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研究生:李啟賢
研究生(外文):Lee, Chi-Shien
論文名稱:利用逆向熱傳導方法預測板鰭管式熱蒸發器於結霜狀態下之熱傳係數與鰭片效率
論文名稱(外文):Application of the inverse heat conduction technique to estimate the heat transfer coefficient and fin efficiency on the plate finned-tube evaporator under frosting conditions
指導教授:陳寒濤陳寒濤引用關係
指導教授(外文):Han-Taw Chen
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:99
中文關鍵詞:逆向熱傳導方法熱傳係數結霜
外文關鍵詞:InverseHeat transfer coefficientFrosting
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本文主要在研究氣冷板鰭管式蒸發器上之鰭片的結霜問題。因此,本文先
探討鰭片上之熱傳係數視為常數時所求得之鰭片熱傳量及效率與實際情況
的差異。而後再以逆向熱傳導方法,並配合於鰭片不同位置所量取之溫度
值來反求鰭片上之熱傳係數,以驗證本文方法之準確性。此外,並探討溫
度量測誤差及熱偶計之安置位置對本文預測結果的影響。我們也自行設計
一單管型之板鰭管式蒸發器,並配合相關的實驗設備,以量測霜層厚度與
鰭片溫度。根據這些數據,再配合本文之逆向熱傳導方法來估算鰭片於結
霜狀態下的熱傳係數、熱傳量與效率。並探討外界溫度、相對濕度與冷媒
溫度對鰭片霜層成長、熱傳係數、總熱傳量以及效率的影響。經由本研究
可了解蒸發器於不同操作條件下,結霜現象對其性能所造成的影響。期望
本文結果可作為產業界在從事冷凍空調系統設計時之參考。
This thesis presents a hybrid numerical scheme for the inverse
heat conductionproblem and an experimental equipment to estimate
the heat transfer coefficient and fin efficiency on the Plate
Finned-Tube Evaporator under frosting conditions. Thus, the
comparison of the heat transfer rate and fin efficiency obtained
by the assumption of the constant heat transfer coefficient and
the exact values is made. Afterward, the scheme of the inverse
heat conduction in conjunction with temperature measurements at
various times and various sensor locations is presented to
estimate the heat transfer coefficient on the fin.To evidence
the accuracy of the present scheme,the comparison of the present
estimations and exact values is made.In addition, the effect of
the measurement error and sensor location on the estimated
results is also be studied. We set up a plate finned-tube
evaporator in conjunction with the other experimental equipments
for measuring the frost thickness and fin temperature. The heat
transfer coefficient, heat transfer rate and fin efficiency on
the fin under frosting conditions can be determined using the
present method and these temperature measurements. In addition,
the effect of relative humidity of the air, refrigerant
temperature and air temperature on the frost growth, heat
transfer coefficient,overall heat transfer rate and fin
efficiency is also investigated. This tesis can present some
information for the relation between the frosting phenomenon and
performance of the evaporator under various operation
conditions. We hope that its results are useful for the design
of the refrigeration and air condition system.
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