Steam traps Manifolds and insulation jackets
8
Annual heat saving in GJ per year versus temperature for various steam temperatures These values are those used to plot the graph on the previous page
Steam temperature
Ambient temperature
100 °C
150 °C
200 °C
250 °C
300 °C
350 °C
400 °C
425 °C
-40 °C -35 °C -30 °C -25 °C -20 °C -15 °C -10 °C
4.53
7.07
10.18
13.99
18.63
24.27
31.08
34.98
4.36
6.88
9.99
13.79
18.42
24.05
30.86
34.76
4.19
6.70
9.79
13.58
18.21
23.84
30.64
34.54
4.02
6.52
9.60
13.38
18.01
23.63
30.42
34.32
3.85
6.34
9.41
13.18
17.80
23.41
30.20
34.09
3.68
6.15
9.22
12.98
17.59
23.20
29.98
33.87
3.52
5.97
9.02
12.78
17.38
22.98
29.76
33.65
-5 °C
3.35
5.79
8.83
12.58
17.17
22.76
29.54
33.42
0 °C 5 °C
3.18
5.61
8.64
12.37
16.96
22.55
29.31
33.20
3.01
5.43
8.44
12.17
16.75
22.33
29.09
32.97
10 °C
2.85
5.24
8.25
11.97
16.54
22.11
28.86
32.74
15 °C
2.68
5.06
8.05
11.76
16.32
21.89
28.64
32.52
20 °C
2.52
4.88
7.86
11.56
16.11
21.67
28.41
32.29
25 °C
2.35
4.69
7.66
11.35
15.89
21.45
28.18
32.05
30 °C 35 °C 40 °C
2.19
4.51
7.46
11.14
15.68
21.22
27.95
31.82
5.10.13
2.02
4.33
7.27
10.93
15.46
21.00
27.72
31.59
1.86
4.14
7.07
10.73
15.24
20.77
27.49
31.35
Certain assumptions have been made to compile this data: 1. Still air conditions. 2. All heat loss is by radiation. 3. Surface metal temperature is equal to operating temperature. 4. 8 760 hours operation per year.
8.10 20
Effect of wind speed The following table gives the approximate effect of air movement.
Wind speed km/h
Additional heat saving
11
16%
22
116%
33
156%
55
218%
Example 2 Example 1 provided a payback for still air conditions. If the average wind speed was 22 km/h, then the annual heat savings becomes 6 x 2.16 = 12.96 GJ/year
150
Hence:-
P =
= 1.16 years
2 x 12.96 x 5
TI-P117-11 CMGT Issue 4 Payback Calculator for IJ-MSC04, IJ-MSC08, IJ-MSC12, IJ-MSC04-H, IJ-MSC08-H and IJ-MSC12-H
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