This paper investigates the heat transfer performance of natural draft wire-on-tube condensers considering the geometric range of current designs adopted by the household refrigeration industry. Fifty-four samples with distinct geometries were manufactured and tested inside a standardized climate chamber that sets the air-side conditions, while a purpose-built apparatus was used to circulate hot brine through the coil with a strict control of the inlet temperature and mass flow rate. The results pointed out that the condenser height, and the wire and tube pitches are the key parameters affecting the heat transfer rate. An improved correlation was put forward to calculate the air-side heat transfer coefficient, being able to predict 90% of the experimental data within the ±10% error bounds. Also, it was noticed that the condenser design can be optimized by reducing the wires and tubes mass for a given heat duty.

考虑家用制冷行业当前设计的几何范围，本文研究了自然通风管式自然冷凝器的传热性能。在具有设定空气侧条件的标准化气候室内，制造并测试了五十四种具有不同几何形状的样品，同时使用专用设备通过严格控制进口温度和质量流量的方式使热盐水循环通过盘管。率。结果表明，冷凝器高度，金属丝和管子的间距是影响传热速率的关键参数。提出了一种改进的相关性来计算空气侧传热系数，从而能够在±10％误差范围内预测90％的实验数据。也，