3. In Heat Transfer unit operations one very important Law used is the Stefan-Boltzmann which applies only to blackbodies and theoretical surfaces that absorb all incident heat radiation. This states that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. This law can be employed to estimate the rate of radiation energy H from a surface by the equation H = AeoT4 where H is in Watts, A = surface area (m2), e = emissivity that characterizes the emitting properties of the surface (dimensionless), o = a universal constant called the Stefan-Boltzmann constant (= 5.67 x 10 - 8 Wm -2 K-4), and T = absolute temperature, K. Determine the percent relative true error of H for a steel plate with A = 0.52 m?, e = 0.83, and T = 749 ± 25. %3D

3. In Heat Transfer unit operations one very important Law used is the Stefan-Boltzmann which applies only to blackbodies and theoretical surfaces that absorb all incident heat radiation. This states that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. This law can be employed to estimate the rate of radiation energy H from a surface by the equation H = AeoT4 where H is in Watts, A = surface area (m2), e = emissivity that characterizes the emitting properties of the surface (dimensionless), o = a universal constant called the Stefan-Boltzmann constant (= 5.67 x 10 - 8 Wm -2 K-4), and T = absolute temperature, K. Determine the percent relative true error of H for a steel plate with A = 0.52 m?, e = 0.83, and T = 749 ± 25. %3D