A wall (5 cm thickness, k=5 W/mK) has one side insulated at 200 degrees Celsius and the other side at 80 degrees Celsius. It is exposed to a fluid at 20 degrees Celsius with h = 5 W/m^2K. The total thermal resistances are:
R1 = 2 K/W
R2 = 10 K/W
R3 = 0.41 K/W
R4 = 0.03 K/W
R5 = 0.21 K/W