L337 M33P said:
first stage gas is bbq propane and second stage is co2.
Ven0m said:
It looks really cool, pretty similar to berkut's autocascade.
Can you describe how it works?
and -72*C
ok you have a mix of c02 and bbz propane(r290) that leaves the compressor discharge and goes to the condenser. then this enters a phase separator (map gas bottle) liquid r290 at room temp condenses into liquid r290 along with the oil at the bottom of thephase sep and exits the bottom and then travels to the hx where it evaporates and cools the hx to -32c. this then travels back to compressor.
back to the phase separator. now co2 at room temp can’t condense into a liquid at this pressure/ temperature, so it travels out the top of the phase separator. this then travels to the hx where is is cooled and can condense into a liquid and travel to the dd evap and evaporate to cool the dd evap to -72.2c.
the c02 then returns via the suction line back through the hx to help cool the hx some more, (the suction line temp is -47c before a suction line hx was added, so this cold is taken advantage of to help cool the hx, without the suction line hx is difficult for the hx to pull temps down to even 0c, once It goes below 0c temps fall a lot quicker in the hx.
Without the suction line hx all the r290 gas goes to the dd evap instead of the hx and it has trouble getting cold.
to the compressor and the cycles repeats over and over.
Yes my autocascade is similar to berkuts, but I did 3 revisions trying different ideas, from my findings I think this is best way to build autocasccade which so happens to like berkuts, but I have research and know why it needs to be done this way., I may incorporate some of the ideas into my cascade.