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Experimental and numerical analysis of thermal performance and energy consumption of ventilated green roof
Energy and Buildings ( IF 6.6 ) Pub Date : 2025-01-18 , DOI: 10.1016/j.enbuild.2025.115330
Yiru Chen, Liang Xiao, Hongtao Xu, Zhijun Wang, Guoxiong Mei, Mingjie Jiang, Shan Huang
Energy and Buildings ( IF 6.6 ) Pub Date : 2025-01-18 , DOI: 10.1016/j.enbuild.2025.115330
Yiru Chen, Liang Xiao, Hongtao Xu, Zhijun Wang, Guoxiong Mei, Mingjie Jiang, Shan Huang
In this study, a new green roof structure with bottom ventilation is proposed to deal with the heat-sink effect of green roof during the night period. The effect of ventilation on the thermal performance of green roofs are investigated by experimental and numerical analyses. The results indicate that, in summer, the nighttime heat dissipation capacity of the ventilated green roof is greatly improved. The green roof with 50 mm ventilation height has the most significantly comprehensive thermal performance. The heat dissipation capacity is proportional to the opening area. As the external wind speed increases, the thermal dissipation efficiency of ventilated green roofs correspondingly improves. Under the climatic conditions of Nanning City, the heat dissipation effect caused by the increase of wind speed can be reduced in case of the wind rate is greater than 2.1 m/s. In winter, the thermal insulation effect of ventilated green roof is basically the same as that of traditional green roof. For the energy consumption performance, the ventilated green roof has the most prominent energy saving effect in residential areas, where energy consumption can be saved by about 4 %–13 % throughout the year. In the context of a subtropical monsoon climate, ventilated green roofs are deemed suitable for buildings where air conditioning operates either throughout the entire day or during the nighttime period. The research can provide reference schemes and technical support for alleviating the difficulty of heat dissipation of green roofs at night in practical projects.
中文翻译:
通风绿化屋顶热性能及能耗的实验和数值分析
本研究提出了一种新型的底部通风绿色屋顶结构,以应对绿色屋顶在夜间的散热器效应。通过实验和数值分析研究了通风对绿色屋顶热性能的影响。结果表明:夏季,通风绿化屋顶的夜间散热能力大大提高;通风高度为 50 mm 的绿色屋顶具有最显著的综合热性能。散热能力与开口面积成正比。随着外部风速的增加,通风绿化屋顶的散热效率也相应提高。在南宁市的气候条件下,在风速大于 2.1 m/s 的情况下,可以降低风速增加引起的散热效果。在冬季,通风绿化屋面的保温效果与传统绿化屋面基本相同。在能耗性能方面,通风绿化屋顶在住宅区的节能效果最为突出,全年可节省约 4 %–13 % 的能耗。在亚热带季风气候的背景下,通风绿色屋顶被认为适用于空调全天或夜间运行的建筑物。该研究可为缓解实际项目中绿化屋顶夜间散热困难提供参考方案和技术支持。
更新日期:2025-01-18
中文翻译:
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通风绿化屋顶热性能及能耗的实验和数值分析
本研究提出了一种新型的底部通风绿色屋顶结构,以应对绿色屋顶在夜间的散热器效应。通过实验和数值分析研究了通风对绿色屋顶热性能的影响。结果表明:夏季,通风绿化屋顶的夜间散热能力大大提高;通风高度为 50 mm 的绿色屋顶具有最显著的综合热性能。散热能力与开口面积成正比。随着外部风速的增加,通风绿化屋顶的散热效率也相应提高。在南宁市的气候条件下,在风速大于 2.1 m/s 的情况下,可以降低风速增加引起的散热效果。在冬季,通风绿化屋面的保温效果与传统绿化屋面基本相同。在能耗性能方面,通风绿化屋顶在住宅区的节能效果最为突出,全年可节省约 4 %–13 % 的能耗。在亚热带季风气候的背景下,通风绿色屋顶被认为适用于空调全天或夜间运行的建筑物。该研究可为缓解实际项目中绿化屋顶夜间散热困难提供参考方案和技术支持。