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A System of Wearable Electronic Heaters to Provide Bodily Temperature Control for MEEN 475: MATERIALS IN DESIGN
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TAMU MEEN 475 CAES Term Project Presentation
The methodology and results in performing materials selection for a small-scale adiabatic Compressed Air Energy Storage system.
ASM 2013 Fluxtrol Presentation - Enhancing Inductor Coil Reliability
http://fluxtrol.com
In induction hardening, thermal fatigue is one of the main failure modes of induction heating coils. There have been papers published that describe this failure mode and others that describe some good design practices [1-3]. The variables previously identified as the sources of thermal fatigue include radiation from the part surface, frequency, current, concentrator losses, water pressure and coil wall thickness. However, there is very little quantitative data on the factors that influence thermal fatigue in induction coils available in the public domain. By using finite element analysis software this study analyzes the effect of common design variables of inductor cooling, and quantifies the relative importance of these variables. A comprehensive case study for a single shot induction coil with Fluxtrol A concentrator applied is used for the analysis.
On the effects of advanced end-winding cooling on the design and performance ...
For citing this work:
V. Madonna, P. Giangrande, A. Walker and M. Galea, "On the Effects of Advanced End-Winding Cooling on the Design and Performance of Electrical Machines," 2018 XIII International Conference on Electrical Machines (ICEM), Alexandroupoli, 2018, pp. 311-317.
Abstract:
High performance and reliable electrical machines
are often required in modern applications and an appropriate
thermal management allows to fulfil such demand. Thermal
management is crucial for improving performance, reducing size
and preserving the insulation lifetime of electrical machines.
From this prospective, a novel cooling method for machine
end-windings is proposed in the present work. Its cooling action
focuses on the end-windings, since they are commonly identified
as the machine hot-spot. The effectiveness of the proposed
cooling method is experimentally proved and the improvement,
in terms of current density, for a given wire insulation thermal
class, is quantified.
A previously designed permanent magnet synchronous
machine, implementing a traditional housing water jacket, is
used as a case study. The influence of the improved current
density on machine torque density is investigated, through finite
element simulations, when the proposed cooling method is
integrated to the existing housing water jacket.
IRJET- Integration of Phase Change Material in Helmets
1) The document proposes integrating phase change material (PCM) into helmets to provide cooling for riders. PCM absorbs and releases a large amount of heat during its phase change, providing a cooling effect.
2) Calculations show that 0.4kg of PCM placed in pouches inside the helmet and sandwiched between cushioning layers can provide over 1.5 hours of cooling for a rider's head on a hot day.
3) During testing with an ambient temperature of 39°C, the cooling effect from the PCM in the helmet design lasted over 2 hours, demonstrating its potential to increase comfort and safety by encouraging more helmet use.
Steady state thermal analysis of a 4-stroke single
This document summarizes a steady state thermal analysis of fins on a single cylinder internal combustion engine. The analysis evaluated different fin geometries (curved vs rectangular), materials (grey cast iron, aluminum alloy 6061, aluminum alloy 6060), and their impact on surface temperature and heat flux through natural convection cooling over 10 seconds. The results showed that rectangular fins made of aluminum alloy 6060 achieved the highest average temperature of 294.34°C and heat flux of 139071 W/m2, making it the most efficient configuration for cooling the engine.
Induction Heating Fundamentals
Learn about how induction heating works in industrial manufacturing processes. Induction can be used for brazing, soldering, heat treating, melting, forging and much more.
MODELING AND OPTIMIZATION OF COLD CRUCIBLE FURNACES FOR MELTING METALS
http://fluxtrol.com
Cold Crucible Furnaces (CCFs), widely used in multiple special applications of
melting metals, oxides, glasses and other materials [1], are essentially 3D devices and their
modeling is a complicated task. Multiple studies of CCFs have been made for their
optimization, but their electrical efficiency is still low; for metals approximately 25-30% and
even lower. Fluxtrol, Inc., made an extensive study of electromagnetic processes of CCFs
using computer simulation and laboratory tests. This study showed that electrical efficiency of
CCFs may be strongly improved by means of optimal design of the whole system with use of
magnetic flux controllers. Theoretical results had been confirmed by laboratory tests on
mockups and by industrial tests with real melting processes. The presentation contains a
description of the computer modeling procedure and major findings. They form a basis for
optimal design of electromagnetic systems of CCFs.
SIMULATION OF INDUCTION SYSTEM FOR BRAZING OF SQUIRREL CAGE ROTOR
http://fluxtrol.com
ABSTRACT. Induction heating is the most progressive method for brazing of squirrel cage (SC) type rotors of electric motors. Frequencies from 3 to 10 kHz are typically being used for brazing of relatively large rotors (diameter more than 200 mm). If the ring thickness exceeds its height, flat single or two-turn inductors with concentrator are located under the ring instead of the round coil surrounding the ring. The rotor is standing on the top of the coil providing high pressure onto the joint components; a gap between the coil and ring is minimal and constant during the heating process.
This study describes a modified system with concentrator made of magnetic composite Fluxtrol 100. Frequency was much higher (around 50 kHz) than traditionally used (3-10 kHz). Electromagnetic and thermal coupled simulation with Flux 2D used to compare the process parameters and temperature distribution dynamics at 3 and 50 kHz. It was found that at higher frequency the brazing quality and time are approximately the same as at lower frequency. Electrical efficiency is slightly higher at 50 kHz while the coil current is significantly lower. Computer simulation at different powers showed that for a larger rotor the minimum required power is 70-75 kW. At lower power brazing time quickly increases and at 50 kW reaches 16 min instead of 5 min at 75 kW. Electrodynamic forces between the coil and rotor at 75 kW equal to 250 N at 50 kHz and almost 950 N at 3 kHz.
Thermal simulation of the coil proved that the maximum temperature of Fluxtrol 100 concentrator is below 200 C, which is acceptable for this material. Experimental and then industrial tests confirmed the results of simulation.
Recommended
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The methodology and results in performing materials selection for a small-scale adiabatic Compressed Air Energy Storage system.
ASM 2013 Fluxtrol Presentation - Enhancing Inductor Coil Reliability
http://fluxtrol.com
In induction hardening, thermal fatigue is one of the main failure modes of induction heating coils. There have been papers published that describe this failure mode and others that describe some good design practices [1-3]. The variables previously identified as the sources of thermal fatigue include radiation from the part surface, frequency, current, concentrator losses, water pressure and coil wall thickness. However, there is very little quantitative data on the factors that influence thermal fatigue in induction coils available in the public domain. By using finite element analysis software this study analyzes the effect of common design variables of inductor cooling, and quantifies the relative importance of these variables. A comprehensive case study for a single shot induction coil with Fluxtrol A concentrator applied is used for the analysis.
On the effects of advanced end-winding cooling on the design and performance ...
For citing this work:
V. Madonna, P. Giangrande, A. Walker and M. Galea, "On the Effects of Advanced End-Winding Cooling on the Design and Performance of Electrical Machines," 2018 XIII International Conference on Electrical Machines (ICEM), Alexandroupoli, 2018, pp. 311-317.
Abstract:
High performance and reliable electrical machines
are often required in modern applications and an appropriate
thermal management allows to fulfil such demand. Thermal
management is crucial for improving performance, reducing size
and preserving the insulation lifetime of electrical machines.
From this prospective, a novel cooling method for machine
end-windings is proposed in the present work. Its cooling action
focuses on the end-windings, since they are commonly identified
as the machine hot-spot. The effectiveness of the proposed
cooling method is experimentally proved and the improvement,
in terms of current density, for a given wire insulation thermal
class, is quantified.
A previously designed permanent magnet synchronous
machine, implementing a traditional housing water jacket, is
used as a case study. The influence of the improved current
density on machine torque density is investigated, through finite
element simulations, when the proposed cooling method is
integrated to the existing housing water jacket.
IRJET- Integration of Phase Change Material in Helmets
1) The document proposes integrating phase change material (PCM) into helmets to provide cooling for riders. PCM absorbs and releases a large amount of heat during its phase change, providing a cooling effect.
2) Calculations show that 0.4kg of PCM placed in pouches inside the helmet and sandwiched between cushioning layers can provide over 1.5 hours of cooling for a rider's head on a hot day.
3) During testing with an ambient temperature of 39°C, the cooling effect from the PCM in the helmet design lasted over 2 hours, demonstrating its potential to increase comfort and safety by encouraging more helmet use.
Steady state thermal analysis of a 4-stroke single
This document summarizes a steady state thermal analysis of fins on a single cylinder internal combustion engine. The analysis evaluated different fin geometries (curved vs rectangular), materials (grey cast iron, aluminum alloy 6061, aluminum alloy 6060), and their impact on surface temperature and heat flux through natural convection cooling over 10 seconds. The results showed that rectangular fins made of aluminum alloy 6060 achieved the highest average temperature of 294.34°C and heat flux of 139071 W/m2, making it the most efficient configuration for cooling the engine.
Induction Heating Fundamentals
Learn about how induction heating works in industrial manufacturing processes. Induction can be used for brazing, soldering, heat treating, melting, forging and much more.
MODELING AND OPTIMIZATION OF COLD CRUCIBLE FURNACES FOR MELTING METALS
http://fluxtrol.com
Cold Crucible Furnaces (CCFs), widely used in multiple special applications of
melting metals, oxides, glasses and other materials [1], are essentially 3D devices and their
modeling is a complicated task. Multiple studies of CCFs have been made for their
optimization, but their electrical efficiency is still low; for metals approximately 25-30% and
even lower. Fluxtrol, Inc., made an extensive study of electromagnetic processes of CCFs
using computer simulation and laboratory tests. This study showed that electrical efficiency of
CCFs may be strongly improved by means of optimal design of the whole system with use of
magnetic flux controllers. Theoretical results had been confirmed by laboratory tests on
mockups and by industrial tests with real melting processes. The presentation contains a
description of the computer modeling procedure and major findings. They form a basis for
optimal design of electromagnetic systems of CCFs.
SIMULATION OF INDUCTION SYSTEM FOR BRAZING OF SQUIRREL CAGE ROTOR
http://fluxtrol.com
ABSTRACT. Induction heating is the most progressive method for brazing of squirrel cage (SC) type rotors of electric motors. Frequencies from 3 to 10 kHz are typically being used for brazing of relatively large rotors (diameter more than 200 mm). If the ring thickness exceeds its height, flat single or two-turn inductors with concentrator are located under the ring instead of the round coil surrounding the ring. The rotor is standing on the top of the coil providing high pressure onto the joint components; a gap between the coil and ring is minimal and constant during the heating process.
This study describes a modified system with concentrator made of magnetic composite Fluxtrol 100. Frequency was much higher (around 50 kHz) than traditionally used (3-10 kHz). Electromagnetic and thermal coupled simulation with Flux 2D used to compare the process parameters and temperature distribution dynamics at 3 and 50 kHz. It was found that at higher frequency the brazing quality and time are approximately the same as at lower frequency. Electrical efficiency is slightly higher at 50 kHz while the coil current is significantly lower. Computer simulation at different powers showed that for a larger rotor the minimum required power is 70-75 kW. At lower power brazing time quickly increases and at 50 kW reaches 16 min instead of 5 min at 75 kW. Electrodynamic forces between the coil and rotor at 75 kW equal to 250 N at 50 kHz and almost 950 N at 3 kHz.
Thermal simulation of the coil proved that the maximum temperature of Fluxtrol 100 concentrator is below 200 C, which is acceptable for this material. Experimental and then industrial tests confirmed the results of simulation.
Quiz 2 (thermo)
The document discusses three thermodynamic systems problems: (1) calculating the power requirement for a steam boiler, (2) determining the available energy from a falling stone into a tank of water, and (3) using the ideal gas law to calculate the mass and new temperature of carbon dioxide gas when its pressure and volume change.
Magnetic Flux Controllers in Induction Heating and Melting by Robert Goldstei...
MAGNETIC FLUX CONTROLLERS are
materials other than the copper coil that are used
in induction systems to alter the flow of the magnetic
field. Magnetic flux controllers used in
power supplying components are not considered
in this article.
Magnetic flux controllers have been in existence
since the development of the induction
technique. Michael Faraday used two coils of
wire wrapped around an iron core in his experiments
that led to Faraday’s lawof electromagnetic
induction, which states that the electromotive
force (emf) induced in a circuit is directly proportional
to the time rate of change of the magnetic
flux through the circuit. After the development
of the induction principle, magnetic flux controllers,
in the form of stacks of laminated steel, found
widespread use in the development of transformers
for more efficient transmission of energy
(Ref 1, 2).
Magnetic cores gained widespread use in the
transformer industry because they increased
the amount of magnetic flux produced with
the same alternating current. The higher the
magnetic flux, the higher the emf, which results
in an increase in energy transfer efficiency from
the primary winding to the secondary winding.
Similar to transformers, magnetic cores were
used on early furnaces for induction melting
(Ref 1, 2). The benefits of magnetic flux controllers
vary depending on the application. For
induction heating, magnetic flux controllers can
provide favorable and unfavorable paths for magnetic
flux to flow, resulting in increased heating in
desired areas and reduced the heating in undesirable
areas, respectively.Magnetic flux controllers
are not used in every induction heating application,
but their use has increased (Ref 3, 4).
Copyright 2014, ASM International, www.asminternational.org. This article was published in ASM Handbook, Volume 4C: Induction Heating and Heat Treatment and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.
Induction Furnace
This document provides details of the design process for an induction furnace. It begins with introducing the problem and client needs, then provides background research on metal artists. It describes conceptual designs including a functional diagram and morphological chart. Preliminary design details frequency calculations and a proof of concept test. The detailed design section specifies the work coil, water pump, fan, and Arduino control. Test results found issues with the circuit and components shorting initially but were resolved with component upgrades. The document outlines the full process from problem definition to testing solutions.
CH EN 3453 Heat Transfer 2014 Fall Utah Homework HW 05 Assignment
Chemical Engineering CH EN 3453 Heat Transfer
from University of Utah, 2014 Fall
Homework HW 05 Assignment
Induction Heating – Operation, Applications and Case Studies - Presentation S...
The industrial process heating applications that use electrotechnologies have been found to improve product quality, productivity, energy efficiency, reduce energy intensity and have many other non-energy benefits. Induction technology is another electrotechnology based heating method for heating electrical conductive materials. It involves sending an alternating current (AC) through a copper coil which surrounds the material to be heated or melted. When a metal is placed inside the coil and enters the magnetic field, circulating eddy currents are induced within the metal. The resistance of the metal to the flow of the eddy currents causes the metal to heat up. In this webcast, the operation principles of induction heating technology used for both heating and melting, its applications and EPRI case studies will be presented. The information of vendors as well as other links to reference materials will be presented at the end.
Chapter 7: Fluxtrol Induction Heating Case Studies and Success Stories
The document describes several case studies where Fluxtrol helped optimize induction heating processes by developing new induction coil designs and magnetic flux concentrator profiles. In each case, computer simulations identified issues with existing processes, and new coil designs with customized Fluxtrol concentrators achieved more uniform heating and resolved production problems. The optimized solutions improved part quality, increased production rates, and extended coil lifetimes.
Induction heating
Induction heating uses an alternating magnetic field generated by an induction coil to heat electrically conductive materials. The magnetic field induces eddy currents in the material, which generate heat inside the material. Induction heating has several advantages over other heating methods, including contactless heating, selective heating of parts, fast start-up and heating times, and no pollution of the surrounding area. The system consists of a power supply, induction coil, and water cooling unit. Common applications include melting, heat treatment, welding, and forging.
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This document summarizes a computational study on using finned heat pipes to cool photovoltaic (PV) solar panels. The study uses computational fluid dynamics (CFD) to model heat transfer from a solar panel through a heat pipe with attached fins. The CFD analysis shows that attaching fins to a heat pipe can reduce the temperature of a solar panel by up to 20°C compared to no cooling. This temperature reduction can increase the panel's efficiency and power output. The study aims to develop a passive cooling system for PV panels using a low-cost finned heat pipe design.
Induction heat treatment of automotive parts
* Basics of Induction heating and heat treating
* Role and specifics of induction technology in heat treating in automotive parts
* Main processes of induction heat treating of automotive parts
* Computer simulation and optimization of induction processes and heating coils
* Advanced design of induction coils
* Magnetic controllers on induction coils
* Induction coil manufacturing
* Maintenance of induction coils
* Stresses and distortions in the process of induction heating
* Examples of induction heat treating (parts, processes, coils, installations)
* Conclusions
Application Note - Dielectric Heating
This Application Note illustrates the use and advantages of dielectric heating, which as the name implies, is used for materials that are non-conducting. The essential advantage of dielectric heating is that the heat is generated within the material to be heated. In comparison with more conventional heating techniques (hot air, infrared, et cetera) in which the material is heated via the outer surface, dielectric heating is much more rapid. This is because electrical insulating materials, i.e. the domain of dielectric heating, are usually also poor conductors of heat.
Other interesting characteristics of radio frequency and microwave heating are the high power density and the potential for selectively heating materials. However, dielectric heating is a very expensive technique that cannot usually compete in cost terms with techniques such as resistance or infrared heating.
Induction heating applications
The document provides an overview of induction heating applications from EFD Induction. It discusses various industrial heating processes that can be performed using induction heating such as hardening, tempering, brazing, bonding, welding, annealing, pre-heating, post-heating, forging, melting, straightening and plasma cutting. It also briefly describes how induction heating works and the benefits it provides for industrial applications. EFD Induction offers a range of equipment and solutions for different induction heating applications.
NCSUabstract
Low defect density AlGaN/GaN structures are promising for high-power electronic applications but current designs have poor thermal management, reducing performance and reliability. Research aims to maximize thermal conductivity through native substrates with high conductivity and minimizing defect density in materials. Using hydride vapor phase epitaxy with low-temperature interlayers can yield lower defect density at reduced cost. The authors characterized AlGaN grown on GaN substrates using HVPE and found thermal conductivity was highest for low and high aluminum content, while mid-range samples were lower, and their samples had significantly higher conductivity than previous studies due to lower dislocation density.
An Experimental Investigations of Nusselt Number for Low Reynolds Number in a...
This document summarizes an experimental investigation of heat transfer in an agitated vessel with a helical coil. Key points:
- Experiments were conducted with Newtonian and non-Newtonian fluids (sodium carboxymethyl cellulose solutions) at different concentrations, flow rates, and coil lengths.
- Viscosity and heat transfer coefficients were measured and correlations developed to relate Nusselt number to Reynolds number, Prandtl number, and Dean number for Newtonian and non-Newtonian fluids.
- Results show that heat transfer coefficients were higher for non-Newtonian fluids and increased with impeller speed, consistent with improved mixing and turbulence inside the coil.
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This document summarizes a research paper that analyzes the heat transfer characteristics of an induction furnace using finite element analysis. It begins with an introduction to induction heating processes and describes the basic components of an induction furnace. The researchers aim to computationally validate the modified composite wall thickness of an induction furnace using heat transfer analysis. The document reviews several other studies on induction heating simulations and experimental validations. It then outlines the thermal modeling approach using the heat diffusion equation and describes the boundary conditions for the finite element analysis.
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Quiz 2 (thermo)
The document discusses three thermodynamic systems problems: (1) calculating the power requirement for a steam boiler, (2) determining the available energy from a falling stone into a tank of water, and (3) using the ideal gas law to calculate the mass and new temperature of carbon dioxide gas when its pressure and volume change.
Magnetic Flux Controllers in Induction Heating and Melting by Robert Goldstei...
MAGNETIC FLUX CONTROLLERS are
materials other than the copper coil that are used
in induction systems to alter the flow of the magnetic
field. Magnetic flux controllers used in
power supplying components are not considered
in this article.
Magnetic flux controllers have been in existence
since the development of the induction
technique. Michael Faraday used two coils of
wire wrapped around an iron core in his experiments
that led to Faraday’s lawof electromagnetic
induction, which states that the electromotive
force (emf) induced in a circuit is directly proportional
to the time rate of change of the magnetic
flux through the circuit. After the development
of the induction principle, magnetic flux controllers,
in the form of stacks of laminated steel, found
widespread use in the development of transformers
for more efficient transmission of energy
(Ref 1, 2).
Magnetic cores gained widespread use in the
transformer industry because they increased
the amount of magnetic flux produced with
the same alternating current. The higher the
magnetic flux, the higher the emf, which results
in an increase in energy transfer efficiency from
the primary winding to the secondary winding.
Similar to transformers, magnetic cores were
used on early furnaces for induction melting
(Ref 1, 2). The benefits of magnetic flux controllers
vary depending on the application. For
induction heating, magnetic flux controllers can
provide favorable and unfavorable paths for magnetic
flux to flow, resulting in increased heating in
desired areas and reduced the heating in undesirable
areas, respectively.Magnetic flux controllers
are not used in every induction heating application,
but their use has increased (Ref 3, 4).
Copyright 2014, ASM International, www.asminternational.org. This article was published in ASM Handbook, Volume 4C: Induction Heating and Heat Treatment and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.
Induction Furnace
This document provides details of the design process for an induction furnace. It begins with introducing the problem and client needs, then provides background research on metal artists. It describes conceptual designs including a functional diagram and morphological chart. Preliminary design details frequency calculations and a proof of concept test. The detailed design section specifies the work coil, water pump, fan, and Arduino control. Test results found issues with the circuit and components shorting initially but were resolved with component upgrades. The document outlines the full process from problem definition to testing solutions.
CH EN 3453 Heat Transfer 2014 Fall Utah Homework HW 05 Assignment
Chemical Engineering CH EN 3453 Heat Transfer
from University of Utah, 2014 Fall
Homework HW 05 Assignment
Induction Heating – Operation, Applications and Case Studies - Presentation S...
The industrial process heating applications that use electrotechnologies have been found to improve product quality, productivity, energy efficiency, reduce energy intensity and have many other non-energy benefits. Induction technology is another electrotechnology based heating method for heating electrical conductive materials. It involves sending an alternating current (AC) through a copper coil which surrounds the material to be heated or melted. When a metal is placed inside the coil and enters the magnetic field, circulating eddy currents are induced within the metal. The resistance of the metal to the flow of the eddy currents causes the metal to heat up. In this webcast, the operation principles of induction heating technology used for both heating and melting, its applications and EPRI case studies will be presented. The information of vendors as well as other links to reference materials will be presented at the end.
Chapter 7: Fluxtrol Induction Heating Case Studies and Success Stories
The document describes several case studies where Fluxtrol helped optimize induction heating processes by developing new induction coil designs and magnetic flux concentrator profiles. In each case, computer simulations identified issues with existing processes, and new coil designs with customized Fluxtrol concentrators achieved more uniform heating and resolved production problems. The optimized solutions improved part quality, increased production rates, and extended coil lifetimes.
Induction heating
Induction heating uses an alternating magnetic field generated by an induction coil to heat electrically conductive materials. The magnetic field induces eddy currents in the material, which generate heat inside the material. Induction heating has several advantages over other heating methods, including contactless heating, selective heating of parts, fast start-up and heating times, and no pollution of the surrounding area. The system consists of a power supply, induction coil, and water cooling unit. Common applications include melting, heat treatment, welding, and forging.
30120140504026
This document summarizes a computational study on using finned heat pipes to cool photovoltaic (PV) solar panels. The study uses computational fluid dynamics (CFD) to model heat transfer from a solar panel through a heat pipe with attached fins. The CFD analysis shows that attaching fins to a heat pipe can reduce the temperature of a solar panel by up to 20°C compared to no cooling. This temperature reduction can increase the panel's efficiency and power output. The study aims to develop a passive cooling system for PV panels using a low-cost finned heat pipe design.
Induction heat treatment of automotive parts
* Basics of Induction heating and heat treating
* Role and specifics of induction technology in heat treating in automotive parts
* Main processes of induction heat treating of automotive parts
* Computer simulation and optimization of induction processes and heating coils
* Advanced design of induction coils
* Magnetic controllers on induction coils
* Induction coil manufacturing
* Maintenance of induction coils
* Stresses and distortions in the process of induction heating
* Examples of induction heat treating (parts, processes, coils, installations)
* Conclusions
Application Note - Dielectric Heating
This Application Note illustrates the use and advantages of dielectric heating, which as the name implies, is used for materials that are non-conducting. The essential advantage of dielectric heating is that the heat is generated within the material to be heated. In comparison with more conventional heating techniques (hot air, infrared, et cetera) in which the material is heated via the outer surface, dielectric heating is much more rapid. This is because electrical insulating materials, i.e. the domain of dielectric heating, are usually also poor conductors of heat.
Other interesting characteristics of radio frequency and microwave heating are the high power density and the potential for selectively heating materials. However, dielectric heating is a very expensive technique that cannot usually compete in cost terms with techniques such as resistance or infrared heating.
Induction heating applications
The document provides an overview of induction heating applications from EFD Induction. It discusses various industrial heating processes that can be performed using induction heating such as hardening, tempering, brazing, bonding, welding, annealing, pre-heating, post-heating, forging, melting, straightening and plasma cutting. It also briefly describes how induction heating works and the benefits it provides for industrial applications. EFD Induction offers a range of equipment and solutions for different induction heating applications.
NCSUabstract
Low defect density AlGaN/GaN structures are promising for high-power electronic applications but current designs have poor thermal management, reducing performance and reliability. Research aims to maximize thermal conductivity through native substrates with high conductivity and minimizing defect density in materials. Using hydride vapor phase epitaxy with low-temperature interlayers can yield lower defect density at reduced cost. The authors characterized AlGaN grown on GaN substrates using HVPE and found thermal conductivity was highest for low and high aluminum content, while mid-range samples were lower, and their samples had significantly higher conductivity than previous studies due to lower dislocation density.
An Experimental Investigations of Nusselt Number for Low Reynolds Number in a...
This document summarizes an experimental investigation of heat transfer in an agitated vessel with a helical coil. Key points:
- Experiments were conducted with Newtonian and non-Newtonian fluids (sodium carboxymethyl cellulose solutions) at different concentrations, flow rates, and coil lengths.
- Viscosity and heat transfer coefficients were measured and correlations developed to relate Nusselt number to Reynolds number, Prandtl number, and Dean number for Newtonian and non-Newtonian fluids.
- Results show that heat transfer coefficients were higher for non-Newtonian fluids and increased with impeller speed, consistent with improved mixing and turbulence inside the coil.
Introduction to high frequency induction heating by stead fast engineers pvt ltd
Introduction to High Frequency Induction Heating by Stead Fast Engineers Pvt Ltd.find here Induction Furnace manufacturers,
Induction heater manufacturers,
Induction Billet heater Manufacturers,
Induction Melting furnace manufacturers,
Induction Furnace Manufacturers in India,
Induction Billet heater manufacturers in India,
Induction heating system,
Induction Melting Furnace for your sourcing needs.
Dielectric Heating And Arc Furnace
Dielectric heating employs the polarization effect to heat non-metallic materials. When an alternating electric field is applied, the molecules in the material align with the changing field, causing internal heating through molecular friction. The power loss from the lag between the current and voltage applied to a capacitor is used to heat the dielectric medium. The ease of heating depends on the material's loss factor, which represents power dissipation and is dependent on temperature and electric field strength. Dielectric heating has applications in plastic welding, rubber vulcanization, food processing, and more. An electric arc furnace uses an electric arc to melt scrap metal by forming an arc between graphite electrodes and the charged material.
Vishwakarma-MicroEng2015
This document summarizes an experiment to measure the out-of-plane thermal conductivity of flexible substrate materials like polyethylene naphthalate (PEN) and polyethylene teraphthalate (PET). A steady-state method is used where a heat flux is applied through one copper block in contact with the substrate, and the temperature difference across the substrate is measured. Thermal conductivity values are determined from the temperature differences and heat fluxes for substrates of varying thicknesses. The results indicate low thermal conductivity for flexible substrates, which could challenge thermal management in flexible electronics due to limited heat spreading and lack of active cooling options.
INDUCTION HEATING BY HIGH FREQUENCY RESONANT INVERTER
This document provides an overview of induction heating, including its working principle, requirements, and applications. It discusses how induction heating works by generating eddy currents in conductive materials using a high-frequency alternating magnetic field. This causes heating through hysteresis and eddy current losses. Key applications mentioned include induction cooking, welding, brazing, plastic processing, and sealing of food containers.
Seminar On Magnetic Refrigeration
The document summarizes Ganesh Pralhad Bharambe's seminar on magnetic refrigeration presented under the guidance of Prof. A. M. Patil. It discusses the basic principles of magnetic refrigeration, the thermodynamic cycle involved, suitable working materials including developments in materials science, and applications of the technology.
3 finite
This document summarizes a research paper that analyzes the heat transfer characteristics of an induction furnace using finite element analysis. It begins with an introduction to induction heating processes and describes the basic components of an induction furnace. The researchers aim to computationally validate the modified composite wall thickness of an induction furnace using heat transfer analysis. The document reviews several other studies on induction heating simulations and experimental validations. It then outlines the thermal modeling approach using the heat diffusion equation and describes the boundary conditions for the finite element analysis.
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MEEN 475 Final Presentation
- 1. A System of Wearable Electronic Heaters to Provide Bodily Temperature Control Wednesday, December 7th, 2016 MEEN 475 - 502 Samuel Terrill | Matthew Pledger | Andres Barrios | Richard Meeks | Guillermo Villalobos | Kyle Slaton Instructor: Dr. Tanil Ozkan
- 2. Outline Market Need System Overview Material Selection Material Process Selection Auxiliary Part Selection Conclusions
- 3. Introduce system background •For athletes, every training session is essential to improve performance •Missed practices due to cold temperatures can hinder athletic growth •These athletic bands were thus created in order to heat up athletes during winter workouts to prevent unnecessary expenditure of energy
- 4. System Overview Thin bands of silicone rubber with copper wiring embedded circumferentially. Contains a thin battery, small microcontroller, and temperature sensor Bands are scalable for warming critical areas of the human body-near wrists, upper arm, legs, abdomen Added benefit of keeping muscles warm for injury prevention.
- 5. Merit Index Derivation – Resistance Heater
- 6. Ashby Charts ● Young’s Modulus must remain below 150 GPA. ● Electrical resistivity must be minimized. ● Thermal conductivity greater than 100
- 7. AHP Ranking: Thermal conductivity (K) = 2, Elastic Modulus (E) = 3, Thermal Resistivity (𝜌e ) = 4, Density (𝜌) = 5, Cost (C) = 6 Material Score Rank Copper 0.49323 1 Aluminium 0.24353 3 Zinc 0.26325 2
- 8. Manufacturing Process Final Selection: Sheet Forming Final Selection: Injection Molding
- 9. Temperature Sensor Made of graphite and semi-crystalline acrylate polymer formed by 2 monomers Flexible Lightweight Printable Accurate "A Printable, Flexible, Lightweight Temperature Sensor." Phys.org - News and Articles on Science and Technology. N.p., 9 Nov. 2015. Web. 03 Dec. 2016.
- 10. Insulation For insulation, material selection was qualitative Desire higher resistivity for shock prevention Desire medium thermal conductivity for mild insulation but adequate transfer to person
- 11. Thermodynamic Analysis [1] Qin,Device = Wout,activity + Qout,activity + Qout,body [2] Qout,activity + Wout,activity = Metabolic Equivalent of Task (MET) [3] MET = METs × 3.5 × mass ÷ 200 [4] Qout,body = 100 Wh →Qin,device = 365.468 kJ
- 12. Power Source ● Selected CP9V as power source. ● Slightly more expensive than others, but reasonable in bulk. ● Supports the required power as calculated.
- 13. Conclusions Target Market: Athletes and Outdoor Enthusiasts Design: Thin, circular, silicone bands with wiring Components: Thin battery, temperature sensor, and small microcontroller Merit Indices: Ashby method and industry research nominated silicone rubber for the bands AHP Method nominated copper as final product for electrical wiring
- 14. Questions?
Editor's Notes
- Sam