Application Guide catalog - Watlow - #28

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Text version of the page
Untitled
Application Guide
Electric Heaters
Heat Loss Factors
and Graphs
Continued
Ref. 12
2600 2400 2200 2000 1800 1600 1400 1200 1000
800 600 400 200
Hea
t Los
ses
from
Vert
ical
nsul
ated
Surf
aces
Y
f\
/ *
f
- ,\<\'
^>
>n._
'-
c
" Insi
jlatio
n
1. Based upon combined natural convection and radiation losses into 70°F environment.
2. Insulation characteristics k = 0.67 @ 200°F
k = 0.83 @ 1000°F.
3. For molded ceramic fiber products and packed or tightly packed insulation, losses will be lower than values shown.
For 2 or 3 inches Insulation multiply by 0.84 For 4 or 5 inches Insulation multiply by 0.81 For 6 inches Insulation multiply by 0.79
o
3
a
q.
E
a
0 01 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 11
Losses—W/in2
Ref. 13
1.2 1.3 1.4 1.5 1.6 1.7 1.8
1400
1300 1200 1100 1000 of 900 800 700 600 500
H
eat
Los
ses f
rom
Hor
zontal M
etal
Sur
ace
s
A
S"-
/
4&
__
r
4
_c
A
- w<?
?
- rc
-A
_,
--
—'
#/
m
T
A
C
A
y
/
~&
L
V\
/
/ /
0
1 2 3 4 5 6 7
910 11 12 13 14 15 16 17 18 19 20
Losses—W/in2
Ref. 14
For losses of molten metal surfaces, use the curve e=0.40.
°l
e c a
f r
u
210 190 170 150
C
om
bin
ed
Co
nve
ctio
n a
nd
Radiation L
oss
es
from Water Surfaces
P
—'
__
.60°
—-
-an0
1
__■
.—
s'
y
/
r— y
/,
✓1
~7
/
f
of
e
r
u
t
a
r
e
q.
m
e
30 110
90 70
0
100 200 300
400
500 600 700 800
Losses W/ft2
900 1000 1100 1200 1300
28

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