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3.12 A thermopane window consists of two pieces of glass 7 mm thick that enclose an air space 7 mm thick. The window separates room air at 20"C from outside ambi- ent air at -10"C. The convection coefficient associated with the inner (room-side) surface is 10 W/m- . K. (a) If the convection coefficient associated with the outer (ambient) air is h, = 80 W/m- -K, what is the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglect radiation, and assume the air enclosed between the panes to be stagnant. (b) Compute and plot the effect of h, on the heat loss for 10