IR vs. convection
Heraeus Noblelight
Heat transfer by...
Vibration
Induction
C f ti
Confection
Conduction
Electronic Beam
Infrared Radiation
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Heraeus Noblelight
Infrared Heat
Hot Air / Convection
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Heraeus Noblelight
Heat Transfer by Convection
Fan
Heating element
Air/gas
Material to be heated
Heat will be transferred by gas/air to warm up the material
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Heraeus Noblelight
Heat Transfer by IR Radiation
Oscillation energy = function of temperature
B d with
Body
ith hi
higher
h temperature
t
t
= Emitter
E itt
Electromagnetic waves
Body with lower temperature
Excitation of atoms and molecules by electromagnetic waves
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Heraeus Noblelight
Heat Transfer Capacity
kW/m2
80
Infrared Heat
up to 1 MW/m2
short wave
60
40
medium wave
C
Convection
ti
Heat
H t
up to 40 kW/m2
20
l
long
wave
V = 10 m/s
V = 1 m/s
/
0
Source: RWE 1991
200
400
600
Temperature °C
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Heraeus Noblelight
Advantages of Infrared-Heating
compared to convection
• Approx. 50% energy saving
by direct heat transfer
• Approx. 80 % space saving by
high heating power and fast heating
eat g process
p ocess fits
ts in eas
easily
y with
t tthe
e manufacturing
a u actu g
• Heating
process
by appropriate choice of emitter / emitter cassette,
the heating can be matched to the speed of the
process
• Simple dust-free working and heat transfer
without intermediate medium.
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Heraeus Noblelight
Powder Coating of
steel cylinders
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Heraeus Noblelight
Powder Coating of steel cylinders
Length
Convection Infrared
Saving
Ca. 30m
Ca. 6m
80%
5-15 min
80%
Gelling and 30-60 min
Curing
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Th d
The
data are b
based
d on conditions
di i
off use and
d environmental
i
l iinfluences
fl
assumed
db
by H
Heraeus. Th
They
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