Chapter 1, Problem 154P

Heat is lost through a brick wall $\text{(}k=\text{0}{\text{.72 W/m}}^{\text{.}}\text{K),}$ which is 4 m long, 3 wide, and 25 cm thick at a rate of 500 W. If the inner surface of the wall is at ${22}^{\text{o}}\text{C,}$ the temperature at the midplane of the wall is

1. $0^{\text{o}}\text{C}$
2. ${7.5}^{\text{o}}\text{C}$
3. ${11.0}^{\text{o}}\text{C}$
4. ${14.8}^{\text{o}}\text{C}$
5. ${22}^{\text{o}}\text{C}$