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为了提高房间空调器的全年性能系数(APF),室外机翅片在结霜工况和非结霜工况下的性能均需要提高,传统的开缝翅片只适用于非结霜工况的传热强化。本文提出一种采用镂空的强化结构,能同时强化结霜工况下和非结霜工况下翅片的传热性能。本文通过单片翅片的排水性实验验证镂空区域和镂空方向,并通过CFD优化镂空位置和镂空长度、宽度和间距。排水实验表明,竖直方向镂空结构的排水性最好。本文将新型镂空翅片与热泵型空调室外机中使用最广泛的波纹翅片进行比较。在非结霜工况下,优化后的镂空翅片的换热量比波纹翅片高7.5%;在结霜工况下,优化后的镂空翅片的换热量比波纹翅片高3.4%。
In order to improve the year-round coefficient of performance (APF) of room air conditioners, the performance of the outdoor unit fins in the frost condition and in the non-frost condition needs to be improved. The traditional slotted fins are only suitable for non-frost conditions Heat transfer enhancement. This paper presents a reinforced structure using hollow, which can strengthen both the frost conditions and non-frost conditions under the heat transfer performance of the fin. In this paper, the perforated area and hollowing direction are verified by the monolithic fin drainage experiment, and the hollowing position and hollowing length, width and spacing are optimized by CFD. Drainage experiments show that the hollow structure of the vertical drainage of the best. In this paper, the new hollow fin and heat pump air conditioner outdoor unit in the most widely used corrugated fins for comparison. In the non-frost conditions, the heat transfer of the optimized hollow fin is 7.5% higher than that of the corrugated fin; under the frost condition, the heat transfer of the optimized hollow fin is 3.4% higher than that of the corrugated fin, .