太阳能烟囱建筑自然通风与自然排烟性能的实验研究

发布时间：2018-02-27 22:54

本文关键词： 太阳能烟囱建筑自然排烟自然通风缩比例实验通风口高度空腔间距辐射功率火源功率　出处：《中国科学技术大学》2017年硕士论文　论文类型：学位论文

【摘要】：太阳能烟囱建筑利用太阳能烟囱结构进行自然通风,其自然通风效果优良、自然通风系统节能环保,有望成为减少建筑耗能、充分利用太阳能的有效措施之一。太阳能烟囱建筑的烟囱竖井结构如果能够用于自然排烟,既可避免机械排烟系统的资源闲置及一定的启动失效率,也可节约建筑耗能。目前关于太阳能烟囱建筑在自然排烟方面研究较少,太阳能烟囱能否兼顾自然排烟和自然通风的效果,以及如何合理的设计其结构参数目前还不清楚。因此,本文针对可同时用于自然通风和自然排烟的太阳能烟囱建筑的研究工作分为以下两个方面:(1)太阳能烟囱建筑自然通风与自然排烟建筑结构参数包括室内通风口高度、太阳能烟囱空腔间距、玻璃幕墙厚度等,其中室内通风口高度和太阳能烟囱空腔间距是影响自然通风和自然排烟的重要建筑结构参数。本文基于缩比例实验装置,研究室内通风口高度和太阳能烟囱空腔间距对太阳能烟囱建筑自然通风及自然排烟效果的影响,分析讨论室内通风口风速、窗户风速、太阳能烟囱温度分布、室内竖直温度分布及烟气运动规律,可用于指导新型太阳能烟囱建筑的建筑结构参数设置。研究结果表明,自然通风和自然排烟效果随通风口高度增加呈现先增大后减小的趋势,且最佳室内通风口高度位于窗户上檐位置附近;自然通风和自然排烟效果随太阳能烟囱空腔间距增加呈现先增大后减小的趋势。(2)辐射功率及火源功率是太阳能烟囱建筑自然通风和自然排烟性能的关键边界条件。通过研究不同辐射功率对太阳能烟囱建筑自然通风和自然排烟性能的影响规律,可以得出太阳能烟囱建筑在不同纬度或者太阳辐射功率下的性能差异。通过研究不同火源功率对太阳能烟囱建筑自然通风和自然排烟性能的影响规律,可以得出太阳能烟囱建筑的控制火灾能力。本文基于缩比例实验装置,研究辐射功率和火源功率对太阳能烟囱建筑自然通风及自然排烟效果的影响,分析讨论室内通风口风速、窗户风速、太阳能烟囱温度分布、室内竖直温度分布及烟气运动规律,衡量太阳能烟囱建筑不同维度或者太阳辐射功率下的性能差异及其控制火灾能力。研究结果表明,自然通风和自然排烟效果随辐射功率的增加呈现增大的趋势;不同火源功率下,随着火源功率的增加自然通风风速基本不变,自然排烟风速逐渐增大,然而建筑内部可见度降低、烟气扩散程度增高。
[Abstract]:Solar chimney buildings use solar chimney structure for natural ventilation, its natural ventilation effect is good, natural ventilation system energy conservation and environmental protection, it is expected to reduce building energy consumption, One of the effective measures to make full use of solar energy. If the chimney shaft structure of solar chimney building can be used for natural smoke exhaust, it can avoid the idle resources of mechanical smoke exhaust system and certain start-up failure rate. At present, there is less research on the natural smoke exhaust of solar chimney buildings, and whether solar chimneys can take into account the effects of natural smoke exhaust and natural ventilation, And how to design its structural parameters reasonably is not clear. The research work of solar chimney building which can be used for both natural ventilation and natural smoke exhaust is divided into two aspects as follows: 1) the structural parameters of natural ventilation and natural smoke exhaust in solar chimney buildings include the height of indoor vents. The space between solar chimney cavities, the thickness of glass curtain wall and so on. The height of indoor air vent and the space between the cavity of solar chimney are important structural parameters affecting natural ventilation and natural smoke exhaust. The effects of indoor ventilation height and space between solar chimney cavities on the natural ventilation and smoke emission of solar chimney buildings are studied. The wind speed of indoor vents, the wind speed of windows and the temperature distribution of solar chimneys are analyzed and discussed. The indoor vertical temperature distribution and smoke movement can be used to guide the structural parameters of the new solar chimney building. The results show that, The effect of natural ventilation and natural smoke exhaust increased first and then decreased with the increase of vent height, and the best indoor ventilation height was located near the eaves on the window. The effect of natural ventilation and natural smoke exhaust increases first and then decreases with the increase of the space between the solar chimney cavities.) the radiation power and the fire source power are the key boundary conditions for the natural ventilation and natural smoke exhaust performance of solar chimney buildings. By studying the influence of different radiation power on the natural ventilation and smoke exhaust performance of solar chimney buildings, It can be concluded that the performance of solar chimney buildings under different latitudes or solar radiation power is different. By studying the influence of different fire source power on the natural ventilation and smoke exhaust performance of solar chimney buildings, In this paper, the influence of radiation power and fire source power on the natural ventilation and smoke exhaust effect of solar chimney building is studied, and the wind speed of indoor vent is analyzed and discussed. The wind speed of windows, the temperature distribution of solar chimneys, the vertical temperature distribution in the room and the laws of smoke movement are measured to measure the difference of performance and fire control ability of solar chimney buildings under different dimensions or solar radiation power. The effect of natural ventilation and natural smoke exhaust increases with the increase of radiation power, and with the increase of fire source power, the natural ventilation wind speed increases gradually with the increase of fire source power. However, the internal visibility of the building is reduced and the degree of smoke diffusion is increased.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU834

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