... stream and transfer it to the secondary air in the evaporative cooling process They can be made either of metal or plastic and must easily conduct heat, maintain the two streams separated and ... such a way that it can behave either as a direct evaporative cooler If outside air is dry, taking advantage of its evaporative cooling capacity; or as an indirect system if outside air is humid and ... air in summer, mainly in hot and dry climates, the process of evaporative or adiabatic cooling appears as an alternative There are many systems that can operate as direct, indirect or mixed evaporative...