汽車銅製水箱與鋁製水箱的散熱差異研究

Abstract

本論文主要針對水箱構造材料對於散熱的影響。水箱為熱交換器的一種，影響水箱散熱之性能除了鰭片形狀、間距外，鰭片材料亦是一個重要的因素，本論文採用最簡單的方式，直接比較兩個不同材質水箱的散熱能力。 實驗的汽車水箱鰭片材料以常用材料分為銅製水箱及鋁製水箱。為比較銅與鋁的散熱，引擎冷卻水採用純水（逆滲透水），不添加乙烯乙二醇（水箱精）。使用三菱汽車共同引擎1.2公升架上引擎，使用架上引擎可以排除車身阻礙空氣對流，原廠設計風扇為ECU與負溫度係數冷卻水溫感知器控制，為實驗而改使用手動定速電動散熱風扇，以減少實驗變數。藉用相同的設備，不同的實驗方式，在多重比較之下，試驗出水箱散熱性能的優劣。

The purpose of this proposal is to investigate the influence of the materials of radiators on heat translation. A radiator is one style of heat exchangers, which can be affected by the shapes, the intervals, and the materials of fins. This study adopts the simplest methods to compare the heat translating efficiency of two radiators made of different materials. Sorted by the materials of fins, the experimental radiators can be classified into copper radiators and aluminum radiators. To compare these two materials, pure water, with no ethylene glycol (also known as radiator rust inhibitor), is used as the coolant. Mitsubishi Automobile 1.2 L on the shelf engine is used to eliminate the interference of air convection. The original fans, which are controlled by ECU and negative temperature coefficient coolant temperature sensor, are changed into manual paced electric fans to reduce variables. In conclusion, by diverse experimental methods, this research evaluates the translating efficiency of different radiators using the same equipment.