Subtopic: Steady state heat transfer in conduction, convection and radiation
Question Statement:
The heating surface of an oven has emissivity 0.7, area 0.1 m², maintained at 280°C. View factor of this surface w.r.t. a piece of bread of 0.01 m² area is 0.05. Bread has emissivity 0.3 and receives 10 W of energy through radiation from the heating surface (σ=5.67×10⁻⁸ W m⁻²K⁻⁴). The steady state bread surface temperature in °C is