Difference between anisotropic and isotropic diffuse radiation models in building radiation simulation

Based on the measured radiation data of a radiation station in Shanghai, constructs shortwave radiation calculation models for building groups using the anisotropic diffuse radiation model (NADR model) and isotropic diffuse radiation model, respectively. Simulates radiation values of different buildings using Matlab. The results show that diffuse radiation simulation values under the isotropic diffuse radiation model are relatively small in all orientations for individual building. For those in building groups, diffuse radiation simulation values in all orientations are also relatively small. The difference of simulation values between two models is slightly increased as the ratio of buildings’ height and length increases. Suggests that the NADR model can be applied to simulate radiation values of a point on a wall or an entire wall.