Convective Heat Transfer Coefficient (CHTC) is a determining factor in building energy simulation (BES) tools for building thermal calculations. The accuracy of CHTC calculation has a direct effect on building energy analysis.This study aims to assess the impact of multiple parameters, namely temperature difference, wind speed, and wind direction on CHTC of building exterior surfaces. Then the overall high accuracy correlation based on these parameters for CHTC is provided. According to the specified values for temperature and velocity, Richardson’s number range from 0.1 to 10, representing a mixed heat transfer. The simulated results are compared with a wind tunnel experiment for validation. The standard k-epsilon model is used for turbulence simulation. Several cases are numerically simulated, considering various velocities, wind directions, and temperature differences. Results indicate that the studied parameters could be ranked as velocity, building orientation, and temperature difference in the order of effectiveness. All of the correlations used in EnergyPlus software for the exterior surface of the building are compared with the presented correlation and simulated data. The comparison shows that the proposed expression could predict CHTC for various angles, velocities, and temperature differences with an error of below 3%.

对流传热系数（CHTC）是用于建筑热量计算的建筑能量模拟（BES）工具中的决定因素。CHTC计算的准确性直接影响建筑能耗分析。本研究旨在评估温度差，风速和风向等多个参数对建筑外表面CHTC的影响。然后提供了基于这些参数的CHTC的总体高精度相关性。根据温度和速度的指定值，Richardson的数值范围从0.1到10，表示混合传热。将模拟结果与风洞实验进行比较以进行验证。标准的k-ε模型用于湍流模拟。考虑了各种速度，风向，和温差。结果表明，所研究的参数可以按照有效性的顺序排列为速度，建筑物方向和温度差。将EnergyPlus软件中用于建筑物外表面的所有相关性与提供的相关性和模拟数据进行比较。比较表明，所提出的表达式可以预测各种角度，速度和温度差下的CHTC，误差低于3％。