Abstract

A numerical study based on direct thermal to electric energy conversion was performed in reciprocal flow porous media burners coupled with thermoelectric modules. A two-dimensional mathematical model for filtrational combustion and a finite time thermodynamics model for the thermoelectric elements energy fluxes were employed to predict the optimal set of operational and structural variables that maximize the system overall efficiency. Flammability limits were found for establishment of stable conditions and further computation of electric current and power output generated within the system. The parametric study, which included variation of reactor cross-sectional area and wall insulation, showed that the major values for electric current and power output were obtained for either reactors with no insulation at the middle zone or with a lower cross-sectional area. The ranges of maxima found for electric current and power output were [630, 790] mA and [3.5, 5.5] W, respectively.