通过建立热模拟程序来模拟从室内空气到内表面（如墙壁和窗户）的传热，通常采用表面平均对流系数的充分搅拌假设。该方法假设室内空气温度均匀（忽略温度分层的影响），并用表面粗糙对流系数表征传热。创建了IEA附件21/Task 12双层玻璃试验室的模型，并使用充分搅拌的建模方法进行了模拟。人们发现，对房间加热能耗的预测对对流系数和房间空气假设温度都非常敏感。灵敏度非常高，因此可以得出结论，准确描述对流状态对于准确模拟IEA试验室等配置至关重要。 研究发现，模拟结果对内部对流建模比其他因素（如织物热性能建模和空气渗透）更敏感。为了响应对更精确的内表面对流算法的需求，本文提供了一种方法的建议，该方法将允许计算响应局部流动条件。单位:SICitation:研讨会，ASHRAE交易，第105卷，第页。1999年2月2日，西雅图

The well-stirred assumption with surface-averaged convection coefficients is commonly employed by building thermal simulation programs to model heat transfer from the room air to internal surfaces (such as walls and windows). This approach assumes the room air to be at a uniform temperature (the influence of temperature stratification is ignored) and characterizes the heat transfer with surfaceaveraged convection coefficients. A model of the IEA Annex 21/Task 12 double-glazed test room was created and simulations were performed using the well-stirred modeling approach. Predictions of the room's heating energy consumption were found to be highly sensitive to both convection coefficients and to the temperature assumed for the room air. The sensitivity was so great that it is concluded that an accurate characterization of the convective regime is critical in order to accurately simulate configurations like the IEA test room. The simulation results were found to be far more sensitive to internal convection modeling than to other factors, such as the modeling of fabric thermal properties and air infiltration. In response to the demonstrated need for more accurate internal surface convection algorithms, recommendations are provided on an approach that will allow calculations to be responsive to local flow conditions.Units: SI