夏热冬冷地区双层玻璃幕墙数值模拟研究

发布时间：2018-07-25 07:18

【摘要】：双层玻璃幕墙作为一种新兴的建筑围护结构形式,具有良好的通透性,强烈的艺术美感等特点。同时双层玻璃幕墙优越的节能性使其近年来备受建筑师和投资者的推崇。但是由于缺乏相关的理论指导,许多双层玻璃幕墙在设计使用时仅仅注重艺术美感而忽视了其在建筑节能中的巨大潜力,造成了能耗的巨大浪费。本文以夏热冬冷地区的某双层玻璃幕墙建筑为例,对其进行热工性能的研究。借助CFD模拟软件对该双层玻璃幕墙的热通道内温度场和速度场进行数值模拟,分析了热通道宽度、百叶位置和进出风口尺寸对双层玻璃幕墙热工性能的影响。同时本文还对不同天气情况下热通道内温度的分布进行了现场实测,对比了模拟结果和实测数据,以验证数值模拟结果的可靠性。通过计算得出夏季时随着热通道的宽度从0.2m增加到0.5m时,热通道内气流的温度和速度逐渐减小;宽度从0.6m增加到0.9m时,靠近外侧玻璃气流温度有所升高,速度基本趋于稳定。进出风口高度从0.1m增加到0.45m时,热通道内的气流温度逐渐减小,速度逐渐增大;进出风口高度为0.45~0.6m时,热通道的气流温度趋于稳定,速度逐渐减小。遮阳百叶位于靠近外侧玻璃和热通道中间位置时,通道内流场的温度和速度分布较靠近内侧玻璃时更加均匀。对比夏季的模拟结果和实测数据发现,晴天工况下的热通道温度分布模拟结果和实测数据基本吻合,说明数值模拟结果具有一定的可靠性。冬季时,热通道出现明显的温度分层现象:上部空气的温度高,下部空气的温度较低;并且热通道内空气以遮阳百叶为中心,形成“环状气流”,且随着热通道宽度从0.2m增加到0.9m,热通道内平均温度逐渐升高并趋于稳定。因此适当增大热通道宽度能够使建筑表面的温度增加,从而降低建筑围护结构热负荷,达到节约能耗的目的。
[Abstract]:Double-layer glass curtain wall as a new type of building envelope structure, with good permeability, strong artistic aesthetic and other characteristics. At the same time, double-layer glass curtain wall has been praised by architects and investors in recent years because of its superior energy efficiency. However, due to the lack of relevant theoretical guidance, many double-layer glass curtain wall design only pay attention to the aesthetic sense of art and ignore its great potential in building energy saving, resulting in a huge waste of energy consumption. This paper takes a double-layer glass curtain wall building in hot summer and cold winter area as an example to study its thermal performance. The temperature field and velocity field in the thermal channel of the double-layer glass curtain wall were numerically simulated by CFD software. The influence of the width of the heat channel, the position of the shutter and the size of the inlet and outlet on the thermal performance of the double-layer glass curtain wall was analyzed. In order to verify the reliability of the numerical simulation, the temperature distribution in the heat channel is measured in different weather conditions, and the simulation results and the measured data are compared. The results show that when the width of the hot channel increases from 0.2m to 0.5m in summer, the temperature and velocity of the air flow in the hot channel gradually decrease, and when the width increases from 0.6m to 0.9m, the temperature of the glass flow near the outer side increases and the velocity tends to be stable. When the inlet and outlet height increases from 0.1 m to 0.45 m, the air flow temperature in the hot channel decreases and the velocity increases gradually, while when the inlet and outlet height is 0.45 ~ 0.6 m, the air flow temperature tends to stabilize and the velocity decreases gradually. The temperature and velocity distribution of the flow field in the shaded louver is more uniform than that near the inner glass when it is located near the middle of the outer glass and the hot channel. By comparing the simulated results with the measured data in summer, it is found that the simulation results of heat channel temperature distribution under sunny conditions are in good agreement with the measured data, which indicates that the numerical simulation results are reliable. In winter, there are obvious temperature stratification phenomena in the heat channel: the temperature of the upper air is high, the temperature of the lower air is lower, and the air in the heat channel is centered on shading the shutters, forming a "annular flow". With the increase of the width of the heat channel from 0.2m to 0.9m, the average temperature of the channel increases gradually and tends to be stable. Therefore, increasing the width of heat passage can increase the temperature of the building surface, reduce the heat load of the building envelope structure, and achieve the purpose of saving energy consumption.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU228;TU111.3

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