A steam radiator uses pressurized saturated steam (P = 3.302 bar) to heat a room in the winter. The exterior surface of the radiator can be assumed to have the

same temperature as the steam at its boiling point. The total surface area of the radiator is 12.7 m², and it is exposed to surroundings that are at 15 °C. The emissivity of the radiator surface is 0 86 A. What is the total rate of heat transfer from the radiator to the room by radiation? B. What would the rate of heat transfer by radiation be if the radiator were coated with black paint to increase the emissivity to 0.98 (the paint will cause the surface temperature to drop by 2 °C). C. By comparison, how much heat would be transferred to the room from the radiator in part A if only FREE convection is considered, where hair = 2.9 W/m²-K, and T3=Tsat and Tsur=T = 15 °C.