Effect of heat transfer on the performance of a thermoelectric heat pump driven by a thermoelectric generator

Lingen Chen. , Fankai Meng. , Fengrui Sun.

Abstract


A model of a thermoelectric heat pump driven by a thermoelectric generator
with external heat transfer irreversibility is proposed. The performance of
the combined thermoelectric heat pump device obeying Newton's heat transfer
law is analyzed using the combination of finite time thermodynamics and
non-equilibrium thermodynamics. Two analytical formulae for heating load
versus working electrical current, and the coefficient of performance (COP)
versus working electrical current, are derived. For a fixed total heat
transfer surface area of four heat exchangers, the allocations of the heat
transfer surface area among the four heat exchangers are optimized for
maximizing the heating load and the COP of the combined thermoelectric heat
pump device. For a fixed total number of thermoelectric elements, the ratio
of the number of thermoelectric elements of the generator to the total number of
thermoelectric elements is also optimized for maximizing both the heating
load and the COP of the combined thermoelectric heat pump device. The
influences of thermoelectric element allocation and heat transfer area
allocation are analyzed by detailed numerical examples. The optimum working
electrical currents for maximum heating load and maximum COP at different
total numbers of thermoelectric elements and different total heat transfer
areas are provided, respectively.

Keywords


Combined thermoelectric device; thermoelectric generator; thermoelectric heat pump; heat transfer; finite-time thermodynamics; non-equilibrium thermodynamics

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Revista Mexicana de Física

ISSN: 2683-2224 (on line), 0035-001X (print)

Bimonthly publication of Sociedad Mexicana de Física, A.C.
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