The outer surface of a charcoal burner has a temperature of 300 C. The fan, near the charcoal burner, is u to provide oxygen to the burning charcoal. If it has a surface temperature of 70 C, what is the net radiant energy, in W/m² exchange between the charcoal burner and fan? Use an emissivity coefficient of 0.8. a. 3910 с. 4730

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