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Main Advantages of the Microwave Heating

  • Speeding up: minutes instead of hours!!
  • Volume Energy transmission - cold vessel
  • ENERGY Savings, Room Savings
  • Efficiency 70%
  • Automatization
  • Safety *
  • Environment *

Comparing to the processes using the combustion


REFERENCES

ISM band

Apllied frequencies

Microwaves represent the same type of energy that used for transmitting television and radio signals. It is the variety of electromagnetic waves in the bands between radio and infrared waves (with the frequency of 300 MHz - 300 GHz, which corresponds to the wavelength of 1 m - 1 mm).


MICROWAVE (MW) HEATING

Equipment for industrial applications is, especially in Europe, based on the mostly used 2450 MHz frequency, used also for commercial MW ovens in households. At the frequency of 915 MHz, the penetration depth is more than twofold in comparison with 2450 MHz frequency. This allows to process materials with correspondingly larger dimensions. Penetration depth of microwaves is usually in the order of units and tens of centimetres.

RADIO FREQUENCY (RF) HEATING

In RF bands 13.56; 27.12 and 40.68 MHz, the penetration depth reaches the order of meters. This allows processing of larger products (or simultaneous processing of larger amount of products) than MW heating. RF systems have usually the output power tens kW to over 1500 kW.



COMPARISON OF MW AND RF HEATING

Microwaves are more suitable for piece products of adequate thickness with the loss factor less than 0.05, consisting of minor loose parts, or for the layer of loose or paste material with the corresponding height profile. Microwaves are also more suitable than radio frequencies when the requirement for the output power density is very high, because they have lower tendency to induce electric arcing that could burn the processed material, and generator tube, too. On the other hand, the RF equipment is more economical than MW equipment by the output power over 50 kW.
RF heating is applied when a deep penetration is required, and for processing materials with a high loss facor (e.g. with a high content of water).