Determination of Mass Transfer Coefficient for Evaporation Water from surface of Swimming Pool and Amount of water loss per Day

The calculation of evaporation is required from a variety of water pools including swimming pools, water storage tanks and vessels, spent fuel pools in nuclear power plants, etc. In reality, evaporation is a very complex process that is difficult to estimate using equations. This is because the rate of evaporation is actually controlled by many factors including, temperature, air pressure, wind speed, and humidity. Several equations exist that can be used to predict evaporation. The purpose of this brief paper is to describe some principles involved in estimating evaporation with example data from large and small water bodies. Particular emphasis will be on practical procedures and techniques that professionals can use to estimate evaporation from shallow water bodies using pan evaporation and a combination equation using available weather data and/or new data collected specifically for estimating daily evaporation.