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在对民用建筑通风系统常用过滤器滤料性能测试基础上,建立了常规风机盘管加新风系统空调房间室内颗粒物浓度集总参数模型,讨论了回风过滤段和新风过滤段过滤器效率的设计选型方法。以西安市某空调系统为例,为满足室内PM2.5污染控制标准,基于室外PM2.5浓度"不保证10d"取值计算,结果表明,余压为50~80Pa的机组回风过滤器效率选用G3、G4型过滤器,余压为30~50Pa的机组回风过滤器效率选用初效G2、G3型过滤器,同时,室内设置等效过滤效率的空气净化器,新风选用初效G4加中效F7或F8两级过滤。 相似文献
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介绍了制药企业组合式空调机组中常用新风初效过滤器的选用和维护保养。结合其实际使用情况,通过改变新风口位置、外加防雨罩、增加专用新风处理装置等方案,提高了机组性能,节约了能源,延长了新风过滤器的使用寿命;对空调机组的设计和安装使用有着一定的指导作用。 相似文献
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《建筑热能通风空调》2018,(11)
室外PM2.5设计浓度是空气过滤器设计选型的重要依据。本文结合过滤器选型设计方法,计算出不保证天数为0~50天下新风过滤器的过滤效率,并通过逐时PM2.5浓度对过滤器等级进行评价,得到合理过滤器等级下不保证天数的范围,最后对比分析了各种不保证天数法计算方法的差异性。研究结果表明,我国大部分城市过滤器等级应选择F9~H11,室外PM2.5设计浓度确定方法宜采用历年不保证天数为3~5天的日平均值。 相似文献
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本文通过对位于我国不同地区的八个城市7年间室外PM2.5日均数据进行整理,用年不保证5天均值法得出各城市室外PM2.5在空调季节和过渡季节的设计值.以办公建筑一次回风空调系统中过滤器效率为研究对象,分析计算了在空调季最小新风工况和过渡季增大新风比工况下空调系统过滤器所需达到的效率值,从而给出不同城市过滤器配置选型建议. 相似文献
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通过对颗粒物各粒径段浓度数据处理以及耦合通风空调系统,得到了新风对颗粒物计数浓度的贡献率和客室内贡献率公式.进而分析了动车组车厢内的颗粒物粒径分布特征以及新风、客室内对颗粒物计数浓度的贡献情况.结果表明客室内颗粒物主要由PM1.0组成;颗粒物粒径越小,新风贡献率越大,随着颗粒物粒径的加大,新风贡献率逐渐减小,客室内贡献率逐渐增大.该研究结果对解决动车组车厢中可吸入颗粒物浓度控制问题、提高车厢环境空气质量具有指导作用和现实意义. 相似文献
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本文针对一类新风空调机组设计研制了新风空调机组控制模块,该模块配置温湿度传感器、CO2浓度传感器和固体颗粒物浓度传感器,设计了室内空气品质检测模块、新风空调机组启停控制模块、RS485通讯模块等。 相似文献
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变风量空调系统的新风问题 总被引:3,自引:2,他引:1
以某写字楼为例,分析了变风量系统中不同分区形式对各朝向房间的人均新风量分配的影响,认为新风量分配不均的情况主要出现在冬季和过渡季,提出满足所有朝向房间人员健康要求同时能实现过渡季利用新风节能的新风量设计标准;建议在建筑设计中增加新风竖井面积,在空调外区适当增加最小新风量的取值。 相似文献
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Long Xu Fanghua Zhu Fusheng Zha Qiong Wang Bo Kang Chengbin Yang Wei Zhang Zhenghong Liu 《Soils and Foundations》2021,61(2):444-452
Determination of air pressure and assessment of air losses in clayey soil are of great importance to implementation of compressed air tunneling. In the present work, a series of air flow tests were performed to provide a more reasonable method based on flow characteristics of snap-off pressure and the dissolution/diffusion. Results showed that, the nonlinear air flow behavior and gas breakthrough were presented with the increase in air pressure. After that, the excessive pressure decreased continuously to reach an equilibrium termed as the snap-off. For the tested clayey soil, snap-off pressures around 250 kPa could be adopted as the air pressure, which was significantly lower than the gas breakthrough pressures. Diffusion coefficient of 1.5 × 10-11 m2/s could be determined in the followed dissolution/diffusion stage, which bring 3 orders of decreasing magnitude in air losses compared to the capillary flow occurred after gas breakthrough. As a conclusion, the adoption of snap-off pressure in compressed air tunneling could effectively prevent the continuous air/water flow in clayey soil and create a more human-friendly environment. Additionally, less air losses could be presented compared to that using gas breakthrough pressure, indicating tremendous energy savings in field implementation. 相似文献
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Influence of air supply parameters on indoor air diffusion 总被引:6,自引:0,他引:6
This paper presents the field distributions of air velocity, temperature, contaminant concentration, and thermal comfort in an office with displacement ventilation for different air supply parameters such as the effective area, shape, and dimension of the diffuser and the turbulence intensity, flow rate, and temperature of the air supplied. The research is conducted numerically by using an airflow computer program based on a low-Reynolds-number k-ε model of turbulence. It can be concluded that the effective area, shape, and dimension of the diffuser and the turbulence intensity of the air supplied have little effect on the room air diffusion except at floor level. The influence of the flow rate and temperature of the air supplied is very significant on the air diffusion as well as on the thermal comfort and indoor air quality. 相似文献
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