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Foundations of Electroheat : A Unified Approach, by A. C. Metaxas
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Foundations of Electroheat unifies an extremely diverse area of electricity utilisation in a coherent and concise reference. From laser welding to plasma furnaces for waste treatment and induction heating for forging to radio frequency drying textiles, the various topics that comprise electroheat are presented as a whole. The unified approach concentrates on three major themes:
* Electromagnetic heating, embracing direct resistance, induction heating of metals and radio frequency and microwave heating of dielectrics
* The ionised state, dealing with laser processing, plasma torches and furnaces, glow discharges for nitriding and arc furnaces for melting scrap
* Heat and mass transfer
The impact of computers on electrotechnology is explored by considering topics such as expert systems, neural networks and computational electromagnetics. Featuring industrial applications and case studies, as well as worked examples of the principles involved, this text is essential reading for the engineering student of electroheat. Professional engineers, scientists and technologists interested in the efficient utilisation of electrical energy will also find this an invaluable reference.
- Sales Rank: #1901065 in Books
- Published on: 1996-07-11
- Original language: English
- Number of items: 1
- Dimensions: 9.72" h x 1.46" w x 6.83" l, 2.04 pounds
- Binding: Hardcover
- 530 pages
From the Publisher
Electroheat is an extremely diverse subject area comprising many topics from laser welding to plasma furnaces for waste through induction heat for forging to radio frequency drying of textiles. The text encompasses three major areas: electromagnetic heating, comprising direct resistance and induction heating of metals, radio frequency, and microwave heating of dielectrics. It features a detailed explanation of the elements of ionised states, in particular, laser processing, plasma torches and furnaces, glow discharges for nitriding and arc furnaces for melting scrap, and heat and mass transfer which engulfs most areas of electroheat. The text surveys electromagnetic heating and melting, detailing applicators and sources for electromagnetic heating, the ionised state in electroheat, heat and mass transfer, computational techniques in electrotechnology, and industrial applications.
From the Back Cover
Foundations of Electroheat unifies an extremely diverse area of electricity utilisation in a coherent and concise reference. From laser welding to plasma furnaces for waste treatment and induction heating for forging to radio frequency drying textiles, the various topics that comprise electroheat are presented as a whole. The unified approach concentrates on three major themes:
- Electromagnetic heating, embracing direct resistance, induction heating of metals and radio frequency and microwave heating of dielectrics
- The ionised state, dealing with laser processing, plasma torches and furnaces, glow discharges for nitriding and arc furnaces for melting scrap
- Heat and mass transfer
Most helpful customer reviews
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A book on Electroheat - Worth a place on your desk
By ARTHUR HOLLAND
If you are interested in the many ways of delivering electroheat this book is well worth a place on your desk. It is based on courses on electroheat given in the engineering dept of Cambridge University UK where Metaxas is a Fellow of St John's College. Here he combines mathematical treatment of the principles of electroheat with descriptions and sketches of a wide variety of industrial applications. He graciously acknowledges his debt to the many colleagues who have devoted their careers to the subject and quotes sources both in the text then in a reference list covering five pages in section 9.11.
This book is rich in graphs, illustrations and diagrams of processes. These are all black and white, clear, concise and free from the kind of costly artistic glitz that often preempts substance.
Metaxas provides a searching analytical treatment of the modes of heat generation and distribution in various materials when subjected to electromagnetic fields. The materials can be conductors, insulators or anything in between. He demonstrates that one compact mathematics and physics toolbox can bring understanding and an ability to handle a diverse range of applications. This is what brings "Unified Approach" into the title.
In the section on properties of materials Metaxas begins " The prime purpose of utilizing electrical energy in the processes considered in this book is either to elevate the temperature to effect annealing, curing, sterilizing or melting, to supply the necessary energy for drying as in dielectric or infra-red heating techniques, to provide sufficient energy for welding or cutting materials or to promote plasmas for a number of important industrial applications."
He describes and gives values for the properties of materials relevant to the heating process. These include electrical and thermal conductivity, specific heat, permittivity, dielectric loss, their dependence on temperature.
He shows many worked examples and calculations of induction heating in metals and dielectric heating in non-metals.
There is a section on applicators for electromagnetic heating. This includes:
Clamps for connecting ac power directly onto a metal rod for ohmic ( I�R ) heating.
The three-phase immersed electrode set up for ohmic heating in an electrode boiler or molten glass tank.
Various shapes of copper coils for induction heating of metal, covering parts and continuous profile.
Magnetic yoke designs for transverse flux, improving electromagnetic coupling for thin strip.
Parallel plate arrangements for applying HF electric fields to lossy dielectric materials.
Clamping applicators for HF welding of PVC.
Microwave traveling wave applicator for sheet material.
Microwave horn applicator for heating material in a conveyer tunnel.
This same section covers power sources downstream of the 50 or 60Hz public
supply. This section concerns conversion and control, stopping short of automatic feedback control. A book on control that complements this one is waiting for an author.
The silicon controlled rectifier (SCR) is shown, first as a simple modulator of ac power, then as a controller of the rectifier providing the high-voltage dc supply to a magnetron, then as a rectifier/inverter circuit for delivering medium frequency power to induction heaters.
50 and 60Hz three-phase transformers in saturated-core mode are featured, connected as frequency triplers.
Thermionic tube and solid-state amplifying and switching devices are shown in various oscillator circuits.
For microwave power generation the magnetron is described in some detail, along with its high voltage dc supplies.
Chapter 5 covers the ionized state of a plasma; described by Metaxas as "a state of gaseous material which contains a fair number of ionized particles resulting from the application of an external energy source"....... "may be in the form of dc or ac voltages of frequencies up to the microwave region and beyond"
Three regions of the plasma's voltage/current curve are defined, with their relevance to industrial processing:
Normal glow - about 0.1 to some 50mA, being energy sources for the CO2 laser, plasma chemistry and surface treatments, e.g. etching, assisted chemical and physical vapor depositions, ion implantation, oxidation and sputtering.
Abnormal glow - about 0.5 to 50A; glow discharge carburising and nitriding for surface treatment such as case hardening of ferrous and other components.
Arc discharge - about 1 to 10000A; Energy source for the Nd:YAG and Ruby lasers; plasma chemistry; plasma arc for cutting, welding or spraying; plasma furnaces; arc furnaces for metal melting; arc welding.
A detailed treatment with diagrams and circuits follows, covering lasers, arcs and electron beams.
Chapter 6 covers heat pumps and energy recovery, infra-red heating, air knife technology, induction applications, electrochemical processes, UV curing and ovens and furnaces.
Chapter 7 deals with heat and mass transfer.
Chapter 8 describes the use of computers and numerical techniques in electroheat calculations and processing. Computer developments in this area emerge faster than new book editions come out so you might want to search for new work from this author.
Some 70 pages of industrial applications and case studies follow, then ten appendices on mathematical topics and material properties.
The author index covers six pages and the subject index covers sixteen.
For me the strength of this book is in the variety of industrially proven techniques revealed and explained for the benefit of the processor and process developer.
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