How does a water cooler work?

I am doing a research project on water coolers and before I can state how to improve the efficiency of water coolers I need to show that I understand the science and engineering principles behind the whole process. Even though I've spent many hours looking through books and journal articles I cannot find a... show more I am doing a research project on water coolers and before I can state how to improve the efficiency of water coolers I need to show that I understand the science and engineering principles behind the whole process. Even though I've spent many hours looking through books and journal articles I cannot find a source that explains the technical side well enough for a first-year mechanical engineering student to understand. Help!
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