倾斜面太阳辐射量计算方法研究

倾斜面辐射数据是保证准确设计太阳能利用系统的基础数据,一般由水平面数据计算得出。针对现有计算模型误差较大的现状考虑,试验测试了水平面及不同倾角斜面上的太阳辐射数据,提出了针对直接辐射转换系数的修正方法;通过倾斜面散射辐射数据的计算和分析,在散射辐射模型的基础上,建立耦合计算模型。试验与模型计算结果表明,散射辐射的各向同性受天气工况的影响,耦合模型具有较高的准确性,计算值与实测值的偏差可控制在5.3%以内。

A study of methods to calculate the solar radiation on inclined surfaces

The solar radiation data on inclined surface, which is generally calculated from horizontal data, is the basic data for ensuring the accurate design of the solar energy utilization system. Considering the present situation of large error in the existing calculation models, the solar radiation data on the horizontal and inclined surfaces with various tilt angles was tested. A correction method for the horizontal incident angle of the direct radiation was proposed. A coupled calculation model based on the diffuse radiation model is established by calculating and analyzing the diffuse radiation data on tilted surfaces. The results indicate that the isotropic of diffuse radiation are affected by weather conditions, and the coupled calculation model has higher accuracy, where the bias error is less of 5.3% between the calculated and measured values.