Applied Membranes AA Series, Руководство по эксплуатации

Страница: 22 / 28

AA System Operation Manual
Page 21 of 27
© 2007
Temperature of the feed water and the net driving pressure across the element must be taken
into account before comparing or evaluating the performance of a membrane element or a
reverse osmosis system.
Temperature Correction Factor
The water temperature is one of the key factors in the performance of the reverse osmosis
membrane element. The higher the temperature, the more the product flow, and vice versa.
All reverse osmosis membrane elements and systems are rated at 77° Fahrenheit (25° Celsius).
To find the membrane permeate rate at a different temperature, follow these steps:
Find the temperature correction factor (TCF) from the below table. Divide the rated permeate
flow at 77° Fahrenheit by the temperature correction factor. The result is the permeate flow at
the desired temperature.
EXAMPLE
QUESTION:
For a thin-film membrane permeate rated at 1800 gallons per day at 77º Fahrenheit, what is the
actual permeate rate at 59º Fahrenheit?
ANSWER:
Temperature correction factor (from below table) for 59ºF = 1.47
Permeate flow at 59 degrees Fahrenheit = 1800 ÷ 1.47 = 1224 gallons/day
Feed Water Temperature
C º Fº
TCF for
Thin Film
TCF for
CTA/CAB
1 33.8 3.64 2.23
2 35.6 3.23 2.15
3
37.4 3.03 2.08
4 39.2 2.78 2.00
5
41 2.58 1.93
6 42.8 2.38 1.87
7
44.6 2.22 1.80
8 46.4 2.11 1.74
9
48.2 2.00 1.68
10 50 1.89 1.63
11
51.8 1.78 1.57
12 53.6 1.68 1.52
13
55.4 1.61 1.47
14 57.2 1.54 1.42
15
59 1.47 1.38
16 60.8 1.39 1.33
17
62.6 1.34 1.29
18 64.4 1.29 1.25
19
66.2 1.24 1.21
20 68 1.19 1.17
21
69.8 1.15 1.13
22 71.6 1.11 1.10
23
73.4 1.08 1.06
24 75.2 1.04 1.03
25
77 1.00 1.00
Feed Water Temperature
C º Fº
TCF for
Thin Film
TCF for
CTA/CAB
26 78.8 0.97 0.97
27 80.6 0.94 0.94
28 82.4 0.91 0.91
29 84.2 0.88 0.89
30 86 0.85 0.86
31 87.8 0.83 0.83
32 89.6 0.80 0.81
33 91.4 0.77 0.79
34 93.2 0.75 0.76
35 95 0.73 0.74
36 96.8 0.71 0.72
37 98.4 0.69 0.71
38 100.4 0.67 0.68
39 102.2 0.65 0.66
40
104 0.63 0.65
41 105.8 0.61
42
107.6 0.60
43 109.4 0.58
44
111.2 0.56
45 113 0.54
46
114.8 0.53
47 116.6 0.51
48
118.4 0.49
49 120.2 0.47
50
122 0.46