Zero energy cool chamber operates on the principles of

Answer: Option D

Zero energy cool chamber operates on the principles of Evaporative cooling.
Zero energy cool chamber is an on-farm rural-oriented storage structure that operates on the principle of evaporative cooling was developed at IARI, New Delhi, using locally available raw materials such as bricks, sand, bamboo, dry grass, jute cloth, etc.
The evaporation of water can create a cooling effect. The chamber is an above-ground double-walled structure made up of bricks. The cavity of the double wall is filled with riverbed sand.