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Heat Transfer through a Wall with a Double Pane Window

Heat Transfer through a Wall with a Double Pane Window. By: Jacob Hipps and Doug Wright Me 340 Winter 2010. Assumptions:. The Convective Coefficient Inside ≈ 5 W/m 2 ·k The Convective Coefficient Outside ≈ 15 W/m 2 ·k. Known Quantities:. T Inside ≈ 20° C T Outside ≈ -5° C

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Heat Transfer through a Wall with a Double Pane Window

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  1. Heat Transfer through a Wall with a Double Pane Window By: Jacob Hipps and Doug Wright Me 340 Winter 2010

  2. Assumptions: • The Convective Coefficient Inside ≈ 5 W/m2·k • The Convective Coefficient Outside ≈ 15 W/m2·k Known Quantities: • T Inside≈ 20° C • T Outside≈ -5° C • K Sheet rock ≈ 0.17 W/m·k • K Insulation ≈ 0.026 W/m·k • K Wood ≈ 0.0.12 W/m·k • K Glass ≈ 1.40 W/m·k • K Air ≈ 0.0263 W/m·k

  3. Known Dimensions: Wall Window Wood Glass Sheet Rock Glass Insulation Air 0.019 m 0.089 m 0.019 m 0.019 m 0.089 m 0.019 m Wall Width 1.5 m Height 1 m Height 2.44 m Window Width 4.27 m

  4. Heat Transfer through Wall Alone

  5. Heat Transfer through Window Alone

  6. Total Heat Transfer • The assumptions that we made are for normal conditions (light breeze and average temperature outside). What if the conditions are not normal? • How much does the Rate of Heat Transfer Change with a higher Convective Coefficient? • How much does the Outside Temperature Effect the Rate of Heat Transfer?

  7. What happens when we vary the outside convective coefficient? • It is interesting to note that the outside convective coefficient has little effect on the Heat Transfer through the Wall and a much greater effect on the Heat transfer through the Window. • It is also interesting to note that once you reach a convective coefficient of 35 W/m2k, it has little effect on the Heat Transfer.

  8. What happens when we vary the outside temperature? • This graph shows that once you reach a certain temperature the direction of the Heat transfer changes (this is intuitive, but still good to recognize). • The temperature also plays a huge factor in the overall heat transfer.

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