Heat-Transfer and Friction Characteristics for the Louver-Fin Heat Exchanger
Heat-Transfer and Friction Characteristics for the Louver-Fin Heat Exchanger
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DOI：
10.2514/1.9123
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发表时间：
2004
影响因子：
2.1
通讯作者：
Joung-Ha Kim;J. Yun;C. Lee
中科院分区：
文献类型：
--
作者：
Joung-Ha Kim;J. Yun;C. Lee
本文主要研究了在较低风速下钎焊铝百叶窗翅片换热器的传热和摩擦特性。以百叶窗翅片式换热器为研究对象，对百叶窗翅片换热器的重要参数--矩形度和翅片间距进行了实验研究。试验条件由四个矩形、三个翅片节距和各种空气雷诺数（范围从110到800）改变。实验结果表明，翅片间距对换热的影响较大，而翅片夹角对压降的影响较小。采用换热器性能评价准则，使传热系数和泵功率等主要操作变量同时考虑。f/f 1/3比值随着顶角的增大而减小。j/f 1/3比的最佳值存在于顶角的20-25度附近。对于诸如30度和35度的相对高的直角，在Lp/Fp = 1.03、1.20和1.43的条件下，j/f 1/3比具有几乎相同的值。
The present work focuses on the effects of heat-transfer and friction characteristics for the brazed aluminum louver-fin heat exchanger used in a air conditioner with a relatively low air velocity. The heat-transfer and friction characteristics were experimentally studied for the different louver angles and fin pitches of the louver-fin heat exchanger, which are supposed to he the important parameters. Test conditions were varied by four louver angles, three fin pitches, and various Reynolds numbers of air, which ranged from 110 to 800. The experimental results show that the heat transfer is mainly affected by the fin pitch rather than the louver angle, whereas the pressure drop is affected by the louver angle rather than fin pitch. The performance evaluation criterion of heat exchangers is adopted so that the major operational variables, such as heat-transfer coefficient and pumping power, can be considered simultaneously. The f/f 1/3 ratios decrease as the louver angle increases. The optimal value of the j/f 1/3 ratio exists around 20-25 deg of the louver angle. For relatively high louver angles such as 30 and 35 deg, the j/f 1/3 ratios have almost the same value under the condition that the Lp/Fp = 1.03, 1.20, and 1.43.