=+8-21. One approach to reducing attic heat transfer is to install a radiant barrier, e.g ., aluminum foil on one or more surfaces. If we were to line the inside of the pitched roof surfaces of Problem 8-19 with aluminum foil (€ = 0.1), and everything else were to remain the same, how would the radiation flux incident on the attic floor change? Please answer quantitatively.

If we were to line the inside of the pitched roof surfaces of Problem 8-20 with aluminum foil