SIMULATION ANALYSIS AND DESIGN OPTIMIZATION OF CAMPUS OUTDOOR THERMAL ENVIRONMENT UNDER COMPOUND ENERGY SUPPLY SYSTEM

In order to solve the problem of quantitative analysis of the impact of greening facilities on outdoor near-ground temperature, the author proposed the simulation analysis and design optimization of campus outdoor thermal environment under the compound energy supply system. On the basis of UAV aerial survey data, ENVI-met was used to establish two schemes of actual and non-vegetation in the study area, and the thermal environment was simulated and compared. The experimental results show that: UAV tilt photography can quickly obtain orthophoto images and high precision 3-D information of the research area, and ENVI-met modelling is more flexible and cheaper. The correlation coefficient between the results and the measured results is >0.9, and the root mean square error is 0.6 degrees C, the simulation results can reflect the distribution of temperature in the study area well. Vegetation and turf had obvious cooling effect, the area of high temperature area (>36 degrees C) in the study area without vegetation increased by 34%, the area of predicted mean vote (PMV > 4.5), which is an evaluation index of human thermal response (cold and heat sensation), increased by 17%. In the vertical direction, the cooling effect of vegetation on the ground can be extended to 15 m. In conclusion vegetation and greenery can reduce the temperature near the ground through transpiration, effectively improve the urban thermal environment, and improve human comfort.