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Finned Tubular Heaters, Finned Tubular Elements

Finned Tubular Element:1

View listed 0.315" & 0.430" Tubular element diameter specs.

Finned Tubular Element 2
Finned Tubular Element:2

View listed 0.315" & 0.430" Tubular element diameter specs.

Finned Tubular Heaters - Description

Finned Tubular Heaters are normally used in forced circulation heating of low temperature air, other atmospheres and gases. Typical applications include forced convection heating of air, process atmospheres, and oven atmospheres in duct environments. Steel finned tubular heaters are standard with surface temperatures limited to about 425ºC (797ºF) compared to 815ºC (1500ºF) for an alloy sheathed non-finned heater.
Some applications require stainless steel materials for corrosion resistance. The most efficient finned heaters are made with steel sheath and steel fins. Steel is normally used for air heating, stainless steel for atmospheres which are humid or corrosive and monel for salt-laden humid atmospheres. Keep in mind that stainless heaters with stainless fins are very inefficient since the heat transfer rate of stainless is less than one quarter that for steel.

Finned Tubular Heaters offer distinct advantages over open coil heaters: (a) they are safer to operate in that the risk of fire or electrical shock are minimized; (b) they have a much longer service life; and (c) they are more rugged requiring less maintenance than open coil heaters.

Quick Estimates:

Wattage required to heat air flows -
Table of wattage required to heat air at various CFM (cubic feet/minute) flows and temperature rises.

Finned Tubular Element:3

Figure 3 - 0.315"
kw	L	part no.
1 2 3 4 5 6	6 10 13 17 20 24	ASB-301W ASB-302W ASB-303W ASB-304W ASB-305W ASB-306W

nominal dimensions
A=L-F
C=4½"
F=5/8"
W=5½"

Figure 3 - 0.430"
kw	L	part no.
2 3 4 5 6 7 8	7 10 14 17 20 23 26	ASB-402W ASB-403W ASB-404W ASB-405W ASB-406W ASB-407W ASB-408W

nominal dimensions
A=L-F
C=6"
F=5/8"
W=7 1/8"

Finned Tubular Element 4
Finned Tubular Element:4

Figure 4 - 0.315"
kw	L	part no.
1 2 3 4 5 6	20.5 35.5 50.5 65.5 80.5 95.5	ASB-301SF ASB-302SF ASB-303SF ASB-304SF ASB-305SF ASB-306SF

nominal dimensions
F=2 1/8"

Figure 4 - 0.430"
kw	L	part no.
2 3 4 5 6 7 8	28.5 40.5 53.5 65.5 78.5 90.5 103.5	ASB-402SF ASB-403SF ASB-404SF ASB-405SF ASB-406SF ASB-407SF ASB-408SF

nominal dimensions
F=2 1/8"

Finned Tubular Element 5
Finned Tubular Element:5

Figure 5 - 0.315"
kw	L	part no.
1 2 3 4 5 6	10.5 17.5 25.5 32.5 40.5 47.5	ASB-301UF ASB-302UF ASB-303UF ASB-304UF ASB-305UF ASB-306UF

nominal dimensions
C=1½"
F=2 1/8"
W=2½"

Figure 5 - 0.430"
kw	L	part no.
2 3 4 5 6 7 8	14.5 21.56 27.5 33.5 39.5 45.5 52.5	ASB-402UF ASB-403UF ASB-404UF ASB-405UF ASB-406UF ASB-407UF ASB-408UF

nominal dimensions
C=2"
F=2 1/8"
W=3 1/8"

Finned Tubular Element 6
Finned Tubular Element:6

Figure 6 - 0.315"
kw	L	part no.
1 2 3 4 5 6	7.5 11.5 14.5 18.5 21.5 25.5	ASB-301WF ASB-302WF ASB-303WF ASB-304WF ASB-305WF ASB-306WF

nominal dimensions
A=L-F
C=4½"
F=2 1/8"
W=5"

Figure 6 - 0.430"
kw	L	part no.
2 3 4 5 6 7 8	8.5 11.5 15.5 18.5 21.5 24.5 27.5	ASB-402WF ASB-403WF ASB-404WF ASB-405WF ASB-406WF ASB-407WF ASB-408WF