I found a pressurized liquid nitrogen dewar set-up at my local gas supplier that you might be interested in (50L capacity?). It looks like they use it for freezing totes of live material (shower head on the end of supply), but I see the possibilities for other uses as well.
In terms of CO2… Are you monitoring the pressure within the jacket using a pressure gauge some how, or do you rely on the PRV to vent pressure without watching psi? Are you running a bizzy setup?
CO2 seems cheaper and more efficient than coolers of ice. If anyone has tips on running CO2 on tanks / heat exchangers It would be much appreciated.
