本論文研究內容為探討在自然和強迫對流下橢圓管之鰭片間距對板鰭管式蒸發器之鰭片於結霜狀態下之熱傳係數的影響。論文內容包含數值及實驗分析兩部分，在實驗中擷取不同量測位置之鰭片溫度，然後配合反算法預估熱傳遞係數與環境條件的關係。
　　
　　本研究運用混合拉氏轉換法(Laplacetransform technique)和有限差分法(Finite- differencemethod)之數值逆算法來解析二維逆向熱傳導問題以預測鰭片於結霜狀態下之熱傳係數。在進行逆算法的過程中，將以最小平方法(Least-squaresscheme)來修正預估值，直至於量測點之計算溫度與其所對應點之量測溫度之差甚小為止。一般而言，熱傳係數之預測值的精度對量測溫度的誤差極為敏感，本文也會探討量測誤差對預測值的影響。

　　本實驗將以自行設計的橢圓管式之管鰭片蒸發器配合相關實驗設備，以量取於結霜狀態下之鰭片溫度與管壁溫度。根據這些數據，再配合數值逆算法來估算鰭片之結霜熱傳係數。

　　The purpose of the thesis is to investigate the effects of the fin spacing on the frosted heat transfer coefficient of the plate fin inside plate finned-tube evaporator with two-tube elliptical tube under natural and force convection. The thesis includes the numerical and experimental parts. The present inverse scheme in conjunction with the fin temperature measurement at various measurement locations is applied to predict the frosted heat transfer coefficient on the plate fin.
　　
　　The hybrid numerical method involving the Laplace transform technique and the finite-difference method is applied to solve the 2-D inverse heat conduction problem in order to predict the frosted heat transfer coefficient on the fin. The least-squares scheme is applied to minimize the sum of the squares of the deviations between the calculated and measured temperatures in order to correct the estimated values. In general, slight inaccuracies of the interior measured temperatures can affect the accuracy of the estimated results for most of the previous inverse scheme. Thus the effect of the measurement error on the estimation of the frosted heat transfer coefficient will be investigated in the present analysis.
　
　　A plate finned-tube evaporator is set up in conjunction with its relative experimental equipments for measuring the fin temperature. The frosted heat transfer coefficient can be predicted by using the present inverse scheme in conjunction with the fin temperature measurements.

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