Immersion chiller water inlet

[BuzzCraft]

What's the conventional wisdom regarding plumbing an immersion chiller? Should the cold water enter the top of the coil or the bottom?

It seems to me it would be more efficient to have the cold water come in the top and exit the bottom, but wonder what others think (or know).

Thanks.

 

[CodeRage]

It doesn't really matter on an IC. whirlpooling will have a far greater impact than the direction of coolant flow.