Comfort and energy savings with active green roofs
Comfort and energy savings with active green roofs
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DOI：
10.1016/j.enbuild.2014.07.055
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发表时间：
2014-10-01
影响因子：
6.7
通讯作者：
Berardi, Umberto
中科院分区：
文献类型：
--
作者：
La Roche, Pablo;Berardi, Umberto
许多气候条件不同的国家都提出了绿色屋顶的节能建议。然而，它们的制冷和供热潜力很大程度上取决于气候和建筑特征。特别是，与传统屋顶相比，绿色屋顶的热容量增加，如果不进行保温控制，可能会导致更高的制冷和供热负荷。本文讨论了采用可变保温策略的绿化屋面的节能潜力。开发了一个系统，包括位于绿色屋顶和下面房间之间的正压送风系统，以及一个传感器控制的风扇，将绿色屋顶质量与室内环境耦合(或解耦)。风扇的启动和停止使用基于温度的规则；只有当风扇工作时，才会对正压送风系统进行通风，从而创建了一个可变的绝缘系统。四个隔热传统屋顶、非隔热绿色屋顶、隔热绿色屋顶和可变隔热系统的绿色屋顶已在炎热干燥的气候下进行了多年的测试。本文对不同的真空室控制算法进行了比较和讨论。结果尤其令人振奋，因为可变隔热系统被证明有效地调节了屋顶的热容量。夏季，无保温的绿色屋面和可变保温系统的绿色屋顶室内温度最低；冬季，保温的传统屋顶和可变保温的绿色屋顶系统的室内温度最高。因此，测量结果与模拟结果进行了比较。最后，对新型屋面绿化系统的节能潜力进行了评价。爱思唯尔出版公司(Elsevier B.V.)
Green roofs have been proposed for energy saving purposes in many countries with different climatic conditions. However, their cooling and heating potential strongly depends on the climate and building characteristics. In particular, the increase of the thermal capacity of green roofs compared to traditional roofs, if not controlled with insulation, may lead to higher cooling and heating loads. This paper discusses the energy saving potential of green roofs adopting a variable insulation strategy. A system consisting of a plenum located between a green roof and the room underneath and a sensor-operated fan that couples (or decouples) the green roof mass with the indoor environment was developed. The fan is activated and stopped using temperature based rules; the plenum is ventilated only when the fan works, creating a variable insulation system. Four cells with an insulated traditional roof, a non-insulated green roof, an insulated green roof, and a green roof with the variable insulation system have been tested in a hot and dry climate with mild winters over several years. This paper compares and discusses different plenum control algorithms. Results are particularly promising because the variable insulating system proved to adjust the thermal capacity of the roof effectively. In summer, the non-insulated green roof and the green roof with variable insulation system achieved the lowest indoor temperature; in winter, the insulated traditional roof and the variable insulation green roof system achieved the highest indoor temperatures. Measurements are hence compared with simulations. Finally, the energy saving potential of the new green roof system is evaluated. Published by Elsevier B.V.