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1
題名:鰭管式熱交換器熱傳性能比較    
An Investigation of Air-Side Heat and Mass Transfer Performance of the Fin-and Tube Heat Exchangers
著者:張峻榮(Chun-Jung Chang) ;都源展(Yuan-Jan Du) ;陳文智(Wen-Ji Chen) ;陶惟翰(Wei-Han Tao)
出版地區:台灣
出版城市:台北市
學科:自科綜合 ; 應科綜合
關鍵字:Fin-and-Tube Heat Exchanger ; Heat Exchanger ; Slit fin ; Plain fin ; Correlation
刊名:華岡工程學報
卷期:13期(1999.6)
頁碼:133-150
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

本文針對24組緒管式熱交換器,分別使用平板型鱗片和狹縫型鱗片製造。在開放式風洞和循環式風洞設備中,分別進行乾盤管與濕盤管甜試。討論管排數、繕片間距、鱗片型式對於賭管式熱交換器的影響。測試的結果是以科本因子j ( 或稱熱傳因子)和摩擦因子/相對於雷諾數ReDC的變化來表示。乾盤管測試的雷諾數範圈由300 至U 8 月00 0 濕盤管測試的雷諾數範聞自500 到4,500 從乾盤管測試結果發現,狹縫型鱗片熱交換器的熱傳效率會隨鱗片的減小而增加,當管排數大於4時,鱗片間距的影響在中低風速的情況是相反的。空氣側的熱傳效率會隨管排增加而減少, 1旦摩擦由于/ 卻和管排數幾乎沒有關係。最後找出狹縫型鱗片的熱傳因子j和摩擦園子/的經驗公式,在誤差1的以內的數據分別有83 . 09%和92 . 8 1 % ;其平均誤差分別為5 . 5%和3 .協o 濕盤管測試單排和雙排熱交換器的結果發現,狹縫型鱗片在入口環境的相對海度RHin = 5的和RHin = 90馬時對熱傳因子的影響在ReDC < 2, OOO很小,在ReDC > 2, OOO和較小的鱗片間距下,熱傳性能會隨風速增加而差距漸大。在濕盤管瀾試下發現,熱傳特性的表現與乾盤管灘試相近。摩蓋因子/在單排管時會隨相對濕度的增加和賭片間距減小而增加的趨勢。但是在多管排的狀態下,要達到相當的風速(吟>1. 5 m1s )才會看出相對濕度對於壓降特性的影響。
The present study tested the fin-and-tube heat exchangers with slit fin and plain fin geometry. A totals of twenty-four different specifications of heat exchangers were tested both in open type wind tunnel and close type wind tunnel. The effects of the number of rows, fin pitches and fin pattern of the airside heat and mass transfer performance were experimentally investigated. The results were compared and presented as Colburn j factor and fanning friction factor f against Reynolds number Reo, based on the fin collar diameter Dc in the range from 300 to 8,000in open type wind tunnel and from 500 to 4,500 in close type wind tunnel, respectively. In open type wind tunnel, the test results indicated that the heat transfer performance increased as the fin pitch decreased for one row configuration. However, when row was more than four, the effect of fin pitch on the heat transfer performance was reversed. In addition to the effect of fin pitch, the heat transfer performance decreased as the number of tube row in creased. But the friction characteristic was relatively independent of the number of tube row. Based on the present results and those from the former investigation by Nakayama, a general correlation is proposed to describe the airside performance of slit fin configuration. The mean deviation of the proposed heat transfer and the friction correlation are 5.23% and 3.59%, respectively. In close type wind tunnel, the test results indicated that the heat transfer performance was relatively independent of inlet relative humidity. However, when ReDc > 2,000 with smaller fin pitch, the heat transfer performance slightly increased with inlet relative humidity. The test results showed that the heat transfer performance in close type wind tunnel had a sim;lar trend compared with open type wind tunnel. Friction factor f increased with decreasing fin pitch, and also as the function of the slit fin geometry. The humidity of the inlet conditions in one row configuration showed as the function of the inlet relative humidity under high frontal velocity condition.


    

本卷期目次
華岡工程學報 13期 (1999.6)
Impact of Educational Reform on Engineering and Technology Education in Taiwan/ Franklin Fong-Ming Lee
建築物室內建材之揮發性有機物檢測分析研究/ 陶惟翰周淑梅張志成
Lossy Transmission Line Analysis in Large-scale Circuits by Using Relaxation-based Methods/ Chun-Jung Chen
鰭管式熱交換器熱傳性能比較/ 張峻榮都源展陳文智陶惟翰
以電漿濺鍍技術製備鈀-銀合金薄膜於氫氣分離之研究/ 陶惟翰楊淑卿林修正
非晶與奈米晶材料之探討及成立「非晶與奈米材料研發中心」芻議/ 李豐明
Reanalysis of Fatigue Life Assessments of Butt Welds/ Wen-Ching Chen
雨點軟接觸之施力及施力矩分析/ 鐘文遠
The Composite Structure Affect on the Mechanical Properties of Ni-25Al-xFe Intermetallics/ C. H. Tsau
飛行追蹤控制系統之?定性、可觀察性及可控制性分析/ 張松國
A Simple Algorithm of Beam Propagation Analysis Employing the Runge-Kutta Method/ Rong-Terng JuangChih-Feng HuangDeh-Ming ShyuKeh-Yi Lee
一種改良SDP最少項數的網路可靠度演算法/ 劉熙海劉齊祥吳維揚吳榮芳楊惠婷
無機?充材對PE/PET廢纖板之阻燃效果/ 李貴琪洪麗婷
 
   
 
   

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