Heat exchangers are frequently installed at an inclined angle to reduce the height of the air-conditioning unit. The inclination may deteriorate the thermal performance of the heat exchanger, and the effect will be more severe for an aluminum heat exchanger compared with a conventional fin-and-tube heat exchanger. However, the literature shows very limited investigations on this subject. In this study, a series of tests were conducted for a newly-developed aluminum heat exchanger, which has an additional drainage channel at downstream of the fin. Results showed that the pressure drop increased as inclination angle increased. However, the heat transfer coefficient showed a minimum behavior at approximately 45° inclination angle. This was true both for dry and wet conditions. The effect of inclination angle on the ratio between wet and dry j and f factor was not significant, which suggested that the inclination did not alter the condensate pattern on the louver fin (louver-bridging, fin-bridging, etc.) significantly. Comparison of the thermal efficiency indices (j/f^1/3) of the present sample with those of the conventional sample (having no drainage channel) showed that the thermal performance improvement is significant under wet condition, which confirms the excellent condensate drainage of the present sample.

热交换器通常以倾斜角度安装，以减小空调单元的高度。倾斜会降低热交换器的热性能，并且与常规的翅片管式热交换器相比，对于铝热交换器而言，其效果将更为严重。但是，文献显示对此主题的研究非常有限。在这项研究中，针对新开发的铝制热交换器进行了一系列测试，该铝制热交换器在散热片的下游具有一个额外的排水通道。结果表明，压降随着倾角的增加而增加。但是，传热系数在大约45°的倾斜角下表现出最小的行为。在干燥和潮湿条件下都是如此。倾角对干湿比的影响j和f系数不显着，这表明该倾斜度不会显着改变百叶窗翅片上的冷凝物模式（百叶窗桥接，翅片桥接等）。将本样品的热效率指标（j / f ^1/3）与常规样品（无排水通道）的热效率指标进行比较，结果表明，在潮湿条件下，热性能的改善非常显着，这证实了该冷凝器的优异冷凝水排放能力。现在的样品。