本文乃探討在強迫對流及結霜狀態下鰭片間距對單橢圓管式之管鰭片蒸發器之鰭片上之熱傳係數的影響。論文內容包含數值及實驗分析兩部分，即以實驗擷取不同量測位置之鰭片溫度，而後再配合反算法來預估熱傳係數與環境條件之間的關係。

　　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相對誤差甚小為止。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靈敏，因此本文也將探討量測誤差對預測值的影響。

　　本文將以自行設計的板鰭管式蒸發器之鰭片組並配合相關實驗設備，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上之結霜熱傳係數。研究結果顯示迎風面區域的溫度會大於背風面區域的溫度，而且迎風面之熱傳係數會大於背風面的熱傳係數。

　　The purpose of this thesis is to investigate the effect of the fin spacing on the frosted heat transfer coefficient of the plate fin inside plate finned-tube evaporator with one - tube elliptical tube under force convection. The thesis includes the numerical and experimental parts. The present inverse scheme in conjunction with the fin temperature measurements 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 schemes. 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. The results show that the temperature with the wind is higher than that on the lee side and the heat transfer coefficient has the same trend.

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