Evaporative cooling the answer of tomorrow and always will be?

摘要

EVAPORATIVE cooling operates on the simple principle of a fan drawing warm air through a wet pad. The warm air is cooled by evaporating water which changes sensible heat in the air to latent heat in the vapourised moisture thus causing a temperature drop so the air is now at a lower temperature and higher relative humidity but the same enthalpy, as the initial air. Instead of a fan the natural breezes can be used but this means a more irregular airflow and hence cooling.