A glass window measuring 0.75 m in height, 1.15 m in width, and 0.2 m in thickness. It has a thermal conductivity of 0.25 W/mK. The temperatures of the inner and exterior surfaces of the window are measured to be 20 C and 35 C, respectively, on a sunny day. l,

a) Heat transfers from the surrounding (outside) through the glass window. Identify the main mode of heat transfer within the window. b) Define thermal conductivity. c) Find the rate of heat loss through the wall using Fourier's law d) Find the rate of heat loss using thermal resistance concept