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.

Two objects of different temperatures try to ballance this situation and in such
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
should be as possible as high and the reflection and permeability
values of radiated material should be as possible as low to reach
the heat transfer at higher degree.

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.
This small circulating air volume with special air circulation prevents to heat by accumulating at transmitters and homogenizes at the same time on the surface temperature of work pieces. The transmitters are adapted to the form of the work pieces configuration and/or to the passage cross section of the appropriate drying or warming up unit

.