Chapter 1, Problem 101EP

A 2-in-diameter spherical ball whose surface is maintained at a temperature of ${170}^{\text{o}}\text{F}$ is suspended in the middle of a room at ${70}^{\text{o}}\text{F}\text{.}$

If the convection heat transfer coefficient is $15\text{ Btu/h}{\text{.ft}}^2{{}^{.}}^{\text{o}}\text{F}$ and the emissivity of the surface is 0.8, determine the total rate of heat transfer from the ball.