Chapter 1, Problem 1.73P

Consider the conditions of Problem 1.22,but the surroundings temperature is 25°C and radiation exchangewith the surroundings is not negligible. 1f the convection coefficient is $6.4{\text{W/m}}^{\text{2}}\cdot \text{K}$ and the emissivity of theplate is $\in =\text{0}\text{.42}$ , determine the time rate of change ofthe plate temperature, $dT/dt$ , when the plate temperatureis 225°C. Evaluate the heat loss by convection and theheat loss by radiation.