Exhaust fan air coolers work based on the principles of evaporation and air circulation to cool the air. Here is a detailed explanation of their working mechanism:
Air Intake: The device draws in warm air from the room through an intake grille. This air enters the cooler and comes into contact with water-soaked cooling pads.
Evaporative Cooling: The cooling pads are typically made of materials with high water retention and large surface areas, like cellulose or fiberglass. As the warm air passes through these wet pads, water on the surface of the pads evaporates. Evaporation is an endothermic process, meaning it absorbs heat from the surrounding air. This absorption of heat causes the air to cool down.
Air Circulation: An exhaust fan located at the back or side of the cooler then forces the cooled air out into the room. This creates a continuous flow of air, with warm air being drawn in and cooled air being pushed out, thereby circulating and cooling the air in the entire room.
Drainage and Water Supply: The water used for evaporation is stored in a reservoir. A pump in the cooler continuously supplies water to the cooling pads to keep them moist. Excess water that doesn't evaporate is drained back into the reservoir for reuse. Some models also have a water level indicator to ensure proper water supply for efficient cooling.
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