Chapter 12, Problem 12.114P

A contractor must select a roof covering material from the two diffuse, opaque coatings with ${\alpha }_{\lambda }\left(\lambda \right)$ as shown. Which of the two coatings would result in a lower roof temperature? Which is preferred for summer use? For winter use? Sketch the spectral distribution of $\left(\lambda \right)$ that would be ideal for summer use. For winter use.