Thermal insulation and cost effectiveness of green-roof systems: An empirical study in Hong Kong
Thermal insulation and cost effectiveness of green-roof systems: An empirical study in Hong Kong
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DOI：
10.1016/j.buildenv.2016.09.032
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发表时间：
2016-12
影响因子：
7.4
通讯作者：
V. Tam;Jiayuan Wang;K. Le
中科院分区：
文献类型：
--
作者：
V. Tam;Jiayuan Wang;K. Le
香港是一个人口稠密的城市，摩天大楼密度高，人口通常集中在30%的土地上。因此，采用摩天大楼是常见的，以最大限度地提高其容量。结果，我们的建筑环境对休憩用地和绿化的需要往往被忽视。近年来，许多建筑专业人士推广屋顶绿化系统，以增加绿色空间。本文探讨了使用绿色屋顶系统的有效性。问卷调查和访谈讨论进行。结果发现，问卷调查的受访者有兴趣实施屋顶绿化系统，并了解其环境，经济和社会效益。最后，以三个案例说明绿色屋顶的隔热效果。结果表明，绿色屋顶可以降低室内温度高达3.4 °C。然而，受访者不愿意投资大量资金用于屋顶绿化系统。建议政府应发挥主导作用，大力推广屋顶绿化系统。本文件可就绿色屋顶在香港及世界各地的使用提供意见，并着重于成本效益及隔热效果。
Hong Kong is a densely populated city with high density of skyscrapers and the population is typically concentrated on 30% of the land. The adoption of skyscrapers is therefore common to maximize its capacity. As a result, the need of open space and greenery in our built environment is thus often neglected. In recent years, many building professionals promote green-roof systems to increase green space. This paper investigates the effectiveness of using green-roof systems. Questionnaire surveys and interview discussions are conducted. It is found that the questionnaire respondents are interested in implementing green-roof systems and understanding their environmental, economical and social benefits. Three case studies are also conducted to show the effectiveness of green roofs thermal insulation. The results show that green roofs can reduce the inside temperature by up to 3.4 °C. However, the respondents were not willing to invest a large amount of money for green-roof systems. It is suggested that governments should take leading positions to promote green-roof systems. This paper can provide insights on the use of green roofs in Hong Kong and around the world focusing on cost effectiveness and thermal insulation effectiveness.