自動車室内温熱環境数値モデルを用いた換気風速・換気風向の影響評価（運転席近傍の温度低減効果の検討）

摘要

一般に良く知られている事実であるが，夏期炎天下におrnいては，屋外駐車時の自動車室内空間は非常に高温となり，rn過酷な温熱環境になる．また，その高温環境により，車室rn内に居る乳幼児や高齢者の熱中症なども毎年報告されておrnり，深刻な問題となっている．%In a car under summer solar radiation, it is well known that temperature become very high and is found to be over 90 degrees rnC on the top of the front dashboard and also air temperature around the driver's seat were over 65 degrees C. Thus, a rnventilation system is one of the important ways for keeping comfortable thermal environment of a car cabin. In the previous rnpaper, numerical model of the parking automobile under summer solar radiation have been developed. Numerical simulations rnwere conducted and the temperature distribution was examined in cases with- and without- ventilation. Further, numerical rnresults of the model were compared with the measurements conducted in summer using a sedan-type car. In this paper, we have rnconducted additional numerical simulations of the cases with ventilations and examined the ventilation effect and its rndependencies on the inlet flow directions and velocities of the inlet duct for more efficient and smaller flow rate. The rnresults show that temperature mitigation rate highly depends on the inlet flow directions, particularly at higher inlet flow rnvelocity cases.