太阳辐射直散分离模型比较研究—以北京地区为例
Comparison of the fraction model of direct and diffuse solar radiation—Taking Beijing area as an example

在建筑能耗模拟与太阳能建筑系统设计中，逐时的太阳直射和散射气象数据是最重要的基本参数。由于中国辐射观测数据的缺失，逐时直射和散射数据很难获得。很多学者对此进行了研究，提出了数十种直散分离模型。采用北京地区2009年—2011年3年太阳总辐射和散射实测数据，选取Erbs模型、Orglill模型、清华大学随机气象模型、宇田川光弘模型、张晴原模型5个代表性的直散分离模型进行计算验证，分析比较了实测数据和计算数据之间的相关系数R、均方根误差RMSE和相对误差RE，得出晴空指数Kt可以作为最主要的影响因子，Erbs模型预测散射的准确率最高，其次为张晴原模型和Orglill and Hollands模型。
In the simulation of building energy consumption and solar energy system design, hourly direct and diffuse radiation is one of the most important basic parameters.While, due to Chinese solar radiation data missing, it is difficult to obtain hourly direct and diffuse radiation data. Many domestic and foreign scholars has studied and put forward several diffuse radiation models. 2009-2011 year's measured data of total solar radiation and diffuse radiation were scleted and five typical separation models, that is Erbs model, Orglill and Hollands model,stochastic climatic model, Zhang Qingyuan model，were put to analyze and compare the measured data and the simulation data between the correlation coefficient, root mean square error and relative error. Found that Erbs model predicts diffuse radiation with the highest accuracy, followed by the Zhang Qingyuan model and Orglill and Hollands model, Clearness index Kt can be used as the main influence factor.