In this work the expression of the
performance coefficient of Peltier’s thermo electrical refrigeration is established. The
examination of its optimisation is conducted according to its different
parameters.Thermoelectric cooling is based on two effects:
the Seebeck and the Peltier. The former has its application in thermo batteries,
while the latter has its own in refrigerators and
heat pumps. An understanding
of both effects is based on thermodynamics and the physics of solid.
The Peltier
effect has a very wide range of
application, amongst which can be cited heat pumps and thermoelectric coolers.
The latter offers an invaluable advantage, in comparison with conventional
refrigerators. First of all, they do not use gas which is a source of air pollution,
and secondly they work with low intensity energy.This study reveals that the
coefficient of performance and the power of the thermocouple depend on the
length ℓ of the semi-conductors. The practical module tends toward the
ideal one when this length becomes too long. For economic reasons, the
optimisation of COP shall not be based on this parameter. Elsewhere, the unavoidable
effects of electric and thermic
contacts being responsible for a
reduction in
COP, another way out lies in mastery of the n, r and ℓc parameters
which control these contacts, as their reduction results in a considerable
amelioration of the coefficient of performance.www.acadjournal.com : Volume 20, 2007
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