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Window Comparison

Window Comparison. Kasey Pearce ME 340 W10. Is Double or Triple Pane Better?. Are double pane windows just as effective as triple pane? My father who owns a window business seems to think so, and I researched what he has told thousands of customers to keep him honest. Experiment.

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Window Comparison

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  1. Window Comparison Kasey Pearce ME 340 W10

  2. Is Double or Triple Pane Better? • Are double pane windows just as effective as triple pane? My father who owns a window business seems to think so, and I researched what he has told thousands of customers to keep him honest.

  3. Experiment • Used a single pane, double pane, triple pane setup. • Hot (325 K (ie Arizona)), Cold (250K), and Windy (vel=13.4m/s) days. • Double pane and triple pane windows had Argon as the insulating gas, double strength low e glass, with a single strength pane in the middle for the triple pane. • Assumed no radiation (transparent – though triple pane does have much less transparency than the single pane). Assumed 1-D, steady flow. • Free convection negligible on inside because the Ra < 1708 which means air cannot circulate.

  4. Calculations

  5. Results

  6. The three windows by the numbers

  7. Conclusion • The double pane window lets 5 times less heat transfer on a cold day than the single pane whereas the triple pane is 5.5 times less. • The windy day comparison was a surprising. The windy day shows the difference in resistance of the window with hardly any resistance due to convection outside, and thus is shown how drastic the thermal resistance is between a single and double pane. The double versus triple is still improved, but not a change that would be noticed by homeowners. • In the end it looks like my father has kept his integrity!

  8. Error • Possible sources of error could arise in the radiation heat transfer. I did not take into account the radiation for example in the Hot days on the triple pane, where it would make a difference. • Also forced convection was used as the outside condition on all three days, where free convection might have given a closer approximation on a stagnant day.

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