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Electric heating designing |
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| Tube heat loss: q( per meter tube changing 1℃) |
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Warm layer Thickness（mm/in） |
| G″ |
DN |
10 |
15 |
25 |
35 |
50 |
60 |
7 |
100 |
| 1/2 |
3/4 |
1 |
1-1/2 |
2 |
2-1/2 |
53 |
4 |
|
| 1/2 |
15 |
8.86 |
6.73 |
5.74 |
4.59 |
3.94 |
3.61 |
3.28 |
2.95 |
| 3/4 |
200 |
10.34 |
7.87 |
6.56 |
5.09 |
4.43 |
3.94 |
3.61 |
3.28 |
| 1 |
25 |
12.31 |
9.02 |
7.55 |
5.91 |
4.92 |
4.43 |
4.10 |
3.61 |
| 1-1/4 |
32 |
14.77 |
10.83 |
8.70 |
6.73 |
5.58 |
4.92 |
4.59 |
3.94 |
| 1-1/2 |
40 |
17.06 |
12.30 |
10.01 |
7.55 |
6.23 |
5.58 |
4.92 |
4.27 |
| 2 |
50 |
19.69 |
14.11 |
11.32 |
8.53 |
7.05 |
6.07 |
5.42 |
4.76 |
| 2-1/2 |
65 |
23.13 |
16.57 |
13.13 |
9.68 |
7.88 |
6.89 |
6.07 |
5.25 |
| 3 |
80 |
27.56 |
19.36 |
15.26 |
11.16 |
9.03 |
7.88 |
6.89 |
5.74 |
| 3-1/2 |
95 |
31.01 |
21.82 |
17.06 |
12.3 |
10.01 |
8.53 |
7.55 |
6.23 |
| 4 |
100 |
34.45 |
24.12 |
18.87 |
13.62 |
10.83 |
9.19 |
8.21 |
6.73 |
| 4-1/2 |
115 |
37.90 |
26.41 |
20.51 |
14.77 |
11.81 |
10.01 |
8.86 |
7.22 |
| 5 |
130 |
41.83 |
29.04 |
22.48 |
16.08 |
12.80 |
10.83 |
9.52 |
7.71 |
| 6 |
150 |
49.22 |
33.96 |
26.25 |
18.54 |
14.60 |
12.30 |
10.66 |
8.70 |
| 8 |
200 |
63.16 |
43.15 |
33.14 |
23.13 |
18.21 |
15.09 |
13.13 |
10.66 |
| 10 |
250 |
77.76 |
52.99 |
40.52 |
28.05 |
21.82 |
18.05 |
15.59 |
12.47 |
| 12 |
300 |
91.70 |
62.18 |
47.58 |
32.81 |
25.43 |
21.00 |
17.88 |
14.27 |
| 14 |
350 |
100.40 |
68.08 |
51.84 |
35.60 |
27.56 |
23.46 |
19.36 |
15.26 |
| 16 |
400 |
114.2 |
77.27 |
58.73 |
40.36 |
31.01 |
25.43 |
21.82 |
17.06 |
| 18 |
450 |
128.1 |
86.46 |
65.79 |
44.95 |
34.45 |
28.22 |
24.12 |
18.87 |
| 20 |
500 |
141.9 |
95.81 |
72.68 |
49.55 |
37.90 |
31.01 |
26.41 |
20.51 |
| 24 |
600 |
169.6 |
114.2 |
86.46 |
58.73 |
44.95 |
37.08 |
31.01 |
24.12 |
| Heat loss of store pot surface q ( per sqm changing 1℃) |
| Store pot |
74.8 |
49.7 |
37.7 |
25.1 |
18.6 |
14.9 |
12.6 |
9.3 |
| Heat loss for surface is base on the 10% of designing remain ，Heating Quotiety 0.25 |
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| The heating quotiety of kinds of material under various temperature |
| heat preservation material |
Heating quoiety （ W / m ℃) |
| -10℃ |
10℃ |
50℃ |
100℃ |
150℃ |
200℃ |
| Glass Fibre |
0.033 |
0.036 |
0.040 |
0.046 |
0.053 |
0.059 |
| Cliff Cotton |
0.041 |
0.044 |
0.049 |
0.056 |
0.065 |
0.072 |
| Scoria Cotton |
0.037 |
0.04 |
0.045 |
0.051 |
0.059 |
0.066 |
| Perlite |
0.043 |
0.047 |
0.052 |
0.060 |
0.069 |
0.077 |
| Polyurethane Foam |
0.022 |
0.024 |
0.027 |
0.031 |
0.035 |
0.037 |
| Polystyrene Foam |
0.029 |
0.031 |
0.035 |
0.040 |
0.046 |
0.051 |
| Silicic Acid Calcium |
0.05 |
0.054 |
0.06 |
0.069 |
0.080 |
0.089 |
| Compound Silicate FeltFHP-VB |
0.022 |
0.0234 |
0.026 |
0.03 |
0.035 |
0.038 |
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| 3 、Rated Power for Choosing -cable |
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See the kinds of the Cable introduction |
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| 4 、Caculate the Cable Length |
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Total Length of the cable L= |
Caloric Losing for per meter Q |
× |
（Tube LengthL+The Length for each Tube
AccessoriesL） |
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Rated Power for Cable W |
| The Length for each Tube Accessories |
| Tube Accessories |
Converted Tube Length（m） |
| Flange |
0.46 |
| Pipe-supporting |
0.60 |
| Butterfly Valve |
0.76 |
| Ball Valve |
0.83 |
| Close Valve |
1.22 |
| Brake Valve |
1.50 |
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