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Terminology and calculation of circulating water cooling tower system
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1.Recirculating water cooling tower system term and calculation common term explanation
1.1 Supplementary water: For the amount of water lost from the circulating cooling water system due to cooling tower evaporation, sewage discharge, wind blowing (spatter), the necessary supplementary water is called supplementary water.
1.2 Evaporation loss: A hot circulating cooling water in an open circulating cooling water system is cooled by evaporation in a cooling tower, and the amount of water lost during this process is called evaporation loss.
1.3 Windfall loss: the amount of water lost when air flows from the system into the atmosphere are ventilated.
1.4 Discharge or discharge rate: the amount of water discharged to maintain a certain concentration multiple in the system.
1.5Cooling range or temperature drop: temperature difference between inlet of cooling tower and outlet of catchment pool.
1.6Circulating quantity: The amount of circulating water in the system, which is a function of time.
1.7 Concentration multiple (K): The ratio of dissolved salts contained in the cooling water during the cycle, due to the loss of evaporation, is continuously concentrated in the circulating cooling water system, so that the salt content in the cooling water is higher than the salt content in the supplement, and the ratio of the two is called the concentration multiple.
1.8 System Volume: The sum of all water capacities in an open cooling water system, including the effective volume of the cooling tower pool and the system piping. water side volume of heat exchanger, etc.
1.9 Total dissolved solids
1.10 alkalinity: the sum of bicarbonate, carbonate and hydroxide in water.
1.11 RS stability index: used to judge the scaling and corrosion trend of water.
2、 Abbreviations:
2.1 water make-up rate: M
2.2 evaporation loss: e
2.3 wind loss: D
2.4 blowdown or discharge rate: B
2.5 cooling range or temperature drop: △ t
2.6 circulation: R
2.7 concentration multiple: K
2.8 system volume: HC
2.9 total solution: TDS
2.10 ryznar stability index: i.s
3. Calculation
3.1 concentration multiple:
K = (conductivity or K + or Na + in circulating water) ÷ (conductivity or K + or Na + in make-up water)
3.2 supplementary quantity:
M = E × K /（K-1）
M = B+E+D
3.3 emissions:
B = E÷K×△T
3.4 time per cycle = HC ÷ R
3.5 evaporation capacity:
E = R * /r
R (latent heat of evaporation): 573 (kcal / kg) 43 ℃
574 (kcal / kg) 40 ℃
577 (kcal / kg) 35 ℃
3.6 wind loss:
D = R * 0.1%
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