本論文總共分兩個部分，第一部分使用吸入型開放式風洞對水箱測試本體做熱液動性能分析，分別找出其熱傳因子j和壓降因子f，並找出其對Re之關係圖。第二部分在開發一套水箱電腦輔助分析及設計軟體。
　　水箱熱液動性能分析部分：水箱屬於鰭管式熱交換器的一種應用，影響鰭管式熱交換器之性能除了熱交換器本體之鰭片間距，鰭片材質等之外，鰭片型式亦是一個重要因素。本論文除了改變熱交換器鰭片間距和材質外，另外測試了總共有三種不同鰭片形式的熱交換器。從實驗結果看出，熱傳效果是曲型最佳，裂口型次之，平板型之鰭片最差。
　　水箱電腦輔助分析及設計軟體部分：本論文建立了一套分析及設計軟體，使用者經過簡單的操作，可以分析以知尺寸水箱之性能，也可以由所需的操作條件設計出最適合的水箱尺寸。

　　There are two parts in this paper. In the first part of this paper, an induced open wind tunnel was used to measure the thermal-hydraulic characteristics of automotive radiators. Three kinds of fins were tested. The experimental results indicated that the heat transfer coefficients for the louver fins are 10﹪higher than those for the slit fins; and the slit fins are 26﹪higher than those for the flat fins. In addition, the relationship for the Colburn factor j and friction factor f versus the Reynolds number was presented.
　　In the second part of the paper, an interactive computer-aided design software for the automotive radiators was developed. It is written by Visual Basic 6.0 and can be run in any personal computer. The software has the following two functions:
(1)　Prediction the performance of a radiator when the dimensions are given.
(2)　Determination the necessary size of a radiator when given the required performance.

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