(a) If the inside surface temperature is 20.2°C and the outside surface temperature is 0.0°C, determine the rate of energy transfer through 1.75 m2 of the window.

(b) Compare your answer to (a) with the rate of energy transfer through 1.75 m2 of a single 1.0-cm-thick pane of glass. Disregard surface air layers.

A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed layer of air in between. (Use 0.8 J/s · m · °C for the thermal conductivity of glass and 0.0234 J/s · m · °C for the thermal conductivity of air to answer the following.)