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

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

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 = Mixed laminar, turbulent regime

Relevant Equations

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.