Zhou Qin, Wang Hongyan, Wu Fuyuan, Liu Shengfei, Wei Huafeng, Hu Guoqing
Department of Engineering Mechanics, State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China.
Zhejiang Kangsheng Co., Ltd., Hangzhou 311700, China.
Micromachines (Basel). 2024 Aug 31;15(9):1120. doi: 10.3390/mi15091120.
Pin-fin and flat-tube heat exchangers (PFFTHXs) offer a promising alternative to traditional louvered-fin and flat-tube heat exchangers (LFFTHXs), especially when used as evaporators. The streamlined structure of pin fins helps to effectively remove condensate and defrost water. In this study, we conducted a numerical analysis of 60 different pin-fin configurations across three pin diameters to enhance heat transfer in PFFTHXs. Our investigation focused on how pin pitch affects both airflow and heat transfer efficiency. The results show that a closer pin pitch increases both the heat transfer rate per unit area and the pressure drop for a given airflow velocity. We evaluated the overall performance of these configurations using the heat transfer rate per unit frontal area obtained at equivalent fan power levels. The analysis identified optimal configurations for each pin diameter, with the 0.2 mm diameter configuration demonstrating the highest heat transfer efficiency-this was on par with louvered fins but used fewer resources. This makes it an ideal choice for evaporative applications in PFFTHXs.
针翅管和平板管换热器（PFFTHX）为传统的百叶窗翅片和平板管换热器（LFFTHX）提供了一种很有前景的替代方案，尤其是在用作蒸发器时。针翅的流线型结构有助于有效去除冷凝水和除霜水。在本研究中，我们对三种针径下的60种不同针翅结构进行了数值分析，以提高PFFTHX中的传热效率。我们的研究重点是针间距如何影响气流和传热效率。结果表明，对于给定的气流速度，较小的针间距会增加单位面积的传热速率和压降。我们使用在等效风扇功率水平下获得的单位迎风面积传热速率来评估这些结构的整体性能。分析确定了每种针径的最佳结构，直径为0.2毫米的结构表现出最高的传热效率——这与百叶窗翅片相当，但资源使用更少。这使其成为PFFTHX蒸发应用的理想选择。
