What makes a good Evaporator?

[Smurfy]

When designing an evaporator what’s important?
Are you trying to trap any liquid refrigerant so that it boils off?
If yes does that mean you actually want a fairly rough restrictive path?
Or do you infact want a nicely machined smooth route for the refrigerant to travel through?

The maze design seems popular, is that because its fairly easy to make with a pillar drill?

Any help would be great.

[JSU]

When designing a block you want a straight through path with the most amount of surface area possible. (AKA chilly1 evap)

[chilly1]

You need to balance the surface area with the cross sectional area so that it will conduct heat away from the processor as quickly as possiable. A surface with micro channels or micro pits will increase the surface area. The suction line sice and outlet of the evaporator should be the same cross sectional area as the chamber in the evaporator, A restriction here will lesson the refrigerant flow from the block. For Flooded designs or designs where there will be a substiantial amount of liquid in teh block you need to consider the positioning so that the liquid refrigerant touches as large a surface area as possiable and still not flood bact to teh compressor or accumulator. And you must fit all this in a package sized to fit on the die be able to sucsuessfully insulate it and still be able to mount it an dmake contact with the processor.