Thanks for your replies!
Well, let me first tell you about the cascade that will be chilling the transfer fluid.
The final goal is the design of an autocascade. Probably running a mixture of propylene and ethylene.
The company I am working with at the moment is in the progress to get the cascade ready. However, first step before the autocascade is a traditional cascade. This is simply a step to gather experience before "going all out".
The temperatures are not "really" the issue anymore. I can design a cascade that will handle -100°C under full load (approx. 300Watts) - Viscosity of the transfer fluid is the much bigger problem.
I suppose that I will not be able to go much lower than around -90°C - However ... the cascade should handle this temperature at full load!
Since the cascade is not available for testing yet, I decided to do a test run using dry-ice, over a time period of approx. 2 weeks.
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