Some suspended/floating covers are used to control evaporation losses from the water surface. Direct evaporation rate measurement is difficult and inaccurate.
From a FULLY COVERED surface they can be no evaporation, other that by diffusion through the cover, which is very small. From and uncovered surface the evaporation is controlled by heat transfer which is hA(T-Twb), where Twb is the wet bulb temperature, h is the heat transfer coefficient, and A is the UNCOVERED AREA. If you are not talking about water, then you have to can't look the wet bulb up on a psycrometric chart, but have to calculate it based on the properties of the material being evaporated. It's been a long time but I think this calculation is call the Lewis problem, or something like that.
Dear,
there is no evaporation from fully covered water surface.
For uncovered area you can get the evaporation by multiplying evaporation rate of the region by the uncovered areas.
Hello . All the details are in this article and I think you can calculate the evaporation rate.
Thank you so much for sharing this very nice study...@amir rezazadeh
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