Following the western world, in India, historically air conditioning (AC) is considered as the best way to provide thermal comfort to occupants. However, the weather conditions in the Indian subcontinent and modern available evaporative air cooling system as alternate have practically been neglected in the process.
Evaporative air cooling (the ubiquitous Evaporative Air Cooler is one instance) is traditionally one of the most fundamental cooling systems known to mankind to achieve thermal comfort. The same concept is used by nature to cool the human body via perspiration. Based on the principle of adiabatic cooling, evaporative air cooling systems make use of water as a natural coolant where water droplets evaporate taking heat either from the air or any surface and in turn cools the air or the surface. If designed and applied properly it can replace conventional air conditioner (AC) in places away from the sea most times of the year. Control climate is measured by human comfort which is provided by active control of temperature, humidity, movement of air and its purity. The evaporative air cooler has the ability to provide most of these at a very affordable cost and operating expenses as it uses few components like a fan, pump and water to do the job. Water trickle down the cooling pad or fills using a pump and the fan draws the dry air across the wet surface to cool it. In fact, the continuous flow of water through the cooling pads acts as a filter and a major part of dirt and dust in the air get filtered there.
