生活品質是現代人所追求的，在科技進步的今天，無論是食衣住行人們都期望得到舒適的環境，駕駛時也不例外，人們需要舒適的乘車空間，這也是業界近年來努力的方向。傳統上車廠針對車內環境的測試，都是利用實車實驗去模擬，然後針對實驗結果再對空調系統做調整，當然這是一項耗費時間與資源的工程。而近年來電腦模擬的崛起，使許多分析人員使用數值模擬的方式計算汽車室內空調系統與乘車員之熱舒適
度關係，進而討論乘車員最佳之熱舒適環境。
而車內環境之分析跟車內的空調系統與車外的外界環境影響息息相關，車內空調系統本文利用一套熱交換器的理論來估計車內出風口跟回風口之關係，車外環境本文採用實車實驗量取之邊界條件，此外另考慮 紊流模式(turbulent flow)與車殼之共軛熱傳，將以上條件導入STAR-CD套裝商業模擬軟體以求得車內溫度場與速度場之變化，並將數值結果由熱舒適指數PMV(Predicted Mean Vote)預測法來預估乘車員之熱舒適感受，並建立一套分析熱舒適度之軟體以利本文分析車內環境之舒
適性。

With the technology improving, the people have high quality of life. And people use car so frequently that they pay great attention to the air-conditioning, and thermal comfort of a passenger when buying a new car. So creating comfortable driving environment becomes an important ambition for automobile factory in last year. Traditionally, when factory design the air-conditioner system they usually get vehicle indoor information by experimental method, then they can regulate air-conditioner system according the experimental results. But actually the experimental method takes a lot of resources. With numerical technology great developing, many analyzer use numerical method to improve the passenger’s thermal comfort and understand the 3-D flow motion and the thermal behavior within vehicle. However, the indoor vehicles analysis correlated closely with the air conditioner and the outdoor environmental condition. In this steady, the air temperature relation between inlet and outlet vents calculated by NTU theoretical equations for heat exchanger, 3D unsteady tabulate model and conjugate heat transfer at the wall were regard as boundary conditions. Under those boundary conditions, we used numerical analysis software STAR-CD to calculate the air temperature and velocity distributions within vehicle. According the analysis results and PMV (Predicted Mean Vote) thermal comfort model, we can measure the passenger’s thermal comfort, and develop
software of thermal comfort analysis.

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