A can be alternative power sources. When compare

A Thermoelectric power generator
is a solid state device that provides direct energy conversion from thermal
energy (heat) into electrical energy based on “Seebeck effect”. The
thermoelectric power cycle, with charge carriers serving as the working fluid,
follows the fundamental laws of thermodynamics and intimately resembles the
power cycle of a conventional heat engine. Advantages of Thermoelectric power
generators over other technologies.

They are extremely
reliable and they have no mechanical moving parts and require considerably
less maintenance. 

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They have very small
size and weightless.

They have the capacity
to operating at elevated temperatures.

 The source for the power generation is
Heat not Light, so day and night operation is possible.

 They are mostly used for convert the
waste heat so it is considered as a Green Technology.

 We can increase the overall efficiency of
the system (4% to·
&7%). 

They can be alternative
power sources.

When compare to existing conventional power system it
require less space and cost Less operating cost.

 
The Drawback of thermoelectric power generator is
their relatively low conversion efficiency (typically ~5%) and Less power
output. Application over the past decade included industrial instruments,
military, medical and aerospace and home reason and applications for portable
or remote power generation. Though, in recent years, an increasing anxiety of
environmental issues of emissions, in particular global warming has resulted in
extensive research into nonconventional technologies of generating electrical
power. Thermoelectric power generation offers a promising technology in the
direct conversion of low-grade thermal energy, such as waste heat energy,
into electrical power.

The basic theory behind this TEG
is “seebeck effect”. Seebeck effect was discovered by Thomas Seebeck
in 1821. When a temperature difference is recognized between the hot and cold
junctions of two dissimilar materials (metals or semiconductors) a voltage is
generated, this voltage is called Seebeck voltage. Indeed this phenomenon is
applied to thermocouples that are extensively used for temperature
measurements. When a Thermoelectric material (Thermoelectric Module or
Thermocouple) held in-between temperature gradient it generates some voltage.
In fact,
this phenomenon is applied to thermocouples that are extensively used for
temperature measurements. Base on this Seebeck effect, thermoelectric devices
can act as electrical power generators. Fig.1  and Fig.2 shows Thermoelectric plate and
Bloch diagram of Sebeck Effect respectively.

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