Meen 340
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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

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MeEn 340

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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

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


Relevant equations

Relevant Equations


Meen 340

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.


Meen 340

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

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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