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Improving the performance of thermophotovoltaics using stabilized porous media combustion

A novel cylindrical porous media combustion-based thermophotovoltaic (PMC-TPV) system is proposed and experimentally studied. A mixture of methane-air is burnt at an equivalence ratio of 0.7 in a packed bed made of two layers of different alumina balls which are coated with ytterbia (Yb2O3) and erbia (Er2O3) for spectral control with gallium antimonide (GaSb) photovoltaic (PV) cells. A radiant reflector is used to increase the electrical output and the radiant efficiency. The experiments revealed it was possible to achieve a superadiabatic temperature of 1538 °C and a high radiant efficiency, 63%. Overall, this systematic analysis for lean Air/CH4 mixtures represents a new direction for TPV technology.