| DOI: | 10.1016/j.atmosenv.2015.03.020
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| Scopus记录号: | 2-s2.0-84926303912
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| 论文题名: | The near-source impacts of diesel backup generators in urban environments |
| 作者: | Tong Z; , Zhang K; M
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| 刊名: | Atmospheric Environment
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| ISSN: | 0168-2563
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| EISSN: | 1573-515X
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| 出版年: | 2015
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| 卷: | 109 | | 起始页码: | 262
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| 结束页码: | 271
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| 语种: | 英语
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| 英文关键词: | Atmospheric stability
; CFD
; Distributed generation
; Emergency generator
; Micrometeorology
; Plume dispersion
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| Scopus关键词: | Air intakes
; Air quality
; Atmospheric movements
; Boundary layers
; Computational fluid dynamics
; Distributed power generation
; Emission control
; Environmental impact
; Health risks
; Large eddy simulation
; Meteorology
; Risk perception
; Tall buildings
; Urban planning
; Atmospheric stability
; Complex urban environments
; Demand response programs
; Emergency generator
; Micrometeorology
; Plume dispersion
; Pollutant concentration
; Surrounding environment
; Air pollution
; air quality
; concentration (composition)
; demand-side management
; diesel
; electricity generation
; environmental impact
; exhaust emission
; large eddy simulation
; particulate matter
; pollution monitoring
; urban ecosystem
; air pollutant
; air pollution control
; air quality
; Article
; boundary layer
; diesel engine
; environmental impact
; generator
; heat transfer
; plume dispersion
; priority journal
; urban area
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| Scopus学科分类: | Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
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| 英文摘要: | Distributed power generation, located close to consumers, plays an important role in the current and future power systems. However, its near-source impacts in complex urban environments are not well understood. In this paper, we focused on diesel backup generators that participate in demand response (DR) programs. We first improved the micro-environmental air quality simulations by employing a meteorology processor, AERMET, to generate site-specific boundary layer parameters for the Large Eddy Simulation (LES) modeling. The modeling structure was then incorporated into the CTAG model to evaluate the environmental impacts of diesel backup generators in near-source microenvironments. We found that the presence of either tall upwind or downwind building can deteriorate the air quality in the near-stack street canyons, largely due to the recirculation zones generated by the tall buildings, reducing the near-stack dispersion. Decreasing exhaust momentum ratio (stack exit velocity/ambient wind velocity) draws more exhaust into the recirculation zone, and reduces the effective stack height, which results in elevated near-ground concentrations inside downwind street canyons. The near-ground PM2.5 concentration for the worst scenarios could well exceed 100μgm-3, posing potential health risk to people living and working nearby. In general, older diesel backup generators (i.e., Tier 1, 2 or older) without the up-to-date emission control may significantly increase the pollutant concentration in the near-source street canyons if participating in DR programs. Even generators that comply with Tier-4 standards could lead to PM hotspots if their stacks are next to tall buildings. Our study implies that the siting of diesel backup generators stacks should consider not only the interactions of fresh air intake and exhaust outlet for the building housing the backup generators, but also the dispersion of exhaust plumes in the surrounding environment. © 2015 Elsevier Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/81840
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, United States
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| Recommended Citation: | |
Tong Z,, Zhang K,M. The near-source impacts of diesel backup generators in urban environments[J]. Atmospheric Environment,2015-01-01,109
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