Envelope parameter of the building.

Plum Rains Season (PRS) has the typical characteristics of outdoor air temperature dramatic changes and high air humidity in the hot summer and cold winter region in China. When the outdoor temperature rises rapidly during PRS, the building envelope surface temperature is probably lower than the indoor air dew point temperature, resulting in moisture condensation. This paper evaluates the influence of geographical location and outdoor meteorological parameters on the indoor humidity environment. The effects of critical parameters such as altitude, average temperature, relative humidity, total precipitation, total precipitation days, atmospheric pressure, and wind speed on the building envelope moisture condensation in nine typical cities in the hot summer and cold winter region were simulated and analyzed. The results show that the Condensation Frequency (CFn) in the western, central, and eastern regions reached the highest in April, May, and June, respectively. Among the nine typical cities, Changsha has the highest Condensation Risk (CR). In addition, the altitude, total precipitation, and atmospheric pressure have little effect on the indoor humidity environment, and it is not directly related to CR; The average temperature and total precipitation days were not related to CR in the western and eastern regions and positively correlated with CR in the central region; The wind speed was positively correlated with CR in the western and central regions and negatively correlated in the eastern region; The relative humidity can affect the indoor humidity environment and moisture condensation on the inner surface of walls, when the relative humidity increases, the CR increases.

梅雨季节（Plum Rains Season，PRS）具有中国夏热冬冷地区户外气温剧变、空气湿度偏高的典型特征。当梅雨季节期间户外气温快速升高时，建筑围护结构表面温度可能低于室内空气露点温度，进而引发结露现象。本研究针对地理区位与户外气象参数对室内湿度环境的影响展开评估。针对夏热冬冷地区9座典型城市，本研究对海拔、平均气温、相对湿度、总降水量、降水日数、大气压强以及风速等关键参数对建筑围护结构结露的影响进行了模拟与分析。研究结果表明，结露频次（Condensation Frequency，CFn）在西部、中部、东部地区的峰值分别出现在4月、5月与6月。在9座典型城市中，长沙的结露风险（Condensation Risk，CR）最高。此外，海拔、总降水量与大气压强对室内湿度环境影响微弱，且与结露风险无直接关联；平均气温与降水日数在西部、东部地区与结露风险无关联，但在中部地区与结露风险呈正相关；风速在西部与中部地区与结露风险呈正相关，而在东部地区则呈负相关；相对湿度会影响室内湿度环境与墙体内表面结露情况，相对湿度升高时结露风险也随之提升。