I totally agree.  I also am aware that some radically new ideas have surfaced within the last ten years, that allow really high cycles of concentration with no effect on heat transfer (other than likely improvement over time).  Water leaks really are a problem issue when high cycles are sought, and are a clear mode of failure on any closed loop system of coolant, since make-up rates will exacerbate corrosion issues.

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I totally agree.  I also am aware that some radically new ideas have surfaced within the last ten years, that allow really high cycles of concentration with no effect on heat transfer (other than likely improvement over time).  Water leaks really are a problem issue when high cycles are sought, and are a clear mode of failure on any closed loop system of coolant, since make-up rates will exacerbate corrosion issues.