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Application Guide catalog - Watlow - #32

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Application Guide
Kilowatt-Hours to Heat Air—Ref. 21
Electric Heaters
Quick Estimates of Wattage Requirements
Continued
Amt.
of
Temperature Rise °F
Air
CFM
50°
100°
150°
200°
250°
300°
350°
400°
450°
500°
600°
100
1.7
3.3
5.0
6.7
8.3
10.0
11.7
13.3
15.0
16.7
20.0
200
3.3
6.7
10.0
13.3
16.7
20.0
23.3
26.7
30.0
33.3
40.0
300
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
60.0
400
6.7
13.3
20.0
26.7
33.3
40.0
46.7
53.3
60.0
66.7
80.0
500
8.3
16.7
25.0
33.3
41.7
50.0
58.3
66.7
75.0
83.3
100.0
600
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
120.0
700
11.7
23.3
35.0
46.7
58.3
70.0
81.7
93.3
105.0
116.7
140.0
800
13.3
26.7
40.0
53.3
66.7
80.0
93.3
106.7
120.0
133.3
160.0
900
15.0
30.0
45.0
60.0
75.0
90.0
105.0
120.0
135.0
150.0
180.0
1000
16.7
33.3
50.0
66.7
83.3
100.0
116.7
133.3
150.0
166.7
200.0
1100
18.3
36.7
55.0
73.3
91.7
110.0
128.3
146.7
165.0
183.3
220.0
1200
20.0
40.0
60.0
80.0
100.0
120.0
140.0
160.0
180.0
200.0
240.0
Use the maximum anticipated airflow. This equation assumes insulated duct (negligible heat loss). 70°F inlet air and 14.7 psia.
For Air:
Use equation or table.
kW = CFM* x Temperature Rise (°F) 3000
OR
kW = Cubic Meters/Min* x Temperature Rise (°C) 47
For Compressed Air:
kW = CFM** x Density** x Temperature Rise (°F) 228
OR
kW = Cubic Meters/Min** x Temperature Rise (°C) x Density (kg/m3)**
57.5
*Measured at normal temperature and pressure. **Measured at heater system inlet temperature and pressure.
32
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