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

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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.
(a) If the inside surface temperature is 20.8°C and the outside surface temperature is 0.0°C, determine the rate of energy transfer through 1.25 m2 of the window. 
   W 

(b) Compare your answer to (a) with the rate of energy transfer through 1.25 m2 of a single 1.0-cm-thick pane of glass. Disregard surface air layers. (Find the rate of energy transfer.) 
 kW
Jun 20th, 2015

Thank you for the opportunity to help you with your question!

ΔxGlass=0.0050, kGlass=0.84, ΔxAir=0.010, kAir=0.0234, ΔT=20.8-0, WindowArea=1.25

HeatLossPerSecond=[1.25*20.8]/(2*0.0050/0.84 + 0.010/0.0234)=26/0.439255=59.19

HeatLossPerSecond1=[1.25*20.8]/(2*0.0050/0.84)=26/0.01190476=2.18

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 20th, 2015

thanks


Jun 20th, 2015

you are welcome

Jun 20th, 2015

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