基于晴空指数的南昌地区建筑外墙的传热得热量预测模型

Prediction Model of Heat Gain by Heat Transfer of Building Exterior Wall in Nanchang Area Based on Clear Sky Index

采用数值模拟的方法,以晴空指数为表征室外温度和太阳辐射的参数,研究了夏季不同气象条件下江西南昌地区建筑南墙的传热得热量。结果表明,南墙内表面和外表面的温度随晴空指数的增大而升高,通过单位面积南墙的最大传热得热量以及南墙日得热总量也均随晴空指数的增大而升高,但其增长速率随晴空指数的增大趋于平缓,表明南墙的传热得热量与晴空指数之间为非线性关系。研究结果还显示,用Rational函数拟合晴空指数与南墙的传热得热量之间的关系,拟合方程的决定系数R^(2)在0.99以上,表明该拟合模型可用于预测南昌地区居住建筑南外墙在不同天气状况下的传热得热量。

Taking the clear sky index as the parameter to represent outdoor temperature and solar radiation,numerical simulation studies the heat gain by heat transfer of the south wall of buildings in Nanchang,Jiangxi Province under different meteorological conditions in summer.The results show that the temperature of the inner and outer surfaces of the south wall rises with the increase of the clear sky index.In addition,with the increase of the clear sky index,the maximum heat transfer and daily heat gain per unit area of the south wall increase,but the growth rate tends to be gentle with the increase of the clear sky index.Showing that there is a nonlinear relationship between the heat transfer of the south wall and the clear sky index.The results also show that the rational function is used to fit the relationship between the clear sky index and the heat gain by heat transfer of the south wall.And the determination coefficient R^(2) of the fitting equation is above 0.99,showing that the fitting model can predict the heat gain by heat transfer of the south wall of residential buildings in Nanchang under different weather.