A project team hired a water-treatment professional to analyze the makeup water

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试卷: LEED v4 OM模拟题C卷英文[查看]
A project team hired a water-treatment professional to analyze the makeup water for a cooling tower and received the following results:
Parameter/Maximum allowable concentrations/Makeup water concentrations
Calcium (CaCO3): 1,000 ppm, 200 ppm
Alkalinity: 1,000 ppm, 100 ppm
SiO2: 200 ppm, 40 ppm
Chloride: 300 ppm, 50 ppm
Conductivity - 2,000 micro siemens/cm, 400 micro siemens/cm
Which is the maximum number of cycles of concentration for this makeup water?

项目团队聘请了一位水处理专家来分析冷却塔的补给水，并得到以下结果：
参数/最大允许浓度/补给水浓度
钙（CaCO3）：1,000ppm，200ppm
碱度：1,000 ppm，100 ppm
SiO 2：200ppm，40ppm
氯化物：300ppm，50ppm
电导率：2,000微西门子/厘米，400微西门子/厘米
这种补充水的最大循环次数是多少？
A: Five (5) cycles 5次
B: Ten (10) cycles 10次
C: Eight (8) cycles 8次
D: Six (6) cycles 6次

参考答案: A

本题解释:
选择A，本题解释To find this answer, divide the maximum allowable concentrations by the makeup water concentrations for each parameter.
Calcium (CaCO3): 1,000 / 200 = 5 cycles
Alkalinity: 1,000 / 100 = 10 cycles
SiO2: 200 / 40 = 5 cycles
Chloride: 300 / 50 = 6 cycles
Conductivity: 2,000 / 400 = 5 cycles
Then pick the lowest number, which is 5 cycles.