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Experimental study of operating range and radiation efficiency of a metal porous burner

Hashemi S.A. (Department of Mechanical Engineering, University of Kashan, Kashan, Iran + Energy Research Institute, University of Kashan, Iran)
Nikfar M. (Department of Mechanical Engineering, University of Kashan, Kashan, Iran + Energy Research Institute, University of Kashan, Iran)
Motaghedifard R. (Department of Mechanical Engineering, University of Kashan, Kashan, Iran)

In this paper, a radiant metal porous burner which is formed from wire mesh layers is studied. Surface temperature of the burner is measured in different equivalence ratios and firing rates and radiation efficiency is calculated for each case. The experiments are performed for different thicknesses of the porous medium. The results show that the surface temperature increases with increasing firing rate and maximum surface temperature occurs in a lean mixture. Comparing the results for different thicknesses shows that maximum surface temperature is obtained in a medium with three-layer of wire mesh. The radiation efficiency of the burner decreases with increasing firing rate. The maximum radiation efficiency is about 30 percent which is obtained in the three-layer of wire mesh in the minimum firing rate. Comparison of the results with the other works shows a good agreement between them.

Keywords: porous medium, radiant burner, wire mesh, radiation efficiency, surface temperature