本研究計畫為「兼顧雨天玻璃除霧和車內舒適度之最佳化汽車空調系統之實車研製」。根據已結案的國科會計畫「汽車擋風玻璃之除霧之數值及實驗分析」(NSC89-2212-E-168-011)研究結果指出，目前使用中的各種汽車的空調系統在炎熱的雨天時，因駕駛者為求舒適，打開A/C 冷氣吹向車內以降低溫度。當車內氣溫愈低;或/和車速愈慢(車外熱空氣加熱擋風玻璃的效果降低);或/和車外氣溫愈高;或/和車外相對濕度愈高(露點愈高)，必然導致擋風玻璃車外側溫度，會低於車外空氣的露點而結霧。唯一解決方法，只有同時開暖氣以提高車內溫度，以達同時提高擋風玻璃車外側溫度。當擋風玻璃車外側溫度高於車外空氣的露點才不會結霧，但也為此而加高車內溫度令乘客不舒適。因此，在高溫的雨天駕駛汽車時，駕駛往往為了舒適而打開冷氣，因無法以目前所有的汽車空調系統，作有效炎熱雨天的擋風玻璃除霧。常常因天雨路滑，而加上駕車者視線又不良，會導致大車禍的發生。本人兩年以來，一再對各種目前的汽車空調系統加以探討，最後終於發覺，只要應用除霧知識，對目前汽車空調系統管路稍加改變，便可解決熱天下雨時無法兼顧擋風玻璃除霧和車內舒適度的難題。同時，改良後的系統，不論在寒、溫和熱帶任何地區，和春夏秋冬任何季節，在雨天中開車時，均可成功地將汽車擋風玻璃上的結霧清除並保持不結霧，同時又可調整出最舒適的車內溫度，因而能行車更安全；另外，也可以根據本計畫研發之方法和設備，設計製造出最佳之自動恒溫恒濕以不結霧的汽車空調系統。The purpose of this project is to fabricate an optimum vehicle air conditioningsystem of a real vehicle for both comfort and windshield defog in rainy days.According to the studied results of NSC project “The Best Defrost Method ofVehicle’s Windshield by Experimental and Computer Aid Analysis ”(NSC-89-2212-E-168-011), while using any one of the present various airconditioning systems of vehicle during the hot rainy days, the driver will use the A/Cfunction to blow toward the passengers for cooling down the air temperature insidevehicle and make passengers more comfortable. The lower the temperature inside thevehicle; or/and the slower the vehicle speed (the lower heating effect on thewindshield by the outside hot air); or/and the higher the temperature of outside air;or/and the higher the relative humidity (the higher the dew point of outside air), thehigher possibility of causing the fogged windshield will be. Because in the abovesituations, the outside temperature of windshield will be more possible lower than thedew point of outside air. The only defog method is to open the heating functionsimultaneously to make the inside temperature higher and then make the outsidetemperature of windshield higher. But it will cause a higher uncomfortabletemperature inside vehicle as well. Thus, driving a car during the hot rainy days, it isvery hard to defog the windshield effectively by using the present air conditioningsystem of vehicle. The car accidents will be always happened because of the slippingroad caused by rainy weather and poor eyesight of driver. After studied the various airconditioning systems of vehicle repeat and repeat during the past two years, it hasbeen found that an optimum air conditioning system of a vehicle for both comfort andwindshield defog in rainy days can be achieved by using the knowledge of defog tomodify the flow tunnels of present air conditioning system. In the meanwhile,wherever cold, warm and hot regions, whenever spring, summer, autumn and winterseasons, this improved system can defog the windshield effectively when drivingduring rainy seasons. And the most comfortable temperature can also be obtainedsimultaneously. Additionally, the automatically control air conditioning system ofsteady temperature and steady humidity as well as windshield defog can be alsoobtained by using the method and design developed by this project.