Chapter 3, Problem 3.3P

The rear window of an automobile is defogged by passingwarm air over its inner surface.

1. If the warm air is at $T_{\infty ,i}=40°\text{C}$ and the correspondingconvection coefficient is $h_i=30{\text{W/m}}^{\text{2}}\cdot \text{K,}$ whatare the inner and outer surface temperatures of4-mm-thick window glass, if theoutside ambient airtemperature is $T_{\infty ,o}=-10°\text{C}$ and the associated convectioncoefficient is $h_o=65{\text{W/m}}^2\cdot \text{K?}$ In practice $T_{\infty ,o}$ and $h_o$ vary according to weatherconditions and car speed. For values of $h_o=2,6.5,$ and $100{\text{W/m}}^2\cdot \text{K,}$ compute and plot the inner andouter surface temperatures as a function of $T_{\infty ,o}$ for $-30\le T_{\infty ,o}\le 0°\text{C}\text{.}$