A special diffuse glass with prescribed spectral radiative properties is heated in a large oven. The walls of the oven are lined with a diffuse, gray refractory brick having an emissivity of 0.75 and are maintained at T_w = 1800 K. Consider conditions for which the glass temperature is T_g = 750 K.

  (a) What are the total transmissivity τ, the total reflectivity ρ, and the total emissivity ɛ of the glass?

  (b) What is the net radiative heat flux, q"_net.in (W/m²), to the glass?

  (C) For oven wall temperatures of 1500, 1800, and 2000 K, plot q"_net.in as a function of glass temperature for 500 < T_g < 800 K.