ELECTRICAL HEATING METHODS
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seminar surveyer
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22-12-2010, 01:09 PM


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SHASHI KUMAR .K


.pptx   ELECTRICAL HEATING METHODS.pptx (Size: 209.72 KB / Downloads: 236)



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.

DOMESTIC APPLICATIONOF ELECTRICAL 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

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.

  CLASSIFICATION OF ELECTRICAL HEATING


Power Frequency heating
Resistance heating
Direct Resistance heating
Induction heating
Indirect Resistance heating
induction heating
Arc heating
Direct Arc heating
Indirect Arc heating


High Frequency heating
1. Induction heating
a. Direct Core type
b. Core less type
2. Dielectric heating
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.

1. DIREDCT RESISTANCE HEATING
2. INDIRECT RESISTANCE HEATING
CAUSES OF FAILURE OF HEATING ELEMENTS
Formation of hot spots.
Oxidation
Corrosion
Mechanical failure

DIELECTRIC HEATING
APPLICATION OF DIELECTRIC HEATING
Plywood Industry
Sand Core Baking
Plastic Industry
Tobacco Industry
Bakeries
Electronic Sawing
Dehydration of food
Electro medical application
Book Binding

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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heateroutlet
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18-03-2011, 10:46 AM

This is such a great resource that you are providing and you give it away for free. I love seeing websites that understand the value of providing a quality resource for free.
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