There is a lot of rainfall in southern China, and wind-driven rain is the key influencing factor for building wall load prediction and energy consumption calculation in this region.In order to clarify the effect of wind-driven rainfall on the heat transfer of building walls, based on the meteorological data of Guangzhou, Shanghai, Haikou and Changsha from 1999 to June 2023, the wind-driven rainfall in each direction of the four cities was calculated, and the characteristics of wind-driven rainfall and the calculation results of cumulative heat transfer were analyzed. A parameter named reduction coefficient was proposed to reflect the influence of evaporative cooling on wall heat transfer, and the recommended value ranges of this coefficient were also presented. The results show that under the influence of the monsoon, the average monthly wind-driven rainfall of the south and east walls of Guangzhou, Haikou and Shanghai is large, which is basically more than 3 mm, and the wind-driven rainfall in each direction of Changsha is relatively average, about 2.17 mm. The reduction coefficient is negatively correlated with wind-driven rainfall and also affected by cumulative heat transfer. By using the distribution function, the value range of the reduction coefficient of Guangzhou and Changsha is more accurate, with 85% of the values falling within the predicted range. For Haikou and Shanghai, 92% of the values lie above the lower limit of the predicted range. The reduction factor proposed in this study can be used to consider the influence of rainfall on the heat transfer of the enclosure structure in engineering practice, which lays a foundation for further accurate energy consumption calculation.
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