Air coolers work on the priciple of cooling by the evaporation of water which is present in them. These coolers are also called desert coolers or swamp coolers and they require water, which is filled in these coolers. The cooling effect is produced due to the transition in phase from liquid state to vapour state.
Various parts that are needed to make an evaporative cooler or a simple air cooler are:
1)Fan and vents- A fan is needed to direct the cool air towards the room. These fans continuously flow cool air in the rooms.
2)Water source- Evaporative cooler uses water so it is necessary to fill the cooler with water so that the cooling can take place.
3)Cooling pads- The purpose of cooling pads is to absorb water and to pass air through them.
4)Distributor- Water needs to be distributed properly to these cooling pads. This is done by cooling pumps and various pipes that interconnect the cooling pads. These cooling pads should aways be in saturated state otherwise the water will evaporate away from these pads.