基于多因素协同效应的双层通风幕墙非稳态热特性研究

发布时间：2018-05-28 05:12

本文选题：夏热冬冷地区 + 双层通风幕墙　；参考：《湖南工业大学》2016年硕士论文

【摘要】：双层通风幕墙(Double Skin Fa?ade,以下简称DSF)作为一种近些年不断发展的建筑外围护结构,已经给人们留下了深刻的印象,其外观满足人们对于美学的追求,良好的通透性也能够满足室内采光的需要,最重要的是在提高热工性能方面具有较大潜力,特别是在我国夏热冬冷地区,如果合理的布置进出风口的开合情况,就可以有效的减小夏季的制冷能耗和冬季的采暖能耗。然而,DSF的传热过程非常复杂,要想设计出适应当地气候的DSF,需要对DSF热通道内的热工性能有全面的认识。本文首先运用理论分析的方法,深入研究分析了DSF的传热过程,建立了DSF的动态传热模型,列出了每一分界面上的热平衡方程;同时介绍了DSF热通道内自然通风的形成原因,指出热通道高度是影响DSF自然通风的重要因素。借助CFD模拟软件和WINDOW软件对夏季工况下外循环式DSF进行模拟研究,采用太阳加载模型来模拟不同时刻的太阳辐射强度、太阳高度角和太阳方位角,得出在夏季辐射强度较大的白天时段内,热通道的动态隔热效率基本能达到90%以上,能够有效的降低热通道内的高温对室内环境的热扰动。运用数值模拟的方法,从遮阳百叶位置、遮阳百叶倾角和热通道间距3个方面对DSF的结构参数进行优化,结果表明热通道间距对DSF的传热性能影响最大。最后,以2016年2月29日为实验日,将实验结果与数值模拟结果进行对比分析,指出本文所建立数学模型对预测DSF温度分布趋势方面具有一定可靠性,但是模拟值与实验值之间存在误差,通过分析总结出了造成误差的几点原因。本文在DSF的原理与性能上做了分析,同时结合数值模拟与实验,研究了DSF热通道内的非稳态热特性,对夏热冬冷地区DSF的性能分析和优化设计具有一定的参考意义。
[Abstract]:Double Skin facade (DSF), as a kind of building envelope structure which has been developing in recent years, has left a deep impression on people, and its appearance satisfies people's pursuit of aesthetics. Good permeability can also meet the needs of indoor lighting. The most important thing is that it has great potential in improving thermal performance, especially in the hot summer and cold winter areas of China, if the opening and closing of the air inlet is reasonably arranged. It can effectively reduce the cooling energy consumption in summer and heating energy consumption in winter. However, the heat transfer process of DSF is very complex. To design DSFs adapted to local climate, it is necessary to have a comprehensive understanding of the thermal properties of DSF heat channels. In this paper, the heat transfer process of DSF is studied and analyzed by the method of theoretical analysis, the dynamic heat transfer model of DSF is established, the heat balance equation at each interface is listed, and the reasons for the formation of natural ventilation in DSF heat channel are introduced. It is pointed out that the heat channel height is an important factor affecting the natural ventilation of DSF. With the help of CFD simulation software and WINDOW software, the external circulation DSF is simulated in summer. The solar radiation intensity, solar height angle and solar azimuth at different times are simulated by solar loading model. It is concluded that the dynamic thermal insulation efficiency of the heat channel can reach more than 90% during the daytime period when the summer radiation intensity is large, which can effectively reduce the thermal disturbance caused by the high temperature in the heat channel to the indoor environment. The structural parameters of DSF were optimized by numerical simulation from three aspects: the position of sunshade blinds, the obliquity of sunshade blinds and the distance between heat channels. The results show that the distance between heat channels has the greatest influence on the heat transfer performance of DSF. Finally, taking February 29, 2016 as the experimental day, the experimental results and the numerical simulation results are compared and analyzed. It is pointed out that the mathematical model established in this paper is reliable in predicting the trend of DSF temperature distribution. However, there are some errors between the simulated value and the experimental value. In this paper, the principle and performance of DSF are analyzed. At the same time, combined with numerical simulation and experiment, the unsteady-state thermal characteristics of DSF heat channel are studied, which has some reference significance for the performance analysis and optimization design of DSF in hot summer and cold winter area.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU227;TU834

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