distribution in industrial cooling towers sacrifices valuable energy saving
opportunities. This fact is even more pronounced in today's
water filming style heat transfer medias.
The efficiency of evaporative heat transfer is affected
by the air-to-water contact area and the mass flow liquid-to-gas
ratio. In general, for a given heat load and water mass flow rate,
the more surface area involved, the less required air velocity over
the water surface, and consequently the less air-moving fan horsepower.
If you want lower kW/ton, buy more air-to-water contact surface
Film media, such as the popular PVC cross-fluted corrugated
film block, provided a breakthrough in cooling tower design. It
greatly increases the contact surface area without increasing the
size of the tower box. Adversely, it suffers quickly from scaling
and biomass fouling in very compact air channels that negatively
impact the flow of air.
Precise water treatment is required to prevent bio
growth fouling and the fill must remain “wetted” to
avoid evaporative scaling. Conventional water distribution uses
fixed orifice spray nozzles that produce a round pattern above a
rectangular fill pack. The nozzles are placed in a rectangular overlapping
pattern to assure full wetting of the fill at the design water flow