[摘　要]　分析华盛顿市绿色屋顶的环境效应（截留降水、节能、改善空气质量），对比绿色屋顶和传统屋顶的现值（PV），结果表明，在华盛顿市绿色规划下，40年后整个城市系统绿色屋顶的现值将比传统屋顶低30%-42%，相比单个建筑物范围又降低了3%-5%；同时绿色屋顶的投资回收期最快可以达到6-7年，相比单个建筑物范围提前1-2年。

[关键词]　绿色屋顶, 现值, 投资回收期, 城市范围, 单个建筑物范围

Abstract:  Estimates stormwater retention, energy savings, and air quality improvement benefits for green roofs at community-scale in Washington, D.C., and incorporates these benefits into present value (PV) to make a comparative analysis with the conventional roofs. The results demonstrate that the PV of green roofs is 30%-42% less than that of conventional roofs at community-scale over 40 years, further reduces by 3%-5% comparing to that at building-scale. Lastly, the return period of investment of green roofs is expected at 6-7 years at community-scale, and further shortens 1-2 years comparing to that at building-scale.

Key words: green roof; present value(PV); return period of investment; community-scale; building-scale

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建筑经济，2013（2）：71-74