Chapter: Electric Energy Generation and Utilisation and Conservation - Industrial Heating and Welding

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Role electric heating for industrial applications

When current is passed through a conductor, the conductor becomes hot. When a magnetic material is brought in the vicinity of an alternating magnetic field, heat is produced in the magnetic material.

Role electric heating for industrial applications:

 When current is passed through a conductor, the conductor becomes hot. When a magnetic material is brought in the vicinity of an alternating magnetic field, heat is produced in the magnetic material.

 

 Similarly it was found that when an electrically insulating material was subjected to electrical stresses, it too underwent a temperature rise (Dielectric heating).

 

 There are various method of heating a material but electric heating is considered  to be far superior for the following reasons:

 

(i)Cleanliness:

 

 Due to complete elimination of dust and ash, the charges to maintain cleanliness are minimum and the material to be heated does not get contaminated.

 

(ii)Ease of control:

 

 With the help of manual or automatic devices, it is possible to control and regulate the temperature of a furnace with great ease.

 

(iii)Uniform heating:

 

 Whereas in other forms of heating a temperature gradient is set up from the outer surface (iv) Low attention and maintenance cost:

 

 Electric  heating  equipments  normally do  not  require  much  attention  and  maintenance  is  also negligible.

 Hence labour charges on these items are negligibly small as compared to alternative methods of heating.

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