electrical heating methods
TRANSCRIPT
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A PRESENTATION ON
ELECTRICAL HEATING METHODS
Submitted by: -
SHASHI KUMAR .KREG. NO: - 446EE08036
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CONTENTS
INTRODUCTION
INDUSTRIAL & DOMESTIC APPLICATIONS
CLASSIFICATION OF ELECTRICAL HEATING METHODS
RESITANCE HEATING METHODS
DIELECTRIC HEATING
APPLICATIONS OF DIELECTRIC HEATING
CAUSES OF FAILUR OF HEATING ELEMENTS
ADVANTAGES OF ELECTRICAL HEATING OVER OTHER
HEATING METHODS
CONCLUSION
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INTRODUCTION
Electrical heating is based on the principle of that
when electric current passes through a medium
heat is produced. Let us take the case of solid
material which as resistance ‘R’ ohms and current
flowing through it is I amps for ‘t’ seconds than heat
produced in the material will be H=I²Rt Joules.
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DOMESTIC APPLICATIONOFELECTRICAL HEATING
Room heater for heating the building
Immersion heater for water heating
Hot plates for cooking
Geysers
Electric kettles
Electric Iron
Electric oven for baking products
Electric toasters
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INDUSTRIAL APPLICATION
Melting of metals
Electric welding
Mould ling of glass for making glass appliances
Baking of insulator
Mould ling of plastic components
Heat treatment of pointed surpasses
Making of plywood.
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CLASSIFICATION OF ELECTRICAL
HEATING
Power Frequency heating High Frequency heating
1. Resistance heating 1. Induction heating
a. Direct Resistance heating a. Direct Core type Induction heating
b. Indirect Resistance heating b. Core less type induction heating
2. Arc heating 2. Dielectric heating
a. Direct Arc heating
b. Indirect Arc heating
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RESISTANCE HEATING
This method is based upon the I²R loss.
Whenever current is passed through a
resistor material heat is produced because
of I²R losses.
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1. DIRECT RESISTANCE HEATING
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2. INDIRECT RESISTANCE HEATING
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CAUSES OF FAILURE OF HEATING ELEMENTS
Formation of hot spots.
Oxidation
Corrosion
Mechanical failure
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DIELECTRIC HEATING
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APPLICATION OF DIELECTRIC HEATING
Plywood Industry
Sand Core Baking
Plastic Industry
Tobacco Industry
Bakeries
Electronic Sawing
Dehydration of food
Electro medical application
Book Binding
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ADVANTAGES OF ELECTRICAL HEATING OVER OTHER METHOD OF HEATING
• Clean and atmosphere
• No pollution
• Controlled temperature
• Localized application
• Uniform heating
• Highest efficiency of utilization
• Cheap furnaces
• Mobility of job
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CONCLUSION
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