共查询到18条相似文献,搜索用时 156 毫秒
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自然通风是实施绿色建筑中常用的一项技术措施。随着节能减排的大力倡导,自然通风技术引起了人们的普遍关注。目前,人们已通过不同的措施与手段来最大程度地利用自然通风以满足舒适度要求,其中太阳能烟囱作为一种利用热压来强化自然通风的有效技术也被广泛采用。太阳能烟囱的通风效果除与烟囱尺寸及当地太阳辐射强度密切相关外,也与其自然通风建筑特性有关。采用FLUENT软件对太阳能烟囱结合不同建筑开口形式及不同开口尺寸的自然通风模型进行了三维稳态数值模拟。研究了在不同方案下,不同开口形式对通风量的影响,分析了通风量随进风口尺寸的变化情况。模拟结果表明,在相同热流密度情况下,单开口建筑下的太阳能烟囱诱导的通风量大于双开口建筑,且当进出风口面积比A1/A2=2.5~4时,竖直集热板屋顶式太阳能烟囱能诱导更多的空气。 相似文献
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为改善体育馆自然通风效果,利用CFD模拟方法从进风量、进深方向气流深入程度以及主要功能空间风速3个方面分析不同通风口形状对体育馆风压通风特性的影响。在验证湍流模型及网格独立性分析后,比较3种通风口形状工况在相同边界条件下的流量、流场及流速。结果表明:通风口形状对体育馆室内风环境影响显著。在3种工况中,正方形通风口表现较差,与之相比采用竖向长条形通风口可使通风量增加6.82%,同时使进入室内的气流向下流入主要功能空间,气流运动更加深入,看台区和场地区气流速度明显提升,其中场地区平均风速增加75%,对提高体育馆自然通风效率十分有利。 相似文献
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利用计算流体力学的分析方法,用平均空气龄和空气龄标准差对自然通风量的大小及其通风均匀性进行研究。对采用推拉窗、上悬窗、平开窗的板式居住建筑在N、NNW、WN风向下的自然通风状况进行对比分析。研究发现,对于自然通风的均匀性,平开窗开启方式优于推拉窗、上悬窗开启方式。对于建筑自然通风量,当风向为N及NNW风向时,推拉窗开启方式优于上悬窗、平开窗开启方式。当风向为WN风向时,平开窗开启方式优于推拉窗、上悬窗的开启方式。当同时考虑建筑自然通风量与自然通风均匀性时,平开窗开启方式具有明显的优势。 相似文献
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杨天文 《四川建筑科学研究》2012,38(4):312-316
通过fluent模拟软件对诸多因素中最为关键的风向、风速、开窗位置及面积等进行了优化模拟研究。结果表明:在西安地区,南向为最佳风向,室外风速在1.3~2.5 m/s之间,基本上都能满足自然通风要求,最佳风速为1.5 m/s;综合考虑采光和自然通风因素,窗户开在墙的中间为宜;北向面积适当减小有利于自然通风在室内形成较均匀的气流,在保证建筑节能标准的前提下,增大南向窗户面积有利于自然通风。 相似文献
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基于自然通风原理的通风窗智能控制系统构造 总被引:2,自引:1,他引:1
针对建筑自然通风原理及特点,分析了电动开窗器的原理,讨论了风压和热压作用下的电动开窗控制系统流程,以及通风窗和电动开窗器的选型,并提出一种基于自然通风原理的楼宇智能通风窗控制系统,给出了构成要素,同时对系统底层、中间层、上层的特点加以讨论。 相似文献
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Natural ventilation potential model considering solution multiplicity, window opening percentage, air velocity and humidity in China 总被引:1,自引:0,他引:1
The paper brings about a two-opening naturally ventilated building potential model considering solution multiplicity, window opening percentage, air velocity and humidity in China. Based on previous research by Yang et al. and Luo et al., this paper developed a revised model to estimate the natural ventilation potential. There are four main improvements: Firstly, counteract of wind and thermal pressure was included and method for multiple solutions was introduced accordingly. Secondly, the model considered the natural ventilation hours for windows opening percentage. Thirdly, wind velocity and humidity were considered lastly. Fourthly, cooling and heating hours were also estimated.In case study, the paper analyzes natural ventilation potential in cities in four typical climate regions in China. Results show that there are more natural ventilation hours than previous models estimated, especially in cold climate regions.Any parameter in this model can be changed according to practical situation, such as climate data, building orientation, window size, opening position, etc. All estimated information can provide reference for architects in early stages of building design. Meanwhile, this model can be used for energy efficiency estimation and indoor environment research. 相似文献
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In the present paper, the distribution characteristics of the wind pressure coefficient of the air flow around enclosed and open-window buildings were studied by using wind tunnel model tests and numerical analyses. A typical high-rise building model was designed and wind tunnel tests were performed for the airflow around the building for an enclosed and an open-window condition. The experimental findings were complemented by the numerical analysis. This study shows that the opening windows of a building has little influence on the wind pressure coefficients in the area around the window of adjacent area from window edge; the wind pressure coefficient increases slightly after opening the windows of the buildings. Opening the windows in the rooms adjacent to this window decreases the ventilation efficiency of the room although the influence is small. The time-average value of the wind pressure coefficient can effectively represent the magnitude of the instantaneous wind pressure coefficient. The wind pressure coefficient is independent of the wind velocity of inflow. Furthermore, this study also proposed the distribution characteristics of wind pressure coefficients with different incident angles of wind. 相似文献
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《Building and Environment》2004,39(10):1157-1170
Concern about global warming has resulted in a resurgence of interest in naturally ventilated offices. Windows opening can, most of the time, be enough to cool the buildings. To compare various strategies, simulations with the software TAS were made to analyse zone air flows, temperature evolution and needs for cooling in an office. Simulations show that sufficient day or night ventilation rate can be reached by window opening, even if wind characteristics are unfavourable. We studied which should be the size, shape and location of the window apertures to reach sufficient ventilation rates. We finally analysed the impact of the wind orientation and the degree of wind protection of the building on these ventilation rates. 相似文献