Im designing a evaporator for an appliance some freinds and i are going to build.
Its a -35c plate used for freezing deserts like cold rock sort of.

Anyway this is the design weve come up with, its a stainless steel folded and sealed to make a vessel with male flare connections attached to the bottom for liquid in and suction out.

Im thinking of running R404a at about 9psi which would meann the plate/vessel temp should be about -35c.

Does this make sense?

Evaporator.jpg