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 Indian subcontinent and modern available evaporative cooling technologies as alternate have practically been neglected in the process.
Evaporative air-cooling (the ubiquitous 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 human body via perspiration. Based on the principle of adiabatic cooling, evaporative 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 sea for 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 cooler has ability to provide most of these at a very affordable cost and operating expenses as it uses few components like 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 major part of dirt and dust in the air get filtered there.
