The condensation heat transfer and pressure drop characteristics of R600a in a multi-louvered fins compact heat exchanger were studied in detail. Experiments were carried out at saturation pressures from 530 to 620 kPa, mass fluxes from 25 to 41.25 kg∙(m²∙s)⁻¹, air temperature from 25 to 35 °C and inclined angles from 0° to 180° in horizontal and vertical directions, respectively. The effects of mass flux, saturation pressure, air temperature, and inclined angle were analyzed and discussed. The results indicated that both heat transfer coefficient and pressure drop increased with the increase of mass flux and decreased with the increase of saturation pressure. Both heat transfer coefficient and pressure drop were significantly affected by the inclined angle, while the heat transfer capacity of the condenser was almost independent of the inclined angle. The experimental data were compared with several well-known condensation heat transfer models. Based on analysis results, the modified method to calculate the logarithmic average temperature difference was proposed. This predicted method could decrease the deviations of those models by 15%. In addition, the improved correlations for heat transfer and friction factor were proposed and predicted the present experimental data well with 90% of the data points within the bandwidth of ±15% and ±12%, respectively.

详细研究了R600a在多百叶翅片紧凑型换热器中的冷凝传热和压降特性。实验在 530 至 620 kPa 的饱和压力、25 至 41.25 kg∙(m ² ∙s) ^{-1 的}质量通量下进行, 空气温度为 25 至 35°C，水平和垂直方向的倾斜角分别为 0° 至 180°。分析讨论了质量通量、饱和压力、气温和倾斜角的影响。结果表明，传热系数和压降都随着质量流量的增加而增加，随着饱和压力的增加而减少。传热系数和压降均受倾斜角度的显着影响，而冷凝器的传热能力几乎与倾斜角度无关。实验数据与几个著名的冷凝传热模型进行了比较。根据分析结果，提出了计算对数平均温差的修正方法。这种预测方法可以将这些模型的偏差降低 15%。此外，还提出了改进的传热和摩擦系数相关性，并很好地预测了当前的实验数据，其中 90% 的数据点分别位于 ±15% 和 ±12% 的带宽内。