Dielectric heating for industrial processes.

  • 4.88 MB
  • English
BNCE , London
ID Numbers
Open LibraryOL14133747M

The Report on Manufacturing Industrial Process Furnaces, Ovens, Induction and Dielectric Heating Equipment, and Kilns Excluding Cement, Chemical, and Wood Kilns: World Market Segmentation by City: Economics Books @ generators are a comparatively new development for industrial heating and have only a limited output power.

Tube generators can have an output power of several kW. Microwave- and Radio Frequency Heating In a high frequency heating process, the high frequency waves heat the lossy dielectric File Size: KB. Article Views are the COUNTER-compliant sum of full text article downloads since November (both PDF and HTML) across all institutions and individuals.

Dielectric heating includes microwave and radio frequency (RF) heating, and is a process in which nonmetallic materials are heated by absorbing high-frequency electromagnetic radiation.

Heat is generated from within the object being heated. The objectives of this book are twofold: To identify and describe the range of industrial and. MW heating is also called dielectric heating, because of the dielectric employed to absorb MW irradiation.

To avoid interference with telecommunications and cellular phone frequencies, MHz ( in the United Kingdom) and MHz are two frequencies usually used for MW heating for industrial, scientific, and medical applications [3].

Details Dielectric heating for industrial processes. FB2

J.G. Brennan, in Encyclopedia of Food Sciences and Nutrition (Second Edition), Principles. Here the term dielectric heating is used to represent the radiofrequency (RF) and microwave (MW) bands of the electromagnetic spectrum. RF heating is in the frequency range 1– MHz and MW from MHz to GHz.

By international agreement, certain frequencies have been allocated for industrial.

Description Dielectric heating for industrial processes. FB2

Dielectric Heating. Dielectric heating is one of the most common applications for not only industrial, but also domestic microwave systems. The microwave ovens used at home are heating Dielectric heating for industrial processes.

book food based on this principal, while industrial microwave systems also cover applications like drying of materials, sintering of ceramics, vulcanisation of rubber, waste management and others. Dielectric properties govern the efficiency and quality of the heating process (Curet, Rouaud, & Boillereaux, ).

Occurrence of dipolar interactions due to penetration of microwaves in food generates molecular motion and intermolecular friction (Salazar-Gonzalez, San Martin-Gonzalez, Lopez Malo, & Sosa-Morales, ). Whereas in a dielectric heating system, the material to be heated is placed in between two conducting plates, to which electric field is applied and heat is generated inside the material.

Now a day’s dielectric heating has found many applications in the agriculture industry, for implementation of.

Shop for Books on Google Play. Browse the world's largest eBookstore and start reading today on the web, tablet, phone, or ereader. Go to Google Play Now» Industrial Electronics. Technical Publications, - pages. dielectric heating control.5/5(2). high production quality heating method, depending on its characteristics of volumetric heating generation and mecha-nism.

Dielectric treatment includes microwave (MW, and MHz) and radio frequency (RF, and MHz) heating for industrial applications (Alfaifi et al., ).

MW processing has been attracting extensive. Continuing development of dielectric heating systems allows much wider use by industry to attain higher levels of production efficiency, savings of energy and materials and in some cases to enable entirely new methods of production to be used.

Dielectric heating, also known as electronic heating, radio frequency heating, and high-frequency heating, is the process in which a radio frequency (RF) alternating electric field, or radio wave or microwave electromagnetic radiation heats a dielectric material.

At higher frequencies, this heating is caused by molecular dipole rotation within the dielectric.

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Dielectric heating is a term that covers both radio frequency and microwave systems [9]. Dielectric heating for industry employs two different types of power systems, each covering Manuscript received Ma This work was supported in part by the Australian Government APAI scholarship, Industrial Microwave Process.

It also offers a high power density: it can reach high temperatures at high speed, homogeneously distributed over the work-piece. It’s suitable for automation, and leads to very precise control of heat localization.

Dielectric Heating. This is used for materials with proper dielectric characteristics, namely good electrical insulators. SinceRichardson Electronics has been supplying power grid tubes to the induction and dielectric heating industries.

Our commitment to these industries is second to none. Not only do we supply the components you need from leading manufacturers, we also make technical expertise available when you need it, including retrofitting existing.

Various methods of producing heat for general industrial work, heating of buildings and for welding may conveniently are classified as follows: i.

Direct-resistance Heating- Current is passed through the body to be heated. A few industrial processes, including resistance welding, employ this method. It is also used in electrode boiler. The frequencies used in dielectric heating are higher than those of induction heating and much lower than those of JR.

[The RF frequency used for preheating is 50 to megahertz; MW industrial frequency is megahertz and commercial (home) MW systems operate at megahertz.]. Dielectric heating. Dielectric heating is yet another promising process of uniform sterilization of food products. Radio frequency and microwave heating are used following the principle of dielectric heating.

The process allows heating a dielectric material with the help of high frequency alternating electric field, microwave. Drying is traditionally defined as that unit operation which converts a liquid, solid or semi-solid feed material into a solid product of significantly lower moisture content.

In most, although not all, cases it involves the application of thermal energy, which causes water to evaporate into the vapour phase. In practice, this definition encompasses a number of technologies which differ 5/5(1).

RF heating is in the frequency range 1– MHz and MW from MHz to GHz. By international agreement, certain frequencies have been allocated for industrial use, in order to avoid interference with telecommunications.

The definition of dielectric heating can be stated as – ‘the process of heating up material by causing dielectric motion in its. industrial, scientific and medical purposes (Metaxas & Meredith, ). In conventional heating processes, energy is transferred to material by convection, conduction and radiation phenomena is frequently used in dielectric heating literature providing indications of how the.

Electric heating is a process in which electrical energy is converted to heat applications include space heating, cooking, water heating and industrial processes. An electric heater is an electrical device that converts an electric current into heat.

The heating element inside every electric heater is an electrical resistor, and works on the principle of Joule heating: an. Additional applications include induction and dielectric heating processes in industrial systems. CB Series. The CB series is the culmination of 45 years of RF plasma and heating experience.

We have taken the proven rugged design of the CX series power amplifier section and combined it with all the innovation in DC supplies and diagnostics to.

Establishments primarily engaged in manufacturing industrial process furnaces, ovens, induction and dielectric heating equipment, and related devices. Establishments primarily engaged in manufacturing bakery ovens are classified in Industry ; those manufacturing cement, wood, and chemical kilns.

Book Description. Radio-Frequency Heating in Food Processing: Principles and Applications covers the fundamentals of radio-frequency (RF) heating and the use of RF-heating technologies in modern food processing, preservation, and related industries. Focusing on industrial and lab-scale applications where RF heating has been employed successfully or reported to have.

Among publications on the application of microwaves for drying purposes there is a group of works about dielectric heating in industrial processes. Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy induction heater consists of an electromagnet and an electronic oscillator that passes a high-frequency alternating current (AC) through the electromagnet.

The rapidly alternating magnetic field penetrates the. Dielectric heating, including microwave and radio-frequency (RF) energy, generates heat volumetrically throughout a food product rather than relying on the heat conduction, and thus offers the potential for quickly heating solid and semisolid foods.

Microwave dielectric heating was firstly reported on the use in organic chemistry by Gedye (Gedye, R. et al., ) and Giguere/Majetich (Giguere, R. et al., ) in the r, it takes a long time before the wide application of this. The last theoretical paragraph deals with the peculiarities of microwave heating and the main elements of a microwave installation (magnetron, waveguide and resonant cavity).

In the second part of the chapter are described the main industrial processes based on high frequency and microwave heating. And also with induction heating and dielectric heating. Along with this heating we saw central heating, electric heating, space heating and immerision type heating.

This heating is done for the quick process of the daily needful things. These heating systems are .Radio-frequency welding, also known as dielectric welding and high-frequency welding, is a plastic welding process that utilizes high-frequency electric fields to induce heating and melting of thermoplastic base materials.

The electric field is applied by a pair of electrodes after the parts being joined are clamped together. The clamping force is maintained until the joint solidifies.