the whole expansion tank filled with only R1150 that is not in the cylce so far. I think after a restart the gases will be better mixed and I hope for some degres colder.
The question is which gas should i fill now? The Aux HX and suction line is much too warm and evap could get a bit colder with that charge :D
Now here are some pictures for a better understanding:
Evap design with cap in cap:
http://www.extremecooling.de/forum/a...2&d=1393601435
http://www.extremecooling.de/forum/a...5&d=1393601462
http://www.extremecooling.de/forum/a...6&d=1393601462
http://www.extremecooling.de/forum/a...6&d=1393804605
Phase sep and oil sep:
http://www.extremecooling.de/forum/a...9&d=1393685439
HX stack after bending around a 10l refrigerant bottle:
http://www.extremecooling.de/forum/a...0&d=1393601435
HX stack while brazing:
http://www.extremecooling.de/forum/a...4&d=1393601462
http://www.extremecooling.de/forum/a...0&d=1393717080
http://www.extremecooling.de/forum/a...1&d=1393717080
HX housing, manometers, mgv and pressure switches:
http://www.extremecooling.de/forum/a...3&d=1393601462
http://www.extremecooling.de/forum/a...9&d=1393601435
Finished unit:
http://www.extremecooling.de/forum/a...8&d=1393804605
http://www.extremecooling.de/forum/a...7&d=1393804605
http://www.extremecooling.de/forum/a...5&d=1393804605
http://www.extremecooling.de/forum/a...4&d=1393804605
http://www.extremecooling.de/forum/a...3&d=1393804605
http://www.extremecooling.de/forum/a...9&d=1393804649
http://www.extremecooling.de/forum/a...0&d=1393804649
http://www.extremecooling.de/forum/a...1&d=1393804649
http://www.extremecooling.de/forum/a...2&d=1393804649
http://www.extremecooling.de/forum/a...3&d=1393804649