Study of the Convective Heat Transfer Coefficient of Different Building Envelope Exterior Surfaces

Convective heat transfer on the exterior surface of the building envelope is an important component for building energy consumption. The calculation of energy consumption depends on the convective heat transfer coefficient (CHTC) of the exterior surface of the envelope. The existing research does not fully consider the effects of the airflow field around the building on the CHTC of different envelope exterior surfaces. In this paper, the relationships between the CHTC and influence factors were investigated for the isolated building. Response surface methodology (RSM) and support vector machine (SVM) algorithms were integrated with the single building simulation to build the fitting formulas. Then, the fitting correlation between CHTC and different influencing factors was validated by the heating building simulation. The results showed that the CHTC of the building exterior surface was related to the wind velocity, wind direction and temperature difference. Additionally, the fitting formulas had good accuracy in calculating the CHTC under different conditions. The SVM algorithm (averaged error: 3.34%) performed slightly better than the RSM algorithm (averaged error: 4.84%).

建筑围护结构外表面的对流换热是建筑能耗的一个重要组成部分。能耗的计算取决于围护结构外表面的对流换热系数（CHTC）。现有的研究没有充分考虑建筑物周围气流场对不同围护结构外表面的对流换热系数的影响。本文针对孤立建筑物研究了对流换热系数与影响因素之间的关系。将响应面法（RSM）和支持向量机（SVM）算法与单体建筑模拟相结合，建立拟合公式。然后，通过采暖建筑模拟验证了对流换热系数与不同影响因素之间的拟合相关性。结果表明，建筑物外表面的对流换热系数与风速、风向和温差有关。此外，拟合公式在计算不同条件下的对流换热系数时具有良好的准确性。支持向量机算法（平均误差：3.34%）比响应面法算法（平均误差：4.84%）的表现略好。