济南奥林匹克体育中心自然通风设计

采用CFD技术对整个体育中心进行了微气候模拟分析,分析了各场馆自然通风的策略,并进行了自然通风的系统设计.     

数值模拟技术在建筑自然通风设计与优化中的应用

以某绿色建筑项目的自然通风设计为例,利用CFD数值模拟技术对设计建筑的室外流场和室内主要功能空间的自然通风效果进行模拟分析,为建筑自然通风的开口设计与优化提供参考依据。在绿色建筑的设计中,自然通风的设计是不可忽略的一方面,而CFD数值模拟技术是绿色建筑设计的有效技术手段。     

不同气候区铁路客站自然通风使用策略研究

确定了铁路客站自然通风的热舒适标准;结合实地调研,分别采用DeST和CFD软件模拟研究了自然通风在不同气候区铁路客站中的应用;分析了利用自然通风提高铁路客站的热舒适性并降低空调系统能耗的可能性;重点给出了不同气候区铁路客站利用自然通风时应采取的策略,为今后铁路客站的自然通风设计提供参考和依据。     

中庭作为高层建筑自然通风手段的模拟分析

本文通过论述分析国内外高层建筑案例,对利用自然通风调节高层建筑室内空气环境所存在的问题进行讨论,阐述了高层建筑利用中庭进行自然通风的优势,并针对当前对该领域研究较为匮乏的现状,提出采用 CFD 模拟的方法,分析该方式在高层建筑自然通风相关方面的改善作用,并为今后相关方面的设计提供更加客观的依据。     

大理白族传统民居自然通风及其优化研究

本文选取大理白族传统民居中的"三坊一照壁"作为白族典型传统民居,利用CFD模拟技术对在自然通风状态下的典型传统民居进行室内外自然通风模拟分析,并探讨其自然通风的优化设计策略,提高白族传统民居室内热舒适度,为将来白族传统民居的建设发展提供可行性设计参考.     

新型传统民居风环境研究——以云南彝族民居为例

为了探求具有良好自然通风的传统民居形式,本文对云南彝族传统民居的室内、外空气温度和风速进行了实测;并利用CFD软件对其室内和院落的风环境进行了模拟,分析各建筑因素(院门的开启、院墙的高低、畜棚的位置及门窗的设置)对自然通风的影响。结果表明,合理设置窗户和百叶、增加通风槽、扩大正房厦子能有效提高室内的自然通风效果;合理调整附属建筑的位置、院落尺寸和院墙高低能改善院落的自然通风效果。在此基础上,提出了改进风环境的设计建议。     

自然通风热分布系数规律性初探

针对以室内热源为主的一类自然通风,采用CFD软件进行了模拟,并将结果与公式值进行了比较,揭示了自然通风热分布系数的一般性规律。采用CFD软件模拟有一定的误差,但对于工程计算和研究是可行的。     

基于CFD的夏季高校宿舍楼室内自然通风设计策略研究——以济南某高校宿舍楼为例

室内自然通风设计是防止呼吸道疾病传播、改善室内空气品质、提高室内舒适度的重要手段。为解决高校宿舍楼夏季室内自然通风不良、空气温度高、空气品质低的问题,以夏季济南某高校宿舍楼为研究对象,以CFD(计算流体力学)技术为基础,采用PHOENICS软件数值模拟方法对宿舍室内风速与空气龄分布进行模拟,分析得出室内自然通风效果较差。从建筑平面与剖面通风的优化设计、通风构件改造、室内相对湿度调节三方面提出了优化阳台正负压区、优化内走廊南北对流、加设垂直拔风井、改善窗户开启方式与加设窗户导风板等设计策略。探讨了宿舍室内自然通风设计方法,为学生创造良好的生活与学习环境,为改善高校宿舍楼室内风环境提供一定的理论依据与技术支撑。     

通风口对工业热厂房自然通风的影响分析

将厂房内工作区热环境的实测值与模拟值作对比分析,验证了夏季自然通风条件下计算流体力学CFD数值模拟结果的可靠性。在此基础上,分析了进排风口中心高度差的改变对厂房内工作区热环境的影响。结果表明:随着进排风口中心高度差的增大,工作区温度总体呈递减趋势,研究成果为工业热厂房自然通风系统的设计提供了相应的参考。     

被动节能在某室内恒温游泳池中的应用

在该恒温游泳池设计中引入了自然通风系统,结合CFD模拟结果确定了进排风方案。给出了自然通风、自然通风与机械通风联合运行和空调运行的逻辑判定条件。采用广州市典型气象年的气象资料计算了全年通风运行时间,并通过全年能耗模拟分析了其节能效益。     

Predicting thermal and energy performance of mixed-mode ventilation using an integrated simulation approach

Mixed-mode ventilation can effectively reduce energy consumption in buildings, as well as improve thermal comfort and productivity of occupants. This study predicts thermal and energy performance of mixed-mode ventilation by integrating computational fluid dynamics (CFD) with energy simulation. In the simulation of change-over mixed-mode ventilation, it is critical to determine whether outdoor conditions are suitable for natural ventilation at each time step. This study uses CFD simulations to search for the outdoor temperature thresholds when natural ventilation alone is adequate for thermal comfort. The temperature thresholds for wind-driven natural ventilation are identified by a heat balance model, in which air change rate (ACH) is explicitly computed by CFD considering the influence of the surrounding buildings. In buoyancy-driven natural ventilation, the outdoor temperature thresholds are obtained directly from CFD-based parametric analysis. The integrated approach takes advantage of both the CFD algorithm and energy simulation while maintaining low levels of complexity, enabling building designers to utilize this method for early-stage decisionmaking. This paper first describes the workflow of the proposed integrated approach, followed by two case studies, which are presented using a three-floor office building in an urban context. The results are compared with those using an energy simulation program with built-in multizone modules for natural ventilation. Additionally, adaptive thermal comfort models are applied in these case studies, which shows the possibility of further reducing the electricity used for cooling.     

北方地区过渡季节草菇房自然通风模型研究

通过对西北地区某草菇种植房进行现场实测,得出草菇在在子实体生长阶段CO2散发量;在此基础上针对北方地区过渡季节草菇种植的自然通风方案,通过CFD模拟及计算得出在此种通风方式下的通风参数及时间间隔.     

Coupled simulations for naturally ventilated rooms between building simulation (BS) and computational fluid dynamics (CFD) for better prediction of indoor thermal environment

The coupling strategies for natural ventilation between building simulation (BS) and computational fluid dynamics (CFD) are discussed and coupling methodology for natural ventilation is highlighted. Two single-zone cases have been used to validate coupled simulations with full CFD simulations. The main discrepancy factors have also been analyzed. The comparison results suggest that for coupled simulations taking pressure from BS as inlet boundary conditions can provide more accurate results for indoor CFD simulation than taking velocity from BS as boundary conditions. The validation results indicate that coupled simulations can improve indoor thermal environment prediction for natural ventilation taking wind as the major force. With the aids of developed coupling program, coupled simulations between BS and CFD can effectively improve the speed and accuracy in predicting indoor thermal environment for natural ventilation studies.     

Ventilation performance prediction for buildings: A method overview and recent applications

This paper presented an overview of the tools used to predict ventilation performance in buildings. The tools reviewed were analytical models, empirical models, small-scale experimental models, full-scale experimental models, multizone network models, zonal models, and Computational Fluid Dynamics (CFD) models. This review found that the analytical and empirical models had made minimal contributions to the research literature in the past year. The small- and full-scale experimental models were mainly used to generate data to validate numerical models. The multizone models were improving, and they were the main tool for predicting ventilation performance in an entire building. The zonal models had limited applications and could be replaced by the coarse-grid fluid dynamics models. The CFD models were most popular and contributed to 70 percent of the literature found in this review. Considerable efforts were still made to seek more reliable and accurate models. It has been a trend to improve their performance by coupling CFD with other building simulation models. The applications of CFD models were mainly for studying indoor air quality, natural ventilation, and stratified ventilation as they were difficult to be predicted by other models.     

昆明南站自然通风优化研究

本文将通风模型与热力模型相结合,运用CFD软件Airpak和多区域网络法模拟工具ContamW对昆明南站高架候车层进行了自然通风优化设计,分析了不同工况下的自然通风效果,获得了较优的自然通风方案。同时利用能耗模拟软件DeST对昆明南站自然通风节能潜力进行了分析。研究成果可为铁路客站自然通风的优化设计提供指导。     

采用"二区+CFD"模型研究点源自然通风及其羽流

讨论了几个典型的羽流流量计算公式,结合一种二区自然通风模型,建立了热分层高度、通风量和中和界高度的计算式。基于单步静态耦合(或预定边界条件)的思想,采用“二区 CFD”模型的方法研究了自然通风及其羽流。二区模型提供CFD模拟边界条件,CFD模拟反向检验二区模型,同时检验各羽流公式的适用性。     

电厂通风方式选择的可行性分析

电厂厂房选择合理的通风方式至关重要,在机械通风的基础上适当的引入自然风,能够起到节能、降低投资成本的作用。通过CFD模拟验证了自然进风、自然排风以及自然排风与机械排风相结合的方式的合理性,同时数值模拟手段也可为通风设计优化提供有力指导。     

海南省龙楼镇自然通风技术应用现状分析

自然通风技术在节能、改善室内热舒适性和提高室内空气品质等方面具有天然的优势,海南省的新城镇建设仍然缺乏对自然通风的合理利用,对能源的消耗造成了很大的浪费。通过对龙楼镇的主要街区进行自然通风技术现场调研及CFD模拟研究,发现其存在的问题并探寻科学合理的解决办法。