Mixed Crossflow Evaporative FluidCooler is used to Cool the hot water or other Fluid .Water or fluid is re-circulated in the unit, moving across the coil with coolant. A fan forces fresh air up through the coil. The process transfers heat from the coolant to the circulating water where it is rejected into the space through evaporation.
Evaporative Fluid coolers eliminate the need for a heat exchanger between the process loop and the heat rejection equipment. Unlike a cooling tower, where process water is used as the energy transfer medium and is open to the atmosphere, the coil inside a closed-circuit cooler isolates the process fluid.
In a closed circuit cooler, process fluid is circulated through coils within the unit. A water distribution system cascades water over the tubes of the coil, extracting heat from the process loop via evaporation. Air is drawn or forced across the coils, agitating the falling water and increasing the transfer of heat. A small amount of this water evaporates due to latent heat transfer through the tube and fin walls of the coil, removing heat from the system. The cooled process fluid returns to the building via the bottom coil connection. Cascaded water drains to a basin and is recirculated back over the coil.

These coolers provide energy-efficient operation in a reduced footprint compared to dry coolers, due to evaporation being used as the primary method of cooling. Because blowdown of the basin water is reduced on closed-loop systems, water conservation is also improved when compared to open-loop systems. Because evaporative coolers can oftentimes run dry when ambient conditions are favorable during reduced load conditions, water consumption is eliminated entirely during these periods of operation.