What is the evaporation rate of water in the circulating water tower? What percentage of the entire system does it account for?
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What is the evaporation rate of water in the circulating water tower? What percentage of the entire system does it account for?
1) Evaporation rate (WE) in kg/h: In typical air conditioning applications, with Tw1-Tw2 = 5℃, WE = 0.0083×L, which means that 0.83% of the circulating water volume evaporates. 2) Water drift rate (WD) in kg/h varies depending on the design of the cooling tower and the ventilation speed; generally, it is as follows: for open-type towers, it is 0.3% of the circulating water volume, while for closed-type towers, it is 0.15% of the circulating water volume. 3) Wastewater discharge rate (WB) in kg/h varies depending on water quality and the concentration factor. Both open and closed types are 0.3% of the circulating water volume. Water replenishment volume (ΔL) kg/h: The water replenishment volume is the sum of the above three values. (ΔL = WE + WD + WB)
Please refer to the link http://bbs.hcbbs.com/viewthread.php?tid=58778, where there is a relatively comprehensive discussion.
In an open-loop circulating cooling water system, the water loss due to evaporation is generally around 0.83% of the total circulating water volume.
The empirical water replenishment rate for naturally ventilated cooling towers is approximately 1.5%, while it is around 1.8% for mechanically ventilated ones.
The amount of water evaporated in an open-loop circulating water system is also related to the external temperature and air pressure to a certain extent. The higher the external temperature, the greater the amount of water that evaporates.
The evaporation loss amount E = e(t1-t2)/100*(R-B), where e is the loss coefficient; its value ranges from 0.06 to 0.16 depending on the season (outside temperature). t1, temperature difference between inlet and outlet at t1. Estimate the evaporation loss using this formula
Depending on the season and the system, it is approximately 0.7% to 1.6% of the total circulating water volume
The evaporation rate of mechanically ventilated cooling towers is approximately 1.5~2%, varying between winter and summer; it is higher in summer and lower in winter.