夏期炎天下における駐車自動車室内の温熱環境数値モデルの開発

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  • On Development of a Numerical Thermal Environmental Model of a Parking Automobile under Summer Solar Radiation

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A numerical model simulating surface and air temperatures in a parking automobile have been developed and numerical simulations were carried out to investigate thermal environment under summer solar radiation. In addition, comparisons with measurement results were conducted to verify and validate the simulation code. Numerical results in case of no ventilation showed that the maximum temperature was obtained and found to be over 90 degrees C. On the top of the front dashboard. On the other hand, air temperature near floorboard in the cabin was saturated to be at most 45 degrees C. They were consistent with the measurement results. Further, ventilating experiments were conducted. In these experiments, clean air freely came into the cabin from a front duct and hot air in the cabin was forced to be discharged at different flow rates from a rear duct located on the rear headrest in order to mitigate temperature rise. Then, temperature distributions around the driver's seat were investigated and compared with- and without-ventilation cases. Results show that temperature mitigation rate was almost proportional to the flow rate and the numerical model can estimate air and surface temperatures within ±5 K and ±10 K errors, respectively.

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