Feleke Dessalew Shite, Getie Muluken Z, Minale Temesgen Asefa
Faculty of Mechanical and Industrial Engineering, Bahir Dar Institute of Technology, Bahir Dar University, Bahir Dar, P.O.Box: 26, Amhara, Ethiopia.
Department of Mechanical Engineering, Debre Tabor University, Debre Tabor, P.O.Box 272, Amhara, Ethiopia.
Heliyon. 2024 Mar 3;10(6):e27254. doi: 10.1016/j.heliyon.2024.e27254. eCollection 2024 Mar 30.
The rectangular channel louvered-fin compact heat exchanger (LFCHE) is the most efficient type that has been served in a radiator. However, with this type of heat exchanger, the pressure drop rises by three to four times as the heat transfer increases, which results in decreasing performance. This research is aimed to numerically investigate the louver edges (vertical, inclined, and horizontal) effect on LFCHE performance at different louver angle () with air inlet velocities ranging from 1 to 30 m/s. A total of twelve models are made and simulated. The result revealed that the horizontal edge decreases the pressure drop up to 24.2% with a 1.01% increase in outlet air temperature over the base model (inclined edge). Thus, louver edge has design which results in higher and lower effect on pressure drop and temperature change, respectively. The research investigated the effects of louver edges using different performance evaluation criteria. At 10 m/s ( = 972.33) the horizontal edge increases the volume goodness () factor up to 21.49% over the base model. Similarly, the horizontal edged fins resulted in maximum increment of -factor by 22% and 25% as compared with inclined edge for louver angles of 24 (at low ) and 20 (at high ), respectively. Generally, the horizontally edged LFCHE is proven to have higher performance in cooling the coolant with a minimum air side pressure drop.
矩形通道百叶窗翅片紧凑式换热器（LFCHE）是散热器中效率最高的类型。然而，对于这种类型的换热器，随着传热增加，压降会上升三到四倍，这导致性能下降。本研究旨在通过数值研究百叶窗边缘（垂直、倾斜和水平）在不同百叶窗角度（）下，进气速度范围为1至30米/秒时对LFCHE性能的影响。总共制作并模拟了12个模型。结果表明，与基础模型（倾斜边缘）相比，水平边缘可使压降降低高达24.2%，出口空气温度升高1.01%。因此，百叶窗边缘的设计对压降和温度变化分别有高低不同的影响。该研究使用不同的性能评估标准研究了百叶窗边缘的影响。在10米/秒（=972.33）时，与基础模型相比，水平边缘使容积品质（）因子提高了21.49%。同样，对于24（低）和20（高）的百叶窗角度，与倾斜边缘相比，水平边缘的翅片使-因子分别最大增加了22%和25%。一般来说，事实证明，水平边缘的LFCHE在以最小的空气侧压降冷却冷却剂方面具有更高的性能。
