Photograph courtesy of the Marathon Area Swim Association

Photograph courtesy of the Marathon Area Swim Association

Simplified Method of Calculating Evaporation From Swimming Pools

Introducing tables intended to make highly accurate formulas easier to use

Accurate calculation of evaporation from swimming pools is needed for proper sizing of ventilation and dehumidification equipment. Calculations are needed for both occupied and unoccupied conditions for proper modulation of equipment capacity, as well as estimation of energy consumption. The most common method is the one recommended in ASHRAE Handbook—HVAC Applications.1 It involves calculation of evaporation using the Carrier equation2 and correction of the output

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