COOLING TOWER WATER USAGE CALCULATOR
Water Make-Up Requirements of Cooling Towers
To determine how much water is consumed by a typical commercial cooling tower used in air conditioning system follow the steps below:
Enter the nominal cooling capacity of the base building or supplementary chiller or water cooled package units served by the towers, If tower capacity is known, divide it by 1.3 and enter in chiller capacity
Enter cooling tower's annual operation days (consult BMS log or building manager for existing buildings)
Enter average daily operation hours of the cooling tower (consult BMS log or building manager for existing buildings)
Enter average HOR capacity per year (0.5 for typical office building, 1 for data center with stable IT heat rejection profile)
Enter drift windage loss (assume 10% for typical application)
Input blowdown cycle of concentration (obtain from water treatment company or BMS system if available)
Note(s):
COC can range between 4-8, depending on the make-up water quality, treatment system efficiency, tower's efficiency in removing heat, etc. A typical COC of 5 can be used if this figure is unkown at this stage for an estimation
COC = Cycle of Concentration
HOR = Heat of Rejection
The calculator will provide an estimated water usage of the cooling tower system.