【摘要】：雙層玻璃幕墻作為一種新興的建筑圍護結(jié)構(gòu)形式,具有良好的通透性,強烈的藝術(shù)美感等特點。同時雙層玻璃幕墻優(yōu)越的節(jié)能性使其近年來備受建筑師和投資者的推崇。但是由于缺乏相關(guān)的理論指導,許多雙層玻璃幕墻在設(shè)計使用時僅僅注重藝術(shù)美感而忽視了其在建筑節(jié)能中的巨大潛力,造成了能耗的巨大浪費。本文以夏熱冬冷地區(qū)的某雙層玻璃幕墻建筑為例,對其進行熱工性能的研究。借助CFD模擬軟件對該雙層玻璃幕墻的熱通道內(nèi)溫度場和速度場進行數(shù)值模擬,分析了熱通道寬度、百葉位置和進出風口尺寸對雙層玻璃幕墻熱工性能的影響。同時本文還對不同天氣情況下熱通道內(nèi)溫度的分布進行了現(xiàn)場實測,對比了模擬結(jié)果和實測數(shù)據(jù),以驗證數(shù)值模擬結(jié)果的可靠性。通過計算得出夏季時隨著熱通道的寬度從0.2m增加到0.5m時,熱通道內(nèi)氣流的溫度和速度逐漸減小;寬度從0.6m增加到0.9m時,靠近外側(cè)玻璃氣流溫度有所升高,速度基本趨于穩(wěn)定。進出風口高度從0.1m增加到0.45m時,熱通道內(nèi)的氣流溫度逐漸減小,速度逐漸增大;進出風口高度為0.45~0.6m時,熱通道的氣流溫度趨于穩(wěn)定,速度逐漸減小。遮陽百葉位于靠近外側(cè)玻璃和熱通道中間位置時,通道內(nèi)流場的溫度和速度分布較靠近內(nèi)側(cè)玻璃時更加均勻。對比夏季的模擬結(jié)果和實測數(shù)據(jù)發(fā)現(xiàn),晴天工況下的熱通道溫度分布模擬結(jié)果和實測數(shù)據(jù)基本吻合,說明數(shù)值模擬結(jié)果具有一定的可靠性。冬季時,熱通道出現(xiàn)明顯的溫度分層現(xiàn)象:上部空氣的溫度高,下部空氣的溫度較低;并且熱通道內(nèi)空氣以遮陽百葉為中心,形成“環(huán)狀氣流”,且隨著熱通道寬度從0.2m增加到0.9m,熱通道內(nèi)平均溫度逐漸升高并趨于穩(wěn)定。因此適當增大熱通道寬度能夠使建筑表面的溫度增加,從而降低建筑圍護結(jié)構(gòu)熱負荷,達到節(jié)約能耗的目的。
[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.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU228;TU111.3

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