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MeEn 340

By Eric McKane and Benton Russell. MeEn 340. Ambient temperature inside an automobile subject to external conditions. Developing equations for analysis:. Assumptions : Absorptivity of glass is negligible Absorptivity of seat fabric is 0.6 Assume no radiation heat transfer to the air

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MeEn 340

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  1. By Eric McKane and Benton Russell MeEn 340 Ambient temperature inside an automobile subject to external conditions.

  2. Developing equations for analysis: Assumptions: • Absorptivity of glass is negligible • Absorptivity of seat fabric is 0.6 • Assume no radiation heat transfer to the air • Assume non-glass heat conduction losses are negligible • Assume convection coefficient h=2 for at inner glass surface • Temperature fluctuations are small, so Pr = constant = 0.707 • Mixed laminar, turbulent regime

  3. Relevant Equations

  4. The figure above is a plot generated in matlab that depicts the rise in the internal temperature of the car based on the external temperature.

  5. Improvements to the model: • Our model assumes constant solar flux into the car, therefore, the model could be improved by inputting actual solar flux data. • Experiments could be used to more accurately determine the effects of wind speed on convection heat transfer. • We assumed constant thermal properties. The model could be improved by taking into account non-constant properties.

  6. Conclusion • For constant solar flux the internal temperature of the car strongly depended on the external ambient temperature of the car. • Even in relatively low temperatures (e.g. T > 10ºC) the temperature inside the car will be significantly higher.

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