Finite-time thermoeconomic optimization of a non endoreversible heat engine model

M.A. Barranco-Jiménez

Abstract


Within the context of Finite-Time Thermodynamics (FTT), we study the
thermoeconomics of a simplified non-endoreversible thermal power plant model
(the so-called Novikov engine). In our study, we use different heat transfer
laws: the so called Newton's law of cooling, the Stefan-Boltzmann radiation
law, the Dulong-Petit's law and another phenomenological heat transfer law.
We use two FTT optimization criteria: the maximum power regime (MP) and the
so-named modified ecological criterion for performance analysis. This
last criterion leads the engine model towards a mode of performance that
appreciably diminishes the engine's wasted energy. It is shown that under
ecological conditions the plant dramatically reduces the amount of heat
rejected to the environment, and a loss of profit is translated into a
better usage of fuel such that the heat rejected towards the environment is
remarkably reduced compared to that of a maximum power regime. Besides,
we analyze the effect on the reduction of power output and the optimal
efficiencies in terms of an internal irreversibility parameter that comes
from the Clausius inequality which characterizes the degree of internal
irreversibility.

Keywords


Thermoeconomics; endoreversible cycles; optimization

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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.
Departamento de Física, 2o. Piso, Facultad de Ciencias, UNAM.
Circuito Exterior s/n, Ciudad Universitaria. C. P. 04510 Ciudad de México.
Apartado Postal 70-348, Coyoacán, 04511 Ciudad de México.
Tel/Fax: (52) 55-5622-4946, (52) 55-5622-4840. rmf@ciencias.unam.mx