The electricity free air-conditioned unit may look simple. However, it is more effective than most normal units. The idea currently cools a large technology warehouse. The honeycomb shape can cool the warehouse from 50 Celsius to 36 Celsius.
The system consists of Terracotta tubes wetted once or twice a day with recycled water. The tubes absorb the water by cooling the warm air as it passes through. It is also known as eco-cooler.
The air conditioner requires no electricity to function and is created using waste products. It sounds too good to be true, but it exists and is in growing use across the country of its origin: Bangladesh, where 70% or residents live in tin huts without power.
The magic part is actually science as old as civilization itself: Using clay and the evaporation of water to cool things down is an ancient method that has been used in various forms through the ages.
In India and Pakistan, there’s evidence of clay pots used to cool water around 3000 BC, which has continued until today. The installation cost is lower than industrial A/C machinery. The simple design works on the same principle as blowing air out of your mouth. To test this, hold your hand up to your mouth then open your mouth wide and breathe out.