地下汽车库通风与防排烟设计的探讨

介绍了地下汽车库通风与防排烟设计 ,讨论了地下汽车库排风量、排烟量的计算和地下汽车库通风系统的模式 ,指出了在地下汽车库通风排烟设计上的注意事项     

无风管诱导通风在地下汽车库中的应用

分析了地下汽车库中常规通风系统的弊端，介绍了诱导通风系统的原理和特点，给出了一个新型无风管诱导通风系统应用实例，对于地下汽车库的通风设计具有参考价值。     

地下汽车库通风排烟方式的探讨

根据汽车库设计规范,对地下汽车库通风排烟几种相应的可行方式进行了说明和探讨,分析了这些方式的优缺点以及设计需要注意的问题。     

高层建筑地下汽车库通风和排烟问题的探讨

通过对地下汽车库有害物的发生特点及其通风量计算方法的分析，提出了排风口位置的合理设置和排烟、排风合用系统的设计方法。为高层建筑地下汽车库创造良好排烟、通风系统提供了科学依据。     

地下汽车库通风系统和防排爆设计

分析了传统的地下汽车库通风系统存在的问题，推荐使用送风导流器(诱导风箱)于大面积汽车库通风系统。结合规范要求，探讨了地下汽车库防排烟设计问题。     

地下汽车库通风排烟不同方式的比较

根据已经开始执行的汽车库设计新规范，对地下汽车库通风排烟几种相应的可行方式进行了说明和比较，分析了这些方式的优缺点以及设计中需要注意的问题。     

地下汽车库通风与排烟系统的设计分析

对传统通风方式与诱导通风方式进行了比较,并阐述了诱导通风系统的原理及特性,分析了地下汽车库诱导通风与排烟系统的设计方法,提出了设计中应注意的问题,从而优化地下汽车库通风与排烟系统设计.     

地下汽车库通风系统和防排烟设计

分析了传统的地下汽车库通风系统存在的问题 ,推荐使用送风导流器 (诱导风箱 )于大面积汽车库通风系统。结合规范要求 ,探讨了地下汽车库防排烟设计问题。     

诱导通风系统在地下汽车库的应用探讨

通过对地下汽车库诱导通风系统的设计原理、设计步骤的介绍，并通过与传统的通风系统的优劣进行比较，依据工程实例分析得出诱导通风系统在地下汽车库的适用性、经济性和先进性。     

地下汽车库排风与排烟系统的设计

本文简要介绍了地下汽车库排风量及排烟量的计算方法,以及几种常见的地下汽车库通风及排烟系统形式,得出了地下汽车库的通风与排烟系统基本上可以合一的结论。     

浅谈地下车库的通风与排烟设计

根据实际工程经验以及设计规范,对地下车库的通风和排烟系统进行讨论,提出了地下车库的通风、排烟系统既要满足其自身的使用功能,达到良好的使用效果,又要达到建筑的空间需求,从而保证其通风排烟效果,使建筑空间更合理。     

Exhaust ventilation in attached garages improves residential indoor air quality

Previous research has shown that indoor benzene levels in homes with attached garages are higher than homes without attached garages. Exhaust ventilation in attached garages is one possible intervention to reduce these concentrations. To evaluate the effectiveness of this intervention, a randomized crossover study was conducted in 33 Ottawa homes in winter 2014. VOCs including benzene, toluene, ethylbenzene, and xylenes, nitrogen dioxide, carbon monoxide, and air exchange rates were measured over four 48‐hour periods when a garage exhaust fan was turned on or off. A blower door test conducted in each garage was used to determine the required exhaust fan flow rate to provide a depressurization of 5 Pa in each garage relative to the home. When corrected for ambient concentrations, the fan decreased geometric mean indoor benzene concentrations from 1.04 to 0.40 μg/m³, or by 62% (P<.05). The garage exhaust fan also significantly reduced outdoor‐corrected geometric mean indoor concentrations of other pollutants, including toluene (53%), ethylbenzene (47%), m,p‐xylene (45%), o‐xylene (43%), and carbon monoxide (23%) (P<.05) while having no impact on the home air exchange rate. This study provides evidence that mechanical exhaust ventilation in attached garages can reduce indoor concentrations of pollutants originating from within attached garages.     

地下汽车库通风及防排烟设计中几个常见问题的探讨

对比了涉及地下汽车库通风及防排烟设计的3本规范的相关内容,介绍了应用规范、计算排烟量、选择风机、布置风口等的注意事项及合理做法。     

喷流诱导通风系统在某工程地下车库中的应用

结合工程实例，指出常规地下车库送排风系统的不足，介绍了自动喷流诱导通风系统的原理及在该工程中的应用，对两种通风系统进行了经济性比较。     

诱导通风系统在地下车库的应用

本文针对地下停车库的通风设计,对常规通风系统和诱导通风系统之间进行分析对比,并结合工程实例,阐述地下车库诱导通风与排烟系统的设计方法。     

Automobile proximity and indoor residential concentrations of BTEX and MTBE

Attached garages have been identified as important sources of indoor residential air pollution. However, the literature lacks information on (1) how the proximity of cars to the living area affects indoor concentrations of gasoline-related compounds, such as benzene; and (2) the origin of these pollutants, i.e., vapor or tailpipe emissions. We analyzed data from the Relationships of Indoor, Outdoor, and Personal Air (RIOPA) study to evaluate indoor (C_in) and outdoor (C_out) concentrations for 114 residences with cars either in an attached garage, a detached garage or carport, or without cars. Results indicate that single-family detached homes with cars in attached garages were affected the most by parked vehicles, followed by homes with vehicles in carports. Concentrations in homes with cars in detached garages were similar to those in residences without cars. Low ventilation rates exacerbated C_in in homes with attached garages. In general, the contribution from gasoline-related sources to indoor benzene and MTBE concentrations appeared to have been dominated by car exhaust, or by a combination of tailpipe and gasoline vapor emissions. Residing in a home with an attached garage could lead to benzene exposures that are an order of magnitude higher than exposures from commuting in a car in heavy traffic, with a risk of 17 excess cancers in a population of a million. Strategies to lower exposure to gasoline-related contaminants in homes include improving construction practices to prevent the infiltration of pollutants into the living quarters or incorporating detached garages.     

Vertical profiles of temperature and contaminant concentration in rooms ventilated by displacement with heat loss through room envelopes

The purpose of this study is to examine the effect of heat loss through walls upon the gradients of temperature and contaminant concentration in room with displacement ventilation. It is known that conduction heat loss is governed by outside temperature, heat load inside the room, supply air temperature and overall heat transfer coefficient of walls. Experiments were conducted to measure the temperature gradient and the ventilation efficiency in the room ventilated by displacement ventilation with various combinations of heat load and temperature difference between supply air and outside air. In order to simulate the change of seasons, the supply air temperature was changed instead of the outside air temperature. The effect of supply air temperature and heat generation inside the room on the temperature gradient and the concentration of tracer gas were investigated through the experiments. As a result, it turned out that the higher the heat generation rate and the lower the supply temperature, the stronger the temperature stratification and the lower the concentration in the lower zone. Additionally, ventilation heat loss turned out to be a good index for assessing the concentration in the lower zone. Temperature differences of around 3 degrees C between supply air temperature and exhaust temperature are at least needed for displacement ventilation under the conditions of the experiment presented in this paper.     

地下车库通风的变频控制研究

针对目前地下车库变风量系统中常用的间歇控制法和双速风机法存在的控制过于简单、不能很好地改善地下车库内的空气品质、不能最大限度地节能的问题,提出了根据车库内CO浓度的实时变化情况,采用风机变频控制地下车库通风量的方法。介绍了某地下车库通风系统的风机变频控制改造工程。结果表明,风机变频控制改造在技术上是可行的,能节约电能,且投资回收期较短。     

地下车库连通道非平直上坡段防排烟设计

某地下车库主通道为单向2车道,采用横向通风系统,换气次数按10次/h设计,补风量为排烟量的85%。排烟口尺寸0.8m×0.5m,距离地面3.5m,每25m设置一个。设置5MW的火灾,分两种排烟方案,使用CFX与FDS对烟气流动模拟计算。起火272s后主通道内人员疏散完毕,比较此时两种排烟方案下各防烟分区的温度分布、CO2浓度、风速矢量可知,方案二排烟效果优于方案一。在较大火灾情况下两种排烟方案控烟效果均不理想,建议限制通道内火灾荷载。     

关于全面通风上下部排风量分配问题

认为过去关于全面通风排风量在作业场所上下部的分配，相关设计规范和技术规定是根据有害物的气体密度来确定的，而忽略了有害物气体的允许浓度值。鉴于混合后的气体密度为有效相对密度，而不是有害物气体密度，它与空气密度相差甚微。因此，在室内上下部分别以不同比例排风拟科没有必要。