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. If the inside surface temperature is 20.0°C and the outside surface temperature is 0.0°C, determine the rate of energy transfer through 1.5 m2 of the window. Compare your answer with the rate of energy transfer through 1.5 m2 of a single 1.0-cm-thick pane of glass.


thermopane window

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Your response differs from the correct answer by more than 10%. Double check your calculations. J/s



single pane window

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Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. J/s

Explanation / Answer

Usethis problem i did as a guideline. A Thermopane window consists of two glasspanes, each 0.50 cm thick, with a 1.0-cm-thick sealed layer of airbetween. If the inside surface temperature is 23°C and theoutside surface temperature is 0.0°C, determine the rate ofenergy transfer through 1.0 m2 of the window. Comparethis with the rate of energy transfer through 1.0 m2 ofa single 1.0-cm-thick pane of glass. You will need to look up the thermal conductivity, k, forglass and air in the textbook that you are using since your bookmay have slightly different values than mine. I found k(glass) = 0.8W/m-deg and k(air) = 0.0234 W/m-deg The rate of heat transfer thru a series of slabs, in units ofJoules/ sec, or Watts, is: ?H/?t = A ?T /[Lg / kg + Lair /kair + Lg / kg ] , where L is thickness of each material. = ( 1 m2 ) (23 deg) / [ .005/.8 + .01/.0234 + .005/.8 ] = 52.3Watts. For a single pane of glass, we have: ?H/?t = (1 m2 ) (23 deg ) /[ .01 / .08 ] = 184 Watts.

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