Chromalox Big Red Book
Technical
Technical Information Allowable Watt Density & Heater Selection - Air Heating
Graph G-154-1 — Fintube ® & Tubular Heaters Sheath Temperatures with 16 FPS Distributed Air Velocity
Graph G-151-1 — Fintube ® & Tubular Heaters Sheath Temperatures with 1 FPS Distributed Air Velocity
40 35 30 25 20 15 10 5
40 35 30 25 20 15 10 5
Limit for Finned Tubular for Normal Life Expectancy
Limit for Finned Tubular for Normal Life Expectancy
1 2 0 0 ° F
1 4 0 0 ° F
1 4 0 0 ° F
2 0 0 ° F 4 0 0 ° F 6 0 0 ° F 7 0 0 ° F 8 0 0 ° F 1 0 0 0 ° F
1 2 0 0 ° F
4 0 0 ° F 2 0 0 ° F 6 0 0 ° F 8 0 0 ° F 9 1 0 ° F 1 0 0 0 ° F 80 70 60 50 40 30 20 10 0 Watt Density in W/In 2 of Effective Length
80 70 60 50 40 30 20 10 0 Watt Density in W/In 2 of Effective Length
Tubular Units
Tubular Units
Finned Tubular Units
Finned Tubular Units
0
200
400
600
800 1000 1200 1400
0
200
400
600
800 1000 1200 1400
Outlet Air Temperature (°F)
Outlet Air Temperature (°F)
Graph G-152-1 — Fintube ® & Tubular Heaters Sheath Temperatures with 4 FPS Distributed Air Velocity
Graph G-155-1 — Fintube ® & Tubular Heaters Sheath Temperatures with 25 FPS Distributed Air Velocity
40 35 30
1 4 0 0 ° F
Limit for Finned Tubular for Normal Life Expectancy
40
1 2 0 0 ° F
Limit for Finned Tubular for Normal Life Expectancy
1 2 0 0 ° F
35 30 25 20 15 10 5
1 0 0 0 ° F
25
2 0 0 ° F 4 0 0 ° F 6 0 0 ° F 80 70 60 50 40 30 20 10 0 Watt Density in W/In 2 of Effective Length 8 0 0 ° F 8 4 0 ° F 1 0 0 0 ° F Finned Tubular Units
20 15 10
8 0 0 ° F 6 4 0 ° F 6 0 0 ° F 4 0 0 ° F 2 0 0 ° F 80 70 60 50 40 30 20 10 0 Watt Density in W/In 2 of Effective Length
Tubular Units
Tubular Units
5
Finned Tubular Units
0
200
400
600
800 1000 1200 1400
Outlet Air Temperature (°F)
0
200
400
600
800 1000 1200 1400
Outlet Air Temperature (°F)
Graph G-153-1 — Fintube ® & Tubular Heaters Sheath Temperatures with 9 FPS Distributed Air Velocity
Graph G-156-1 — Fintube ® & Tubular Heaters Sheath Temperatures with 36 FPS Distributed Air Velocity
40
1 2 0 0 ° F
1 4 0 0 ° F
Limit for Finned Tubular for Normal Life Expectancy
40
35
Limit for Finned Tubular for Normal Life Expectancy
1 0 0 0 ° F
35 30 25 20 15
30
1 0 0 0 ° F
25 20 15 10 5
8 0 0 ° F
2 0 0 ° F 4 0 0 ° F 6 0 0 ° F 8 0 0 ° F 8 4 0 ° F 80 70 60 50 40 30 20 10 0 Watt Density in W/In 2 of Effective Length
6 0 0 ° F 6 4 0 ° F 4 0 0 ° F 2 0 0 ° F 80 70 60 50 40 30 20 10 0 Watt Density in W/In 2 of Effective Length Finned Tubular Units
Tubular Units
Finned Tubular Units
Tubular Units
10
5
0
200
400
600
800 1000 1200 1400
Outlet Air Temperature (°F)
0
200
400
600
800 1000 1200 1400
Outlet Air Temperature (°F)
TECHNICAL
INFORMATION
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