工质在大管径通道内的流动与传热特性对于有机朗肯循环系统冷凝器设计至关重要。本文实验研究了内径为9 mm的水平光滑管内R152a在质量流速131~306 kg/（m2•s）、饱和温度303~323 K下的冷凝流动与传热特性，在实验数据与传统传热流动关联式对比基础上，对关联式进行了修正。结果表明：R152a冷凝传热系数和摩擦压降梯度在干度、质量流速和饱和温度的影响下呈现相同的变化趋势和变化幅度；质量流速增大对传热的强化作用在高干度区域更加明显；修正后的传热和摩擦压降梯度关联式对实验数据的平均预测偏差分别为5.3%和6.3%，预测精度显著提高。

The flow condensation heat transfer characteristics of the working fluid in a macrochannel are critical to the design of condenser in the organic Rankine cycle. In this paper, an experimental investigation on the flow condensation heat transfer characteristics of R152a with a mass flux of 131 to 306 kg/(m2•s) and a saturation temperature of 303 to 323 K in a horizontal smooth circular tube with 9 mm inner diameter is conducted. The comparison of experimental data and the predicted values based on traditional flow heat transfer correlations is conducted, and the correlations are revised. The result shows that the condensation heat transfer coefficient and frictional pressure drop gradient of R152a present the same change trend and amplitude under the influence of dryness, mass flux and saturation temperature. The enhanced effect of increasing mass flux on heat transfer is more obvious in the high dryness region; the mean prediction deviations of the revised correlations for heat transfer coefficient and frictional pressure drop gradient to experimental data are 5.3% and 6.3% respectively, indicating an obvious improved prediction accuracy.

TQ021.3

国家自然科学基金面上项目（51876043）；国家自然科学基金重点项目（51736005）