寒冷地区冬季自然通风时段选择优化分析

为获得最优的冬季自然通风时段,以兰州地区某地板供暖民用住宅为研究对象,考虑围护结构对室外温度波的衰减和延迟效应,得到建筑围护结构的等热流边界条件。在此基础上,采用FLUENT软件对不同通风时段的室内污染物浓度场进行了数值分析,结果表明:同一开窗方式时,不同时段的通风时长不同,不同进风温度对室内污染物的时空分布及迁移特性影响显著,综合考虑污染物排除效果及舒适性,发现17:00时开始通风为最优通风时段。     

热力控制型通风房间通风效率的表达式

分析了影响热力控制型通风建筑温度分布的因素.根据相似原理综合各因素得到了两种形式的综合量：无量纲的相似准则和热分层高度等量纲不为一的综合量.用平均量纲一过余温度和通风效率（待定综合量）与其他已定综合量确定了室温垂直分布特征的表达式.对有关文献中的实验和模拟计算数据进行了回归分析,获得了通风效率特征方程式的一种具体形式.     

置换通风的通风效率及其微热环境评价

讨论了通风有效性与空气分布特性的相关性，分析了混合通风（上送下回）通风效率低于置换通风效率的原因。根据大量的实验资料，分析提出了影响通风效率的若干复合因素，得出了预测置换通风效率的经验式。经综合人体舒适性实验，说明置换通风微热环境能提供居住者整体舒适感，而在肢体下部风感不满意率小于１５％     

廊道式教学建筑自然通风效果对比与优化

本文以西安地区某实际设计阶段中的教学建筑为研究对象,通过模拟热压、 风压共同作用下自然通风环境,提取空气龄、 通风效率、PMV等典型参数作为通风性能评价指标,对三种建筑结构形式(内廊式、 外廊式、 双廊式)的自然通风效果进行对比.研究结果分析表明:建筑结构形式、 通风面积因子等因素对建筑自然通风效果有显著影响.在满足室...     

通风系统性能的评价

通过对通风过程的研究，得到了一个用于评价通风系统性能的通风效率和空气龄的方法。与以往方法相比，该法简单，易于操作，既可以用于同一空间不同空调系统的比较，也可用于不同空间不同空调系统的比较，还可以比较不同通风量时通风系统的优劣。     

影响通风房间浓度因素的分析

根据房间通风效率，计算了常见的混合式通风系统的污染物稳定浓度，定量分析了影响稳定浓度的因素，如通风效率、预处理设备的效率、回风率等。认为就给定系统而言，提高通风效率特别是相对效率、提高送风量、设置空气预处理设备是降低室内污染物浓度、降低新风量的有效措施。     

某工程通风系统整体效率实验研究

针对目前国内通风系统运行整体效率普遍低下的状况,本文对某工程通风系统实际运行中整体效率进行了实验研究,介绍了该工程通风系统设计特点和实验测试状况,并对实验结果进行分析,实验结果显示,当系统所需风量减少时,通过降低转速来调小通风系统风量,节能效果非常显著,提出了用整体效率作为通风系统的重要评价指标,并指出提高通风系统整体效率的研究方向。     

VLCC修船通风气流组织的研究

从理论上分析了气流组织对通风效果的影响，根据大型原油运输船（ＶＬＣＣ）修船通风的特点，提出了一种新式的气流组织模型及其相应的末端装置，并通过利用示踪气体法测定通风效率，对气流组织作出了定量评价。     

排除人员活动区内人体释放污染物的有效通风方式--置换通风

分析了置换通风和混合通风的原理。基于气流分布特性和双层模型理论，比较了这两种通风方式的排污能力。对办公室、会议室及体育馆置换通风系统的通风效率进行了实测。结合人体释放污染物的气流运动特性，指出以排除人员活动区内人体释放污染物为目的时，置换通风较混合通风更为有效。     

银行发行库房(金库)通风除湿设计简介

简介银行发行库房（下称金库）通风除湿系统设计的特点、功能。如何配合土建工程设置金库通风除湿系统,在通风除湿设计的各个环节中,同时解决好防火、防盗问题。     

Greenhouse microclimate and dehumidification effectiveness under different ventilator configurations

In this paper, the efficiency of two different greenhouse ventilation opening configurations on greenhouse microclimate during dehumidification process with simultaneously heating and ventilation was analysed by means of computational fluid dynamics (CFD) using a commercial program based on the finite volume method. The numerical model was firstly validated against experimental data collected in a tunnel greenhouse identical with the one used in simulations. A good qualitative and quantitative agreement was found between the numerical results and the experimental measurements. The results of the simulations performed for an outside wind direction perpendicular to the greenhouse axis show clearly the influence of ventilation opening configurations on the velocity, temperature and humidity distributions inside the greenhouse. With the first ventilation configuration (roll-up type) maximum air velocity inside the greenhouse was reached in the greenhouse near the ground, with the lowest values observed near the greenhouse roof. As a result, temperature and humidity decreased first near the ground and afterwards in the rest of the greenhouse volume during the dehumidification process. The exactly opposite pattern was observed with the second configuration (pivoting door type). The maximum air velocities were observed near the greenhouse roof where air temperature and humidity were decreased first during the dehumidification process. Energetically the first configuration is proven to be better since the ratio of latent to sensible exchanges during the dehumidification process was higher than the first configuration.     

溶液调湿技术在昆明南站的应用

分析了昆明南站的溶液调湿通风系统,通过通风满足室内温度要求,通过溶液调湿系统满足室内湿度要求,并对溶液调湿通风系统进行数值模拟和运行工况分析。     

金属填料型吸收式除湿器的除湿性能研究

通过理论和实验相结合的方式,对金属填料型吸收式除湿器的除湿性能进行了研究,分析和讨论了空气和溶液的进口状态参数对出口状态参数的影响.依据双膜理论建立了该除湿器的传热传质数学模型,并进行了理论研究.实验测试与模拟计算结果表明,溶液的状态参数对除湿器传热传质的影响较大.实验过程中除湿器运行稳定,具有应用的可行性.     

地下车库通风优化设计方法

提出一种不同车库不同分析的优化设计方法.对地下车库通风最不利时刻进行分析,给出此时刻通风量的计算方法,并在此基础上结合数值模拟方法,确定通风系统.该方法既提高地下车库内的空气品质,又节省造价、节约运行费用,具有节能意义.     

Mean age of air in a naturally ventilated office: Experimental data and simulations

Indoor air quality has an important role as health determinant; it relates to the health and comfort of building occupants.The present paper investigates the wind-forced natural ventilation rates of an office as observed with tracer decay, according to ISO 16000-8:2007 Standard, both with an experimental and numerical procedure; experimental data were used to validate the numerical method. Moreover the only infiltration rate case was analyzed.Natural ventilation was created by opening the window and the door of the office. A simulation model of the room was carried out by using the computational fluid dynamics (CFD) code Fluent. The experimental set up of the procedure was developed by a portable gas chromatograph. In both the numerical and experimental approach the mean age of air linking to ventilation efficiency was calculated. The defined experimental procedure can be applied to different situations, in order to evaluate the efficiency of both natural and forced ventilation existing systems. When the ventilation is due to the opening of the window and the door, the simulation results are in a good agreement with the experimental ones, therefore the model could be applied to different situations, in order to reduce costs and time in the evaluation of indoor air quality.     

办公建筑内地板送风和置换通风模式对室内环境质量影响的数值模拟对比研究

对地板送风和置换通风进行了理论分析和比较,利用数值计算分别对某办公室采用地板送风和置换通风进行了模拟,从PMV、PPD、通风效率等方面对模拟结果进行分析,最终得出结论：地板送风比置换通风具有更大的送风温差,且工作区的温度梯度较小,更具有舒适性和节能性,可以为工程设计和运行管理提供有益的参考。     

Energy efficiency optimization of combined ventilation systems in livestock buildings

Good ventilation system in livestock buildings is necessary for removing excess moisture and heat and for improving building environment in general. Natural ventilation does not require energy consumption and on the other hand, animals would not be affected by electrical power failures. Because natural ventilation depends largely on temperature difference between inside and outside air and wind velocity and direction it is very important in early stages of building design to provide orientation and accurate opening areas. Numerical simulation of natural ventilation and computation of fluid dynamics in livestock buildings can be usefully integrated in whole ventilation system optimization and related energy consumption decrease. Even in mechanical system ventilation, from flow field obtained in numerical simulation it is possible to optimize these systems. CFD analysis is generally restricted to the study of buildings’ environment flows and space study, and the designer must supply boundary conditions in the form of external and internal buildings’ envelope/wall surface conditions. Finally, the needs for further research and engineering development are outlined.