Giving a charge to evaporative coolers

The new design places an electrical gradient across the input side of the cooler. Water in the incoming air (assumed to be 90°F and 85% relative humidity) is charged, and charged air ions are attracted to a grounded screen or an array of electrified needles. Ions collect, drops form and they fall into a collector. Relatively dry air (24% RH) is then drawn through a wet porous medium, dropping the air's temperature by 25°F and raising humidity to 35%. Not only does the system improve the cooling capabilities, it also destroys bacteria and removes dust from the air.