Coolant is a passive cooling system for buildings developed by the New Delhi architect Monish Siripurapu. The name is not just a turn of the refrigerant; Siripurapu was inspired by pleasant Anhills who have been passively cooled. The air circulates through the tunnel and ventilation slots of an anthill and reaches sludge loaded with moisture. Hot air escapes through the upper ventilation slots, and the air behind it is cooler thanks to the mud.
Since it is not practical to bring sludge into jobs and houses, Siripurapu uses Terracotta instead. Matrices of terracotta tiles or tubes are built as facades or screens placed in front of windows.
These matrices are equipped with sensors, and when the temperature rises, a pump connected to a nearby tank drips onto the terracotta.
When the heat meets the moist terracotta, the water evaporates. This process essentially takes up a piece of warmth and reduces the amount that reaches the occupants of the building. The not evaporated water is collected on the bottom of the facade and moved into the system.
The terracotta also offers shadows and promotes the air flow with rooms in between.
Since the Terracotta objects do not have to have a specific form, this enables a good measure of aesthetic flexibility.
Here is Siripurapu that explains the system:
https://www.youtube.com/watch?v=ywvwyfyoqrmEnter a caption (optional)