风机盘管在地铁通风空调系统中的应用

简单介绍了地铁通风空调系统以及风机盘管系统的应用,以成都地铁某车站为例,计算分析了空调季全空气系统与空气-水系统各设备的运行能耗,得出使用空气-水系统更节能的结论,为风机盘管系统在地铁建筑中的应用提供参考依据。     

同步换气法在地铁列车通风系统中的应用

运用科特流理论分析了列车与隧道间气流对列车通风系统的影响，针对现有通风系统存在的问题提出了同步换气法；所设计的进排风一体的组合式离心风机运行试验取得成功。说明同步换气法对解决封闭空间运动过程中的通风换气和内部压力环境控制问题的参考意义。     

地铁空调通风系统能耗现状解析

本文以上海地铁空调通风系统为分析对象，分析该系统能耗状况、节能技术应用现状，提出了系统性、全方位节能的概念和思路。     

北京地铁一、环线环境通风系统的改造分析

按照目前地铁空调系统设置原则,北京地铁工程应设置空调系统。由于一、环线在建设初期未预留空调系统设备位置,因此增设集中空调将受到车站建筑结构的限制。通过对一、环线车站及附属房间调查,得出各车站及附属房间的规模虽不一致,但设置形式基本相同,综合各站情况,本改造方案在选择有关参数时,车站规模参照地铁阜成门站,附属     

地铁通风空调系统方案的几点分析

以无锡地铁3号线一期工程为例,从经济性、舒适性等角度,对地铁工程通风空调系统制式、隧道通风系统形式进行对比分析,讨论地铁通风空调系统方案选择的方法。该工程最终采用屏蔽门系统制式、双活塞隧道通风系统形式。     

地铁屏蔽门通风空调系统活塞风道方案研究

以华东某一城市地铁工程为例,对三种活塞风道设置形式进行了数值模拟分析,对比了不同活塞风道方案下的通风效率,结合经济性分析总结了影响活塞风道方案的因素.     

地铁通风空调系统施工阶段调试分析

地铁通风空调系统作为地铁常规机电系统的重要组成部分,也是地铁联调联试、消防验收、试运营前安全评价、初期运营前安全评估等各项专项验收功能测试必检内容.地铁通风空调系统繁杂、接口复杂,施工阶段影响安装调试的因素也较多.地铁通风空调系统施工阶段的调试尤为重要,本文结合地铁站后工程施工特点,对地铁工程通风空调系统的调试步骤及要...     

地铁空调通风设计探讨

1．排烟系统的设置根据国内外资料统计，地下铁道发生火灾时造成的人员伤亡，绝大多数是被烟气熏倒、中毒、窒息所致。因此有效地使烟气按一定方向排除，有利于乘客疏散和迅速撤离现场是地铁火灾救援的重要组成部分。本文探讨地铁空调通风系统设置和运转的合理性、可靠性。1．1排烟系统与回／排风系统分别独立设置（图1）这种方式占建筑空间多、造价高。地铁车站空间紧张，各种管道错综复杂。另外再设一套排烟系统不合理，地铁车站不宜用这种方式。用1台具备排烟性能的风机平时作回／排风用，火灾是作排烟用，管道系统用1套。这种方式设备少…     

地铁车站通风空调系统电气部分节能改造方案分析

通过对地铁车站通风空调电气系统节能改造方案的分析,提出方案改进建议及新线设计的启示。     

地铁通风空调系统节能研究

地铁车站通风空调系统的能耗占地铁车站总能耗的45%以上,因此如何有效降低通风空调系统能耗是车站节能的重点。通过对地铁通风空调系统进行系统地能耗分析,提出在空调系统设计阶段,采用优化系统布置、大温差送风的措施,具有较好的节能效果;运行阶段,通过采用通风空调系统中风机、水泵的变频技术,动态节能可达27%～78%。     

空调通风工况地铁站台初期火灾烟气运动规律

通过在地铁站台进行的火灾实体试验,对车站各种空调通风条件下棉绳阴燃火与聚氨酯明火的烟气速度、温度进行监测与分析,研究地铁中具有格栅镂空吊顶的车站站台在不同空调通风工况下火灾初期烟气运动的规律。多点风速探头和温度记录探头设置在火源正上方以及在距火源水平距离约2 m远的4个位置,分别设置在镂空格栅吊顶的上方和下方。在空调通风工况下,送风对烟气的上升有不同程度的抑制作用,一定程度上延长了火源的燃烧时间。对于阴燃火源,烟气温度的降低导致烟气很难升至吊顶上方。     

医院的暖通空调设计

结合工程实例,介绍了国内某医院建筑的暖通空调设计,特别介绍了净化空调系统的设计,并采用楼宇自控系统对空调设备进行管理,以保证空调系统的安全、可靠、节能运行。     

地下汽车库兼人防地下室通风系统优化设计

介绍了只设置一个通风管道系统兼顾平时、战时4种功能的工程优化设计方案。该方案能减少室内设备和平时、战时转换工作量,降低工程造价。     

浅谈地铁车站公共区通风空调系统设计

以屏蔽门系统的车站为例,从公共区的冷负荷、湿负荷构成以及公共区通风空调系统设计等方面进行了阐述分析,并给出了相应的计算公式,从而使通风空调系统设计更加完善。     

地下车库通风能耗分析

地下车库的能耗主要体现在通风系统上。分析了地下车库通风能耗的构成,介绍了通风量的确定方法。计算分析表明,采用变风量通风方式,根据车库内CO浓度控制通风量可以减少通风能耗。     

Effects of the solid curtains on natural ventilation performance in a subway tunnel

Solid curtains can be installed in subway tunnels for the promotion of air ventilation in ventilation ducts in association with the piston effect caused by a running train. With an aim to analyze the effects of solid curtains on duct ventilation performance in a subway tunnel, the current study adopts the tunnel and subway train geometries which are exactly the same as those in a previous model tunnel experiment, but newly incorporates two ventilation ducts connected vertically to the tunnel ceiling and two solid curtains placed at an upstream position of a duct near the tunnel inlet and at a downstream position of another duct near the tunnel outlet, respectively. A three-dimensional CFD model adopting the dynamic layering method for tracking the motion of a train, which was validated against the reported model tunnel experiment in a previous study, is employed to predict the train-induced unsteady airflows in the subway tunnel and in the ducts. The numerical results reveal that the duct ventilation performance in a subway tunnel strongly depends on the operation of the solid curtains. The suction mass flow of the air through the duct near the tunnel inlet and the exhaust mass flow of the air through the duct near the tunnel outlet are increased considerably in the case with the solid curtains in comparison with those in the case without the solid curtains.     

Prediction of smoke back-layering length under different longitudinal ventilations in the subway tunnel with metro train

Due to the small width and the large train blockage ratio in subway tunnel, the smoke back-layering will be different from that in the wider road tunnel with small vehicle blockage ratio. In the train blockage region of tunnel, the velocity of longitudinal ventilated air-flow interacting with the back-flowed smoke gas is different from that in the upstream tunnel without train blockage. Then the back-flowed smoke gas might be prevented in the train blockage region with higher ventilation velocity, otherwise it would be stopped in the upstream tunnel without train blockage but with lower ventilation velocity. They were taken into consideration separately and an equivalent fire source was introduced by dividing the dimensionless heat release rate of fire source into two parts in the cases where the smoke back-layering length is longer than metro train length. A series of full-scale numerical simulations are carried out with FDS to investigate the smoke back-layering length in subway tunnel with different train lengths and longitudinal ventilation velocities. The simulation results indicate that the influence of metro train length on the smoke back-layering is great and cannot be ignored any more. A global correlation model is proposed based on the dimensionless analysis and simulation results.     

Application potential of solar air-conditioning systems for displacement ventilation

Solar air-conditioning can have higher application potential for buildings through the strategy of high temperature cooling. In recent years, displacement ventilation (DV), which makes use of the indoor rising plumes from the internal heat gains, provides a more effective supply air option than the traditional mixing ventilation (MV) in terms of both thermal comfort and indoor air quality. As it is possible to raise the supply air temperature to 19 °C for DV, it would enhance the competitive edge of the solar air-conditioning against the conventional vapour compression refrigeration. Through dynamic simulation, a solar-desiccant-cooling displacement ventilation system (SDC_DV) was developed for full-fresh-air provision, while a solar-hybrid-desiccant-cooling displacement ventilation system (SHDC_DV) for return air arrangement. The latter was further hybridized with absorption chiller (AB) to become SHDC_AB_DV, or adsorption chiller (AD) to be SHDC_AD_DV, in order to be wholly energized by the solar thermal gain. Benchmarked with the conventional system using MV, the SDC_DV had 43.3% saving in year-round primary energy consumption for a typical office in the subtropical climate; the SHDC_AB_DV had 49.5% saving, and the SHDC_AD_DV had 18.3% saving. Compared with their MV counterparts, the SDC_DV, the SHDC_AB_DV and the SHDC_AD_DV could have 42.4%, 21.9% and 30.3% saving respectively.     

Experimental and numerical analyses of train-induced unsteady tunnel flow in subway

To analyze the unsteady three-dimensional flow in the subway tunnel caused by the passage of a train, both experimental and computational studies have been conducted. The experimental analysis of train-induced unsteady flow is conducted on a 1/20 scale model tunnel and the pressure and air velocity variations with time are presented. The three-dimensional unsteady numerical analysis using the sharp interface method for the moving boundary of an immersed solid was carried out for the same geometric configurations as the experimental analysis. The predicted numerical model results show good agreement with the experimental data.