Solution Manual Heat And Mass Transfer Cengel 5th: Edition Chapter 3 New

q = -1.2 * 1 * 100 = -120 W/m²

R = L / k * A

The heat transfer through the wall is:

dT/dx = (80 - 40) / 0.4 = 100°C/m

To solve this problem, we can use Fourier's law of heat conduction: q = -1