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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

Advanced effects of combined microwave and conventional drying

At the beginning of the process using the conventional heating considerable part of the moisture is released. This can result in overheating of the material surface forcing then interrupt the process for the possible temperatures equalizing. During those interrupts the moisture continues to evaporate spontaneously. Then microwave can push out almost the rest of moisture to the material surface being evaporated there conventionally. This can shorten the total process by even 80%.


Microwave Drying

In conventional heating the caloric transmits from the surface to the interior while the moisture is transfered opposite way from the inner to the SURFACE WHERE it is suppose to evaporate. Using deep affecting microwaves heats the inner pushing the moisture to the lower pressure space that is on the cool surface since the surrounding air is not affected by microwaves. This mechanism of water pump considerably accelerate and improves removing the moisture.

High energy efficiency

Water as extremely polar material absorbs efficiently the microwave energy converting it almost entirely to heat.  In physical principle the comparable efficiency can be hardly achieved by any other method although using the conventional heat can be caused by other factors then the efficiency.
 

Uniform and steady of the whole volume heating

From the components of the material usually the water molecules are most affected and on the contrary dry parts of the material is often MW transparent. 
 
This effect can be used for equalizing of the moisture level among the various parts of the material – in case of non uniform moisture spreading at the beginning of the process
It enables also pushing out the lawww.liquid component and autoregulation of the drying process.

Fast moisture transfer

Conventional drying of the solid state material often creates very dry layer on the surface – crust – breaking the capillary transfer of the moisture from the core. The dry crust can also insulate thermally the core of the material. Using the microwaves on the contrary avoids creating the crust since the moisture pushed from the core preserves the humid surface and supports the capillary.
 

Optimizing the temperature and regulation in microwave dry kiln

For many cases the rapid drying is far less important than the necessary condition of achieving it at relatively low temperatures (avoiding harm of the product).

  • Drying foods conventionally often degrades their thermosensible components (such as vitamins, essences…) – as well as deteriorates their organoleptic properties
  • For chemicals there is often necessary to take n to account parameters of flammability, explosiveness, or many undesirable changes. The process has to run keeping the under critical temperatures in the whole volume (such as flammable temperature, boiling temperature, sintering etc. Moreover certain dissolvents can be dried out at relatively low temperatures preventing the fire danger
  • Glues and paints can be dried out without harming the base material. Conventional methods often warm the material surface up to 180 °C while microwaves keep it down on 100°C or below. Moreover fast MW treating enables to avoid overdrying of surface layer and material damage.