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Plastics catalog - Watlow - #401

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Text version of the page
eference Data
Kilowatt-Hours to Heat Steel*
Quick Estimates of Wattage Requirements
The following tables can be used
to make quick estimates of wattage requirements.
Temperature Rise °F
Amount
of Steel
50°
100°
200°
300°
400°
500°
600°
(lbs.)
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
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.)
* 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*
For Oil:
Use equation or table.
kW = Gallons x Temperature Rise (°F)
Amount of Oil
mperature Rise °F
Cubic Feet
Gallons
50°
100°
200°
300°
400°
5
00°
0.5 1.0 2.0 3.0 4.0
3.74 7.48 14.96 22.25 29.9
0.3 0.5 1.0 2.0 2.0
0.5 1.0 1.0 3.0
4.0
1
2 2 6 8
2 3 4 9 12
2 4 6 12 16
3 6 11 16 22
5.0 10.0 15.0 20.0 25.0
37.4 74.8 112.5 149.6
187
3.0 5.0 7.0 9.0
11.0
4.0
9.0 14.0 18.0
22.0
9 18 28 37
46
15 29 44 58
72
20 40 60 80
100
25 52 77 102
127
30.0 35.0 40.0 45.0 50.0
222.5
252
299
336.5
374
13.0
16.0 18.0 20.0 22.0
27.0
31.0 36.0 40.0
45.0
56
65 74 84 93
86
100 115 129 144
120 139 158 178 197
151 176 201 226 252
55.0 60.0 65.0 70.0 75.0
412 449 486 524 562
25.0 27.0 29.0 32.0 34.0
49.0
54.0 58.0 62.0 67.0
102 112 121 130 140
158 172 186 200 215
217 236 255 275 294
276 302 326 350 375
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
<D u) o
c
-*
o
13
(B
—h
(B
(B 3
o e
0) 3
a
a
t
a
3
o
-*
3 o
3
* 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.
401
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