垂直绿化改善建筑室内、外热环境效果分析

Analysis on Effect of Wall Greening to Improve Indoor and Outdoor Thermal Environment

垂直绿化已成为一种节省空间的节能措施。为研究夏热冬暖地区垂直绿化改善室内热环境和周围热环境的效果,对用爬山虎绿化的建筑的内外壁温及建筑周围室外温度进行实测分析;并用CFD模拟了有、无绿化房间的辐射温度,室内空气温度,PMV、PPD热舒适性指标进行对比分析。测试结果表明,垂直绿化建筑周围热岛效应仅为0.9℃;不同朝向的有绿化墙壁比没绿化的壁面温度有不同程度的降低。效果最好的外壁温平均降低了6.8℃,内壁温平均降低了1.72℃。CFD模拟结果显示,绿化后房间空气温度和辐射温度的平均值分别降低了0.4℃和1℃;PMV-PPD也有改善,而且舒适指标的最大值也减小了。分析可得垂直绿化是一种绿色有效、主动的隔热节能方式。

Greening wall has become a space - saving energy - saving measure. The internal and external wall temperature and the surrounding outdoor temperature of green building with Boston ivy are measured and analyzed in order to study the effect of greening wall to improve the indoor and outdoor thermal environment. And the thermal comfortableness indexes as radiation temperature, indoor airtemperature, and PMV - PPD in room with or without greening is simulated with CFD software, two results are compared and analyzed. The measure results show heat island effect of building is only 0. 9 °C ; the greening wall of different orientations has lower degree than that of wall without greening. The temperatures of external wall surface, inner wall surface could be lowered to 6. 8℃ and 1. 72℃ respectively. CFD simulation results showed that the average air temperature and radiation temperature of the room were decreased by 0- 4℃ and 1℃, respectively. PMV - PPD also improved, and their maximum also reduced. Therefore this is a fact that greening wall is green,effective and active insulation energy - saving way.