In manufacturing, the special coating on a curved solar absorber surface of area $A_2 = 15 m^2$ is cured by exposing it to an infrared heater of width $W = 1 m$. The absorber and heater are each of length $L = 10 m$ and are separated by a distance of $H = 1 m$. The upper surface of the absorber and the lower surface of the heater are insulated. The heater is at $T_1 = 1000 K$ and has an emissivity of $\epsilon_1 = 0.9$, while the absorber is at $T_2 = 600 K$ and has an emissivity of $\epsilon_2 = 0.5$. The system is in a large room whose walls are at 300 K. What is the net rate of heat transfer to the absorber surface?
