Introduction:
(IR) What is the heat radiation/ Infrared beams ?
According
to the Heat Radiation description, it is considered as an energy
radiant diffused by a luminary in an area as an electromagnetic wave forms
within a range approximately 0,04 and 800 mm beam gap width .While the
visible light includes the wave band of 0,04… 0,8mm , the subsequent wave
band from 0,08 to 800 mm includes main part of the heat radiation.
a way that the warmer object supplies heat warmth and sends infrared beams
to the colder one. The infrared beam is a direct warming up method in which
the heat energy is transfered by the electromagnetic beam. The products to
be warmed up are exposed to the beam produced by the electrical heating
devices, it can also be named as heater. Heat radiation used in the industrial
area is between 0,8 and 10 µm.
INFRATEC
– Infrared transmitter
INFRATEC - Electrical infrared transmitters work in emission area between 0,8
and 3 µm. The transmitters area of the gaseous are between 1,9 and 3 µm.
The radiant heat does not require any transmitting mediums, e.g. gases (air)
or steams during convective heat transfer or metals or other hard materials
during transmission by thermal conduction. Therefore, (Infrared) the condition
of air or gas is unimportant between transmitter and pieces/ material for heat
transfer with IR transmitters.
The extensive tests showed that the medium wave transmitters whose heat conductor
degree is between 850 and 900 ºC and beam width is 2,3 and 2,7 µm
are suitable for the dying and powder drying area. The absorption degrees of
plastics and dyes are generally determined by CH-band (whose main absorption
is 3,5 µm) and OH-band( whose main absorption is 3,0 µm).
A best drying or gelation can only be obtained when the transmitters are on
shorter wave than the main absorption area of plastics.
Certain Sizes for the transference of the radiant heat are :
| - Emission of ray surfaces , | i.e the transference of energie |
| - Absorption of radiated surface, | i.e
definite energy absorption or relative ratio on noticed amount of heat |
| - Reflection of radiated surfaces, | i.e
The difference between input and output Energy or the relative ratio of energy coming from input energy to output energy . |
| - Permeability of radiated surfaces, | i.e
the relative ratio of the energy passed on from the surface to the penetrated surface . |
| For
the ideal case of the radiation heating , their absorption values |
|
High efficiency,
since no carrier medium is necessary for the transfer of energy, thus, unnecessary
losses can
be avoided and reduced to a minimum ratio.
Examples for the principles of heat transmission
The
emitted radiation energy and used emission spectrum depend on the temperature
and radiating surface..
General
sub-section means:
Up to 500 ºC - the radiating surface temperature: dark beam with long wavy
radiation
Over 500 ºC-the radiating surface temperature: red beam with medium and
short wave
900ºC
Maximum wavelength with approx.2.5 mm have a characteristic emission spectrum
which is suitable for
the absorption spectrum of lots of products. This basic spectrum can be changed
by the alteration of glowed surface temperature.
| One of the principal functions is to prevent the so-called “radiation shadow” and operate by a fresh radiation dryer without any additional heat energy at IR-Zone area. Moreover,
special reflectors are developed in a type of “billiard effect” and consequently,
“radiation shadow” is avoided. By way of rinsing around the reflectors
with air, the indecision particles and dusts are sent to the filter mechanism
of the fan. .
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