摘要
绿化屋顶在节能设计中以附加当量热阻增大屋顶总热阻值,有效减少由屋顶进入室内的热量,降低室内空气温度。但根据已有的实验研究,绿化屋顶隔热特性与室内气温是耦合关系,随室内气温的变化,绿化屋顶会呈现出不同的隔热特性。用实验测试与数值模拟相结合的方法,分析在不同室内气温下绿化屋顶、参照屋顶与等效保温屋顶内表面温度与热流的变化。结果表明:室内气温会显著改变绿化屋顶的隔热性能,其当量热阻为与室内温度正相关的变量。在被动式建筑中,绿化屋顶更能充分发挥隔热功效,且具有不向室内传热的特性。
Green roof contributes to high total thermal resistance of roof serving as additional equivalent thermal resistance ,which effectively reduces the heat gain from roof and lowers the indoor air temperature . However ,current studies showed that the relationship of indoor temperature and thermal performance was coupling and the performance of the green roof are different with the change of the indoor temperature . Surface temperature and heat flux changes of green roof ,reference roof and equivalent insulating roof were analyzed respectively w hen the indoor temperature changed using both experiment and numerical simulation . The results showed that the indoor temperature had significant impact on the insulation performance of green roof and the equivalent thermal resistance had positive correlationwith the indoor temperature .The insultation performance of green roof reduces heat gain in passive building .Key words ：green roof ;equivalent thermal resistance ;numerical simulation .
出处
《土木建筑与环境工程》
CSCD
北大核心
2015年第2期109-114,共6页
Journal of Civil,Architectural & Environment Engineering
基金
重庆市科委前沿与应用基础研究(cstc2014jcyjA90024)
中央高校基本科研业务费(106112014CDJZR190008)~~
关键词
绿化屋顶
当量热阻
数值模拟
green roof
equivalent thermal resistance
numerical simulation
