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Application Guide catalog - Watlow - #30

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Untitled
Application Guide
Electric Heaters
Quick Estimâtes of Wattage Requirements
The following tables can be used to make quick estimâtes of wattage requirements.
For Steel: Use table or metric equation. kW = Kilograms x Temperature Rise (°C) 5040 x Heat-up Time (hrs.)
kW = Pounds x Temperature Rise (°F) 20,000 x Heat-up Time (hrs.)
Kilowatt-Hours to Heat Steel*—Ref. 17
Amount
of Steel
Temperature Rise °F
50°
100°
200°
300°
400°
500°
600°
(Ib.)
Kilowatts to Heat in One Hour
25
0.06
0.12
0.25
.37
0.50
0.65
0.75
50
0.12
0.25
0.50
.75
1.00
1.25
1.50
100
0.25
0.50
1.00
1.50
2.00
2.50
3.00
150
0.37
0.75
1.50
2.25
3.00
3.75
4.50
200
0.50
1.00
2.00
3.00
4.00
5.00
6.00
250
0.65
1.25
2.50
3.75
5.00
6.25
7.50
300
0.75
1.50
3.00
4.50
6.00
7.50
9.00
400
1.00
2.00
4.00
6.00
8.00
10.00
12.00
500
1.25
2.50
5.00
7.50
10.00
12.50
15.00
600
1.50
3.00
6.00
9.00
12.00
15.00
18.00
700
1.75
3.50
7.00
10.50
14.00
17.50
21.00
800
2.00
4.00
8.00
12.00
16.00
20.00
24.00
900
2.25
4.50
9.00
13.50
18.00
22.50
27.00
1000
2.50
5.00
10.00
15.00
20.00
25.00
30.00
Read across in table from nearest amount in pounds of steel to desired temperature rise column and note kilowatts to heat in one hour.
Includes a 40 percent safety factor to compensate for high heat losses and/or low power voltage.
Kilowatt-Hours to Heat Oil*—Ref. 18
For Oil:
Use equation or table.
kW = Gallons x Temperature Rise (°F) 800 x Heat-up time (hrs.)
OR
kW = Liters x Temperature Rise (°C) 1680 x Heat-up time (hrs.)
1 cu. ft. = 7.49 gallons
Cubic
Feet
400°
Gallons
50°
100°
0.5
3.74
0.3
0.5
1
2
2
3
1.0
7.48
0.5
1.0
2
3
4
6
2.0
14.96
1.0
1.0
2
4
6
11
3.0
22.25
2.0
3.0
6
9
12
16
4.0
29.9
2.0
4.0
8
12
16
22
5.0
37.4
3.0
4.0
9
15
20
25
10.0
74.8
5.0
9.0
18
29
40
52
15.0
112.5
7.0
14.0
28
44
60
77
20.0
149.6
9.0
18.0
37
58
80
102
25.0
187
11.0
22.0
46
72
100
127
30.0
222.5
13.0
27.0
56
86
120
151
35.0
252
16.0
31.0
65
100
139
176
40.0
299
18.0
36.0
74
115
158
201
45.0
336.5
20.0
40.0
84
129
178
226
50.0
374
22.0
45.0
93
144
197
252
55.0
412
25.0
49.0
102
158
217
276
60.0
449
27.0
54.0
112
172
236
302
65.0
486
29.0
58.0
121
186
255
326
70.0
524
32.0
62.0
130
200
275
350
75.0
562
34.0
67.0
140
215
294
375
Read across in table from nearest amount in gallons of liquids to desired temperature rise column and note kilowatts to heat in one hour.
Add 5 percent for uninsulated tanks.
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