Chapter 1, Problem 160P

A person standing in a room loses heat to the air in the room by convection and to the surrounding surfaces by radiation. Both the air in the room and the surrounding surfaces are at ${\text{20}}^{\text{o}}\text{C}\text{.}$ and The exposed surface of the person is 1.5 m² and has an average temperature of ${\text{32}}^{\text{o}}\text{C}$ and an emissivity of 0.90. If the rates of heat transfer from the person by convection and by radiation are equal, the combined heat transfer coefficient is

1. $\text{0}{\text{.008W/m}}^{\text{2}\text{.}}\text{K}$
2. $\text{3}{\text{.0 W/m}}^{\text{2}\text{.}}\text{K}$
3. $\text{5}{\text{.5 W/m}}^{\text{2}\text{.}}\text{K}$
4. $\text{8}{\text{.3 W/m}}^{\text{2}\text{.}}\text{K}$
5. $\text{10}{\text{.9 W/m}}^{\text{2}\text{.}}\text{K}$