The purpose of a cooling tower or condenser system is to reuse and cut back water utilization. Determining the conductivity set level of the system is necessary to maximum your water reuse. Conductivity is the electrical resistance measurement of the dissolved solids, suspended solids, and dissolved gases of the water and is expressed in micro ohms (uomhs).
Corrosion inhibitors and scale prevention chemicals are used to maximize the variety of cycles. The definition of cycles is the number of times the water is reused within the water system. For instance, if the make-up water to the cooling tower is a hundred uomhs and your tower recirculating is 800 uomhs, your cycles are calculated as follows:
Cycles = Cooling Tower Recirculating Conductivity / Cooling Tower Make-up Water
For this example: Cycles = 800 uomhs / 100 uomhs or 8
P.c blowdown for the tower is calculated the next approach:
P.c Blowdown = ( 1 / Cycles) x a hundred
For this instance: Percent Blowdown = (1/8) x a hundred = 12.5%
This means 12.5% of the water is being misplaced to blow down. Understanding your tower cycles is essential for minimizing water usage and decreasing the amount of water lost to blowdown. Determining proper cycles or conductivity set point is dependent on the water alkalinity and calcium. Each system is exclusive.
Altering your cycles from 2 to 8 equates to a 38% water savings (50% – 12.5% = 38.5%). Going from 8 to 12 is just a water savings of three.4% (12.5 % – 9.1%).
Working your cycles at a higher rate has minimal profit past 8 cycles. Going from 8 to 12 cycles elevated the recirculating water impurities by 33%. Many instances water techniques are burdened to the point of scaling. There is no such thing as a need to take the added scaling threat for minimal water savings.