会议室夏季空调送风方式的模拟分析

利用CFD软件分别对旋流风口送风方式和喷口送风方式下的会议室内的送风效果进行数值模拟,分析两种送风方式下的温度场和速度场,同时对气流分布性能和热舒适性评价指标进行比较,确定合适的送风方式。结果表明,旋流风口送风方式下的温度场和速度场更加均匀,热舒适性优于喷口送风方式。     

新风系统对室内CO2质量分数分布影响的模拟

采用数值模拟方法,选取室内两个具有代表性的截面,研究送风温度、送风相对湿度、送风方式对卧室二氧化碳质量分数分布的影响。排风口位于床头一侧接近地面的位置,两种送风方式为上送风方式(送风口位于门上方)、床头送风方式(送风口位于床头上方)。送风相对湿度一定时,送风温度越低,两截面的二氧化碳质量分数越低。送风温度一定时,送风相对湿度越低,两截面的二氧化碳质量分数越低。较低的送风温度、送风相对湿度有利于二氧化碳的排出。与上送风方式相比,床头送风方式有利于二氧化碳在室内的扩散,不仅保证呼吸区域的空气质量,还保证室内其他区域的空气质量。     

空调房间不同送风方式的实验研究

本文通过对空调房间三种不同送风方式（下送风、上送风和侧送风）进行实验研究,从主、客观两方面进行评价,实验结果表明：在保证相同的室内环境参数下,下送风通风空调系统优于上送风和侧送风两种传统送风方式,能够获得较好的舒适度和空气品质。     

工作区有隔断的大空间建筑CFD模拟

本文通过数值模拟的方法对不同送风方式下工作区内有、无隔断物时,工作区内的空气分布特性及舒适性进行研究。对室内舒适性的评价基于整合于CFD软件内部的Fanger舒适性方程。对气流分布特性的评价采用了ADPI指标。模拟结果显示,隔断物对喷口送风方式的影响大于对旋流风口送风方式的影响;旋流风口送风方式优于喷口送风方式;改变喷口送风高度并不能明显改善隔断物带来的影响。两种送风方式工作区内的PMV指标都符合GB／T18049-2000的要求。本文的结论可以作为以后同类工程的借鉴和指导。     

纤维织物风管在冷库中应用的研究

文章针对我国冷库现阶段存在的问题对冷库不同送风方式进行了研究,分析了冷库传统送风方式的不足,提出了一种新型送风方式,即纤维织物风管送风,阐明了其在冷库中应用的优势,并介绍了其在冷库中应用的设计方法.     

数据中心三种送风方式的对比研究

本文利用CFD模拟软件6SigmaRoom对数据中心机房中常见送风方式(上送风、下送风、列间送风)进行模拟研究,通过分析性能指标、能源利用效率等来比较这3种送风方式的制冷效果及气流组织的合理性。最后通过改变机房设备负荷,来探讨3种送风方式在不同设备发热量下对机房热环境及能源使用效率的影响。研究结果显示,在机房负荷、机柜布置方式、空调系统制冷量等参数一定的情况下,列间送风可获得较高的能量利用率和较好的气流组织形式。本文研究结果可为数据中心的绿色化建设提供参考。     

空调系统送风方式对热舒适性的影响

本文介绍了地板送风、工位送风和置换通风的基本原理,分析了影响3种送风方式热舒适性的主要因素,如温度梯度、气流速度及送风口形式等。对3种送风方式的使用条件、热舒适性及系统运行能耗进行了比较。     

孔板送风对壁挂式空调房间热舒适性的影响

为研究孔板送风方式对壁挂式空调房间热舒适性的影响,采用Airpak软件分别对在相同送风量和送风温度下采用传统射流送风和孔板送风的气流组织进行数值模拟,通过对温度场、速度场、PMV-PPD值的对比分析,评价两种送风方式下的室内热舒适性,并采用实验测试的方法,对模拟结果的准确性进行实验验证。结果表明:送风方式对室内热舒适性影响明显,孔板送风对室内气流组织的改进和热舒适性的提高有较显著效果,夏季工况采用孔板送风可以起到节省能耗的作用。     

不同的通风方式对打印室空气环境影响的模拟研究

以打印室为例,通过模拟置换通风、顶棚送风以及传统的中央空调送风形式,得到不同送风方式下的温度场、速度场和污染物浓度场,分析结果表明,置换通风方式并不适宜用在此类房间中(污染物密度比空气大的房间);在相同的能量消耗情况下,传统的中央空调送风形式不能提供良好的热环境,顶棚送风可以获得相对较好的室内空气环境。     

不同送风方式下室内热舒适性的比较

随着人们对室内空气品质和节能的要求日益提高,置换通风、地板送风和碰撞射流通风等送风方式也逐步得到推广应用。本文利用实验方法实测了传统的混合通风与这三种送风方式下空调房间的室内温度和气流速度,对不同送风方式下室内温度分布、气流分布和热舒适性进行分析比较。     

民用建筑室内新风量检测方法影响因素的研究

新风对于稀释室内空气中的有害物质、改善室内环境有着重要的意义。新风量则是衡量新风的有效手段,目前不设独立新风系统的建筑室内新风量测量广泛采用CO_2示踪气体法。本文通过一系列实验探讨CO_2初始浓度、门窗开关方式、室外风速以及室内杂物对室内新风量检测结果的影响。实验结果表明CO_2初始浓度、门窗开关方式、室外风速、室内杂物这些因素均对新风量检测值均存在不同程度的影响,其中室外风速和室内有无杂物对新风量检测结果的影响最为明显。     

剧场座椅送风气流组织数值模拟

座椅送风是置换通风的一种具体形式,不同于传统置换通风的侧送风形式,我国在这方面设计规范也相应较少,又鉴于座椅送风初投资昂贵,在设计时有必要对其气流组织、舒适性等加以模拟预测。本文采用FLUENT软件对其空调系统的气流组织进行模拟研究,运用座椅送风的简化模型,模拟各种送风形式下的温度场和速度场,对比了各种送风形式的温度、速度、风量等因素,为大空间建筑空调系统优化设计、模拟气流组织提供了方法及理论依据。     

某报告厅空调系统的设计及其能耗分析

介绍了西安某办公楼报告厅空调系统的设计。分别应用置换通风与混合通风两种通风方式，在室外和室内设计参数相同的情况下，充分比较了它们在送风量、新风量、能耗以及室内空气品质的不同。结果表明在某些应用场合，置换通风在空气品质提高和能耗降低上有明显的优势，同时这种优势不以牺牲热舒适性为代价，因此建议使用置换通风系统。     

通风的有效性与室内空气品质

指出了通风有效性对改善室内空气品质的重要性,比较了不同送风方式的换气与通风效率,分析了通风效率与室内污染度的关系,最后提出了关于如何提高通风效率的建议。     

A review of ventilation and the quality of ventilation air

Ventilation is pivotal in terms of securing optimum indoor air quality. In addition, it also has a major impact on energy use in buildings. It is important, therefore, that the role and impact of ventilation is fully understood and that ventilation is employed efficiently. The purpose of this paper is to review these aspects with particular reference to recent research and developments. Key aspects are concerned with identifying the role of ventilation and reviewing this role in the context of the other measures that must be taken to secure a healthy indoor environment. References are particularly made to the development of standards and recent related research. Although good progress is being made, areas that still need to be addressed include maintaining good outdoor air quality and preventing contaminated outdoor air from entering buildings. The outcome of recent research must also be disseminated in practical ways to policy makers, building occupiers and practitioners. Good indoor climate can be achieved, not so much by introducing expensive concepts, but by developing a rationale approach to identifying needs and applying the necessary tools to deal with each need.     

桑给巴尔岛机场国际航站楼空调通风设计

介绍了坦桑尼亚桑给巴尔岛国际航站楼EPC项目的空调通风设计,分别从负荷,冷源,输配系统,末端设备的设计以及气流组织等方面进行了探讨。     

Ventilation rates and health: multidisciplinary review of the scientific literature

The scientific literature through 2005 on the effects of ventilation rates on health in indoor environments has been reviewed by a multidisciplinary group. The group judged 27 papers published in peer-reviewed scientific journals as providing sufficient information on both ventilation rates and health effects to inform the relationship. Consistency was found across multiple investigations and different epidemiologic designs for different populations. Multiple health endpoints show similar relationships with ventilation rate. There is biological plausibility for an association of health outcomes with ventilation rates, although the literature does not provide clear evidence on particular agent(s) for the effects. Higher ventilation rates in offices, up to about 25 l/s per person, are associated with reduced prevalence of sick building syndrome (SBS) symptoms. The limited available data suggest that inflammation, respiratory infections, asthma symptoms and short-term sick leave increase with lower ventilation rates. Home ventilation rates above 0.5 air changes per hour (h(-1)) have been associated with a reduced risk of allergic manifestations among children in a Nordic climate. The need remains for more studies of the relationship between ventilation rates and health, especially in diverse climates, in locations with polluted outdoor air and in buildings other than offices. PRACTICAL IMPLICATIONS: Ventilation with outdoor air plays an important role influencing human exposures to indoor pollutants. This review and assessment indicates that increasing ventilation rates above currently adopted standards and guidelines should result in reduced prevalence of negative health outcomes. Building operators and designers should avoid low ventilation rates unless alternative effective measures, such as source control or air cleaning, are employed to limit indoor pollutant levels.     

Methods to reduce the CO2 concentration of educational buildings utilizing internal ventilation by transferred air

The aim of this study is to develop internal ventilation by transferred air to achieve a good indoor climate with low energy consumption in educational buildings with constant air volume (CAV) ventilation. Both measurements of CO₂ concentration and a multi‐room calculation model are presented. The study analyzes how to use more efficiently the available spaces and the capacity of CAV ventilation systems in existing buildings and the impact this has on the indoor air quality and the energy consumption of the ventilation. The temperature differences can be used to create natural ventilation airflows between neighboring spaces. The behavior of temperature‐driven airflows between rooms was studied and included in the calculation model. The effect of openings between neighboring spaces, such as doors or large apertures in the walls, on the CO₂ concentration was studied in different classrooms. The air temperatures and CO₂ concentrations were measured using a wireless, internet‐based measurement system. The multi‐room calculation model predicted the CO₂ concentration in the rooms, which was then compared with the measured ones. Using transferred air between occupied and unoccupied spaces can noticeably reduce the total mechanical ventilation rates needed to keep a low CO₂ concentration.     

新史家小学暖通空调设计

该工程建筑配置复杂,分4个区;采用全空气一次回风系统和风机盘管加新风系统。介绍了空调系统划分、空调气流组织形式、通风及防排烟设计及供暖系统设计。     

碰撞射流通风的特性及节能分析

碰撞射流通风方式在20世纪90年代末起源于瑞典,对于我国仍是一种新型的通风方式。本文对碰撞射流通风的特性进行了分析,并将其与混合通风对比突出了它的节能,说明碰撞射流通风是一种相当具有发展前景的通风方式,为碰撞射流通风在我国的应用和推广提供理论基础。