MeEn 340

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# MeEn 340 - PowerPoint PPT Presentation

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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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
• 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

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.

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.
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.