Many studies investigated the energy savings of buildings with green facades for different facade orientations and structures, whereas few studies have analyzed the influence of the urban form. This study evaluates the summer cooling energy savings of full-scale facade greening at blocks with different urban forms, using an integrated simulation with ENVI-met and EnergyPlus. Six idealized urban blocks (IUBs), each with two green-facade scenarios and one baseline bare-facade scenario, are established. The hourly output cooling loads of the bare- and green-facade scenarios are used to estimate the daily energy-saving rate (DER) and daily energy savings per m² of green facades (DES). The results show that the block-scale facade greening provides a DER of 3.2–11% and a DES of 123–347 Wh/m², representing a summer cooling energy reduction of 11–31 kWh for every m² of the green facade. Among the six IUBs, the high-rise high-density site (HH) has the lowest DER and DES, and the mid-rise low-density site (ML) has the highest. A higher greening ratio (65%) results in a cumulative effect and a higher DER and DES than in the buildings with a lower greening ratio (35%). Shading provided by plants and substrates is the primary reason for the DES, whereas cooling and humidifying have relatively small influences, and a trade-off effect between the two is observed. The findings of this research can shed light on green-facade practices and building energy conservation in humid subtropical cities.

许多研究调查了具有绿色立面的建筑物在不同立面方向和结构上的节能效果，而很少有研究分析城市形态的影响。这项研究使用ENVI-met和EnergyPlus的集成仿真评估了具有不同城市形式的街区进行全比例立面绿化的夏季制冷节能量。建立了六个理想化城市街区（IUB），每个城市街区都有两个绿色立面方案和一个基线裸露面方案。裸露和绿色立面场景的每小时输出冷却负荷用于估算每日节能率（DER）和每m ²绿色立面（DES）的每日节能量。结果表明，块状外墙绿化的DER为3.2–11％，DES为123–347 Wh / m ²，表示每m ²绿色立面的夏季制冷能耗降低11–31 kWh 。在六个IUB中，高层高密度站点（HH）的DER和DES最低，中层低密度站点（ML）的最高。较高的绿化率（65％）比具有较低绿化率（35％）的建筑物具有累积效果，并具有较高的DER和DES。植物和基质提供的阴影是DES的主要原因，而冷却和加湿的影响相对较小，并且观察到两者之间的权衡效果。这项研究的发现可以为湿润亚热带城市的绿色建筑实践和建筑节能提供启示。