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Radiant Energy - Hot Water Radiator Questions Building Science 1: BSCI 2101 A domestic hot water radiator in a house has a surface area of 2m2. Using table 4.1 anc the Stefan-Bolizmann equation, solve the following questions. Use the average emissivity value in each case, and the temperature range from the table closest to the values given. 1. Calculate the radiant energy given off by its surface if the surface is polished iron at 60C. 2. How much more energy is given off if the temperafure is raised to 80C ? 3. What if the radiator is painted with dark paint and set at 60C ? 4. What if the radiator is painted with white paint and set at 60C ? 5. How hot would the polished iron radiator bare to be to gro off the same nadraat energy as the dark or white paint radiator at 600C