隨著國人生活水準提高及旅遊風氣盛行，社會大眾使用汽車漸趨頻繁，對於室內空調及舒適程度也日趨注重，故模擬汽車空調情況進而改善人體熱舒適度的分析，近年來變的越來越重要。因此可先藉由CAE電腦模擬的方式先行探討汽車內空調對其乘員冷熱感之影響，進而探討在何種情況下能對其乘員之冷熱感有最佳化之設計而達到最佳之舒適環境，進而減少車輛開發的時間與實驗金錢。
然而車內除熱能力分析與車內出風與回風溫度關係息息相關，故本文研究利用一套空調除熱的理論估計車內出風溫度與回風溫度，發展出一套車內除熱能力之交談式軟體，並利用空調除熱的ε-NTU理論為核心出入口邊界條件，並考慮κ-ε紊流(turbulent flow)模式與車殼的共軛熱傳，探討轎車與休旅車之車型在接受日曬照射下，模擬汽車內之空氣流動情形與車內空調負荷對車內溫度之影響，並求得車內溫度與流場隨時間變化之分佈情形。

With the living standard improving, the people use the automobile so frequently that the people pay great attention to indoor air condition of vehicle, and comfortable degree of people. So simulation automobile air conditioner situation to improve human body's hot comfortable analysis become more and more important. In order to improve the thermal comfort within passenger vehicle requires a detailed understanding of the 3-D flow motion and thermal behavior within vehicles.
In this study, application of the numerical simulation to reveal the vehicle thermal behavior in a vehicle. However, air temperature at air vent and heat capability have great relation. The air temperature at the vents are calculated using some ε-NTU theoretical equation for heat exchange, and developed a interface type software of heat exchanger capability. Finally, the air temperature relation between inlet and outlet vents was regard as boundary conditions, 3-D unsteady κ-ε turbulent model was used to simulate temperature field and flow condition of transient situation in the vehicle combined with cooling cycle analysis and conjugate heat transfer at the wall including solar radiation.

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