In Cooling towers these act as Lungs of the CT. Water is cooled in & by the Fills. Wrong or Improper selection of media can spoil an otherwise perfect design.
The fill is available in various Materials like Treated Timber , PVC / Polypropylene, ABS, FRP & Even RCC.
Selection depends on variety of factor. Each fill has its own L/G value.
In a Cooling tower, water is cooled by:-
Splash Cooling or Film Cooling or A Mixture of Both Splash & Film Cooling,