A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-

Question

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 . degree C for the thermal conductivity of glass and 0.0234 J/s . m . degree C for the thermal conductivity of air to answer the following.) (a) If the inside surface temperature is 20.9 degree C and the outside surface temperature is 0.0 degree C, determine the rate of energy transfer through 1.20 m2 of the window. W (b) Compare your answer to (a) with the rate of energy transfer through 1.20 m2 of a single 1.0-cm-thick pane of glass. Disregard surface air layers. Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. W Need Help?

Explanation / Answer

b) P2= 0.8*1.2*20.9/0.01

or P2=2006.4

so P2/P1=2006.4/57.019

=35.188

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