What is the difference between conventional heating (Surface heating) & Microwave heating?

  In conventional or surface heating, the process time is restricted due to the rate of heat flow into the material depending of various factors. Surface heating is not only slow, but also non-uniform with the surfaces, edges and corners being much hotter than the inside of the material. Resulting into inconsistent quality, which is frequently inferior to the desired result.

Product rejections, wasted energy and extended process times are limitations of surface heating. Sluggish performance of conventional heating makes it slow to respond to changes in production requirements making their control difficult, subjective and expensive.

Conversely, with microwaves, heating the volume of a material at substantially the same rate is possible. This is known as volumetric heating. Energy is transferred through the material electro-magnetically, not as a thermal heat flux. Therefore, the rate of heating is not limited and the uniformity of heat distribution is greatly improved. Heating times can be reduced to less than one percent of that required using conventional techniques.


What are the advantages of Microwave heating?

  Because volumetric heating is not dependent on heat transfer by conduction or convection, it is possible to use microwave heating for applications where conventional heat transfer is not enough. One example is fluids containing particulates where the identical heating of solids and liquids is required to minimize over-processing. Another is for obtaining very low final moisture levels for product without over-drying. Other advantages include:

» Increased Production Rate and Reduced Production cost
» Compact in size so reduced space requirements
» Precise and speedy controls
» Less cleaning efforts, time and chemical costs
» Microwaves are a non-contact drying technology, which is beneficial in many industries to improve the     quality of production
» Uniform temperature and moisture profiles can be achieved


Is it safe to use Microwave heating Systems?

  As they say, "Precaution is better than cure!" Microwave heating System and equipments have in built MICROWAVE LEAK PROOF Technology. This assures no health or safety hazard to the equipment operators. Moreover all the equipments have safety locks that avoid the microwaves if the equipment is not locked properly and leakage detectors that shut down power right away.


Is Microwave heating an economic solution?

  A wide spread myth is that microwave heating is always highly expensive than conventional techniques. However, the fact is it is more economic than conventional heating methods.

It seems to be expensive when cost of equipments is considered. But one goes deep and studies the use, advantages, time consumption, quality improvement and so many other factors; it is easy to understand that how economic it is!

Here are some points to As a Pre-Dryer in combination with conventional dryers the overall production capacities can be increased by 25 to 33%.


What are maintenance procedures and their cost implications?

  Magnetron is the only part that requires maintenance, and usually after long intervals. The repair cost is about two third in most of the cases. However, malfunction or misuse through incorrect operation leads to complete replacement which takes just about 30 minutes. Usual operating life is one year or 8,000 hours of operation.

This might seem to be an expensive maintenance but if you compare it to the various cleaning, inspection, inventory, chemical and cleaning / maintenance labour cost of conventional heating techniques you will find Microwave heating to be very economic in the long run.