The spray-evaporative process is a magnet for all sorts of airborne debris and particulates. Items as large as leaves and as small as microorganisms can find their way into the tower system, jeopardizing the expensive, critical equipment being cooled. Water treatment and blowdown can help with the biological fouling and dissolved solids, but a filtration system is essential for reliable and economic operation.
One such filter employs a simple cleaning principle based on the scientific research performed by Swiss scientist Daniel Bernoulli in the 18th century. As the law of conservation of energy states, energy is neither created nor destroyed. Bernoulli found that an increase of energy by higher velocity must be compensated for by lower pressure in order to conserve the energy, a theorem known as the Bernoulli principle.
The cleaning operation is divided into two phases. During the first phase, the flushing valve opens and larger particles are flushed out. In the second phase, the disc makes two strokes into the basket and vacuum cleans the debris from the basket. Any remaining particles from the first stoke are removed in a second stroke. A cleaning operation is started either by using a preset time interval or a differential-pressure switch that measures the degree of clogging. Target applications include cooling towers and plate heat exchangers as well as ocean and river water filtration.
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