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It works as a simple heat exchanger. The energy from the fan causes the warm air to go through the towel. This air water interface causes the water to evaporate, this evaporation causes the temperature of the water on the towl to decrease and thus cool the air. Air on the down wind side will be cooler as energy was removed though evaporation of the water, energy meaning heat.
It works as a simple heat exchanger. The energy from the fan causes the warm air to go through the towel. This air water interface causes the water to evaporate, this evaporation causes the temperature of the water on the towl to decrease and thus cool the air. Air on the down wind side will be cooler as energy was removed though evaporation of the water, energy meaning heat.