Evaporative cooling method, basically used to store for a short duration. Hence all the perishable crops can be stored in this chamber. There should be less variations in regards to the humidity as mentioned by Dr. Nataraj_S_K Sir.
The overall purpose of evaporative cooling is to increase humidity or control humidity particularly under hot environmental conditions. I think, the time for storage can be longer too. Evaporative cooling can be effectively used.