Evaluation of radiative entropy generation in a high temperature system including H2O, CO2 and soot with non-gray wall

•Radiative entropy generation due to H2O, CO2, soot and nongray wall is investigated.•Radiation processes of wall have main contribution on radiative entropy generation.•H2O and soot have more effect on radiative entropy generation than CO2.•Radiative entropy generation varies with total hemispherical absorptance of wall.