1. WELCOME
.

2. .
ELECTRO TECHNOLOGY-II SEMINAR
“ELECTRIC HEATING AND HEATING METHODS”
TEACHER-IN-CHARGE: DR BARNALI GOSWAMI
KUMARI NUTAN SINGH
PRESENTED BY-
DEEPJYOTI PATOWARY (170610102021)
BIDYUT KALITA (170610702005)
JITUMONI KUMAR (170610002023)
RUBUL PHUKON (180650002010)
SANJIB KUMAR SHAH (170610002043)
SAZID AHMED ZADID (170610002048)
(BE 4th SEMESTER, MECHANICAL ENGINEERING DEPARTMENT)

3. CONTENT
 INTRODUCTION
 PROCESS DESCRIPTION WITH CLASSIFICATION
 IMPACT OF THE TECHNOLOGY ON SOCIETY AND ENVIRONMENT
 USAGE IN THE INDUSTRY AND DAY-TO-DAY LIFE
 LATEST TECHNICAL INSTRUMENTS USED
 CONCLUSION
 REFERENCES

4. INTRODUCTION
Electric heating is a process in which electrical energy
is converted to heat energy.
 It works on the principle of Joule’s heating. i.e.,
H=(I^2)RT ; where I=current flowing in Amp, R=
resistance in Ohm, T= time taken for producing heat;
H= total heat produced.
Electric Heating plays an important role in industrial
and domestic purposes.

5. CLASSIFICATION OF ELECTRIC HEATING
 Power Frequency Heating
Resistance heating
o Direct resistance heating
o Indirect resistance heating
Arc heating
o Direct arc heating
o Indirect arc heating
 High Frequency Heating
Induction heating
o Direct core type
o Core less type
Dielectric heating

6.  POWER FREQUENCY HEATING
In this method, electrical power is directly utilised to
heat substance i.e., standard frequency of the power
supply is used to heat the substance.
 RESISTANCE HEATING
In these method heating is done using the Ohmic
loss in a highly resistive heating element. Ohmic
losses cause the conversion of electrical energy into
heat. This may be direct or indirect.

7. .
 Direct Resistance Heating
In direct resistance heating, the substance to be heated is the
heating element itself. The flow of current offers a stirring action.
 Indirect Resistance Heating
In indirect resistance heating, heat is conducted and radiated
from the heating element to the substance to be heated.

8.  ARC HEATING
 Arc heating utilizes the energy of electric arc to heat
substances.
 In direct arc heating, the substance to be heated acts as an
electrode for the formation of arc and is heated through
direct contact with the arc.
 In indirect arc heating, heat is radiated from the arc
between two sets of electrodes to the heating substance.
Fig- Direct Arc Heating Fig- Indirect Arc Heating

9.  HIGH FREQUENCY HEATING
It is a thermal process of heating , which is used to
eliminate microorganisms. This provide the rapid and uniform
heat distribution and therefore minimize quality reduction of
products.
TYPES OF HIGH FREQUENCY HEATING:
1) Induction heating
a) Direct core types
b) Core less type
2) Dielectric heating

10.  INDUCTION HEATING
 It is heating of electrical conducting object generally
metals by electromagnetic induction.
 Eddy current are generated within metal and due to
resistance of object lead to joule heating of metals.
Fig- Induction Heating

11. . Direct Core Type: The direct core furnace is essentially a transformer in
which charge to be heated forms the secondary this is designed for low
frequency.
 Core Less Type: No core is provided to core less induction furnace. A
crucible of more convenient shape can be employed. For coreless induction
furnace power is obtained from ordinary supply system and its frequency is
converted to the higher value by means of oscillators.
Fig: Direct Core Type Fig: Core Less Type

12.  DIELECTRIC HEATING
 It is also is also known as electronic heating.
 Radio frequency heating, and high-frequency heating, is
the process in which a radio frequency (RF) alternating
electric field, or radio wave or microwave electromagnetic
radiation heats a dielectric material.
 Dielectric polarized by an applied electric field, when a
dielectric is placed in an electric field.
Fig: Dielectric Heating

13. USES IN INDUSTRY AND DAY-TO-DAY LIFE
Domestic uses-
 Room heaters for heating building.
 Immersion heater for water building.
 Hot plates for cooking.
 Electric oven for baking products.
 Electric iron.
 Electric toasters.
Industrial uses-
 Melting of metals.
 Electric welding.
 Moulding of glass for making glass appliances.
 Heat treatment of pointed surpasses.
 Making of plywood.

14. IMPACT OF TECHNOLOGY ON SOCIETY AND
ENVIRONMENT
 Electro-heat technologies often have a low initial investment
cost and also have high power density, they are also compact
installations relative to their production capacity.
 The energy required to produce heat with electricity does not
pollute the air of the heated room as a result a healthier indoor
environment
 Main advantages impact on Environment-
 Cleanliness
 Absence of flue gases
 Ease of Control
 Special heating requirements
 Higher efficiency

15. LATEST TECHNICAL INSTRUMENTS
Neturen's DH technology in direct resistance heating
enables rapid heating of materials.
The fire-tube design in heat exchanger enhances its life by
allowing the tubes to flex.
Vertex water heater is a conventional gas water heater that
has an improved design and lower manufacturing costs.
Heat trace is an electrical system used to maintain or raise
the temperature of pipes and vessels.

16. CONCLUSION
The technical seminar topic discussed here is “Electric
Heating and Heating Methods” which is done through
conduction, convection and radiation ways. Under these types
of heating we discussed resistance, arc and induction heating
with direct and indirect heating processes and also studied on
dielectric heating.
Electric heating is done for the quick process of the daily
needful things. These heating systems are used domestic as
well as in industrial purposes.

17. REFERENCES
1. https://energypedia.info/wiki/Industrial_Electrical_Heating:_
Technologies_and_Advantages
2. https://www.stelpro.com/en-CA/electrical-heating-and-
environment
3. https://evergreenhomeheatingandenergy.com/blog/146142
4. Utilization of Electric Energy- E. Openshaw Taylor.
5. A Text Book of Electrical Technology by B.L. Theraja

18. THANK
YOU
.