## 3 Results and Discussions  
### Analysis on Experimental Results  
#### 3.1.1 Analysis of Microclimate Results of Experiments for Moving Lines of Streets  
ENVI-met software was used to calculate the PET values for the east-west street perpendicular to the dominant wind direction (Model 1), the north-south street parallel to the dominant wind direction (Model 2), and the multi-line \"cross\"-shaped street (Model 3). At the study time of 2:00 p.m., a comparison was made among the microclimate environment characteristics of the three kinds of streets. It was calculated that the average PET value in the street perpendicular to the dominant wind direction in Model 1 was 55.13 \({}^{\circ}\)C; the average PET value in the street parallel to the dominant wind direction in Model 2 was 49.09 \({}^{\circ}\)C; and the average PET value in the \"cross\"-shaped street in Model 3 was 53.1 \({}^{\circ}\)C.  
Figure 8: Design of experiment for greening layout.  
Figure 9: Three-dimensional diagram of each model in study 3.  
From the previous analysis on the corresponding relationship between PET and human senses (Figure 2), it is evident that in summer, the higher the PET value is, the hotter and the more uncomfortable the microclimate environment will be. Therefore, it can be concluded that the average comfort is the best for the street parallel to the dominant wind direction (Model 2), followed by the multi-line \"cross\"-shaped street (Model 3), and finally the street perpendicular to the dominant wind direction (Model 1).  
Then, from an analysis of the calculated proportion of the PET values in each section of the street (Figure 10) and the distribution diagram of the PET values at 1.0 m (Figure 11), it is evident that when the street is a single-line type and when the entire street is perpendicular to the dominant wind direction (Model 1), the comfort of the microclimate is poor. When the street is a multi-line type, part of the street is perpendicular to the dominant wind direction and part of the street is parallel to the dominant wind direction (Model 3), the comfort of the microclimate is at a medium level. When the street is a single-line type and the entire street is parallel to the dominant wind direction (Model 2), the comfort of the microclimate is the best. This is because when cooling facilities (greening) are established at the entrance and inside of the street, the airflow entering the street has a cooling effect. The street parallel to the dominant wind direction can form a smooth ventilation corridor, and the microclimate environment within the entire street is relatively comfortable. When the street flow line is in a \"cross\" shape, only half of the street is in the unobstructed airflow, while the other half is shielded by buildings, resulting in slightly poorer airflow mobility. Therefore, the advantages and disadvantages of the microclimate environment are significantly impacted by spatial distribution. The microclimate environment is better in areas with unobstructed airflow, while it is worse in areas with unobstructed airflow. When the street is perpendicular to the dominant wind direction, there is no unobstructed airflow passage due to the shielding of buildings, so the microclimate environment in the street is poor. It can be concluded that maintaining a smooth airflow passage is very important for improving the microclimate environment of commercial streets.