Thermal effect of vertical greening under influence of block-scale microclimate

Based on the background meteorological conditions of the local climate zone (LCZ), the study utilizes the ENVI-met and EnergyPlus terminal integrated models to evaluate the cooling, humidification and energy saving effects of vertical greening in summer and winter. The results show that the maximum cooling and humidifying differences of vertical greening are 0.16 ℃ and 1.1%, respectively, under the influence of the microclimate with the heat island effect and relative humidity difference of 1.4 ℃ and 5.3%, respectively. In summer, vertical greening energy saving is about 132 to 278 W·h/m2(5.7% to 11.7%) per day. The annual energy saving is partially offset by the increase in energy consumption in winter, and the energy saving rate is only 3.2% to 6.3%,of which 92% comes from vegetation shading, 8% comes from cooling, and the humidification has a negative impact on energy saving effects (-11%).The research results help to deepen the understanding of the mechanism of vertical greening and its energy saving potential caused by microclimate differences, and provide support for the design and application of vertical greening.