The TOPAZ adiabatic cooler is a combination of dry cooler with an adiabatic precooling section: this precooling section lowers ambient air temperature by evaporating water which is passed over the cooling / humidifying pads, specially designed for this purpose. The fluid is cooled in the dry tube coil by ambient air flow. The ambient air is drawn through the coils by fans mounted centrally on the top of the cooler; the humidifying pads are located in front of the coils.