Dear Karen et al,
As I think more about this, several things come to mind:
· It’s a simple matter to calculate the amount of energy lost by evaporation; pool heater people have needed that information for a long time. It does not matter (to them) whether the energy for evaporation is taken from the air or water; they just need to replace it.
· For the purposes of pool water heating energy calculations, it doesn’t matter where the energy goes either; the pool water heater must replace it.
· I reached out to a colleague who is the Engineering Manager for one of the major pool dehumidification (air handler) companies to clarify this, since I did actually keep falling asleep in Thermodynamics class. He says that essentially all of the heat of vaporization is removed from the pool’s water if the pool and surrounding air are the same temperature. (EngineeringToolBox.com says much the same, but my friend explained it better.)
· For an unheated pool, the evaporation would cool the pool’s water and create some sensible temperature exchange between the pool
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