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Application of double glazed façades with horizontal and vertical louvers to increase natural air flow in office buildings
Energy ( IF 9 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.energy.2020.117486
Nasrin Pourshab , Mehdi Dadkhah Tehrani , Davood Toghraie , Sara Rostami

Abstract The results of previous researches clearly indicate that the main concern in applying double skin facades (DSF) is overheating of the cavity and increasing the cooling energy consumption in warm seasons. The present study intends to consider the excessive heat trapped between two skins of double glazed facades in hot arid climates as a driving force to reinforce the natural airflow across the floors of an office building. To meet this purpose, numerical simulation of airflow and heat transfer inside the cavity of the double glazed facades and the adjacent floors, as well as the effect of different types of solar shading systems in horizontal and vertical modes on the airflow has been investigated using the CFD technique. The results show that the stack effect formed inside the cavity has enough power for air suction from the floors of the building and reinforcement of the natural airflow. The type of shading device has a significant effect on the airflow behavior and the heat transfer rate in the facade. In double skin facades with horizontal louvers, the buoyancy forces inside the cavity are stronger and the ventilation rate in the building floors is higher than the model with vertical louvers. On the other hand, due to the stronger convective flow in the cavity with horizontal louvers, the heat flux on the interior glass is higher than the cavity with vertical louvers and part of the heat inside the cavity is transmitted through the interior skin to the occupied spaces.

中文翻译:

应用带有水平和垂直百叶窗的双层玻璃幕墙增加办公楼的自然空气流动

摘要 前人的研究结果清楚地表明,应用双皮外墙(DSF)的主要问题是空腔过热和温暖季节增加的冷却能耗。本研究旨在考虑在炎热干旱气候下双层玻璃幕墙的两层表皮之间存在的过多热量,作为加强办公楼楼层自然气流的驱动力。为了达到这个目的,双层玻璃幕墙和相邻楼层的空腔内的气流和热传递的数值模拟,以及水平和垂直模式下不同类型的遮阳系统对气流的影响已经使用CFD 技术。结果表明,空腔内部形成的烟囱效应有足够的动力从建筑物的地板吸入空气并加强自然气流。遮阳装置的类型对立面的气流行为和传热率有显着影响。在具有水平百叶窗的双层幕墙中,空腔内部的浮力更强,建筑楼层的通风率高于具有垂直百叶窗的模型。另一方面,由于具有水平百叶窗的空腔内对流更强,内部玻璃上的热通量高于具有垂直百叶窗的空腔,并且空腔内部的部分热量通过内部蒙皮传递给被占用者。空间。遮阳装置的类型对立面的气流行为和传热率有显着影响。在具有水平百叶窗的双层幕墙中,空腔内部的浮力更强,建筑楼层的通风率高于具有垂直百叶窗的模型。另一方面,由于具有水平百叶窗的空腔内对流更强,内部玻璃上的热通量高于具有垂直百叶窗的空腔,并且空腔内部的部分热量通过内部蒙皮传递给被占用者。空间。遮阳装置的类型对立面的气流行为和传热率有显着影响。在具有水平百叶窗的双层幕墙中,空腔内部的浮力更强,建筑楼层的通风率高于具有垂直百叶窗的模型。另一方面,由于具有水平百叶窗的空腔内对流更强,内部玻璃上的热通量高于具有垂直百叶窗的空腔,并且空腔内部的部分热量通过内部蒙皮传递给被占用者。空间。空腔内的浮力更强,建筑楼层的通风率高于垂直百叶窗模型。另一方面,由于具有水平百叶窗的空腔内对流更强,内部玻璃上的热通量高于具有垂直百叶窗的空腔,并且空腔内部的部分热量通过内部蒙皮传递给被占用者。空间。空腔内的浮力更强,建筑楼层的通风率高于垂直百叶窗模型。另一方面,由于具有水平百叶窗的空腔内对流更强,内部玻璃上的热通量高于具有垂直百叶窗的空腔,并且空腔内部的部分热量通过内部蒙皮传递给被占用者。空间。
更新日期:2020-06-01
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