tunnel air Articles

  • Measurements, model simulations and reduction of CO concentrations inside an urban road tunnel in Milan

    A programme to improve the air quality inside the road tunnels of the Italian city of Milan has involved three steps: 1) evaluation of the air pollution levels inside some tunnels; 2) planning an air improvement project for one tunnel, supported by effectiveness evaluation; 3) implementation of this project. The characterisation of the air quality was carried out by measuring the typical traffic ...


    By Inderscience Publishers

  • Award-winning bioremediation case study

    Tamdown won ‘Best Use of a Single Remediation Technique’ at the 2008 Brownfield Briefing awards for their treatment of this former gasworks in Surrey. After applying Alga Power 101 during the screening process, Tamdown constructed vented biopiles housed in large poly-tunnels. Air was continually circulated through the piles using a low vacuum extraction system, preventing the need for ...


    By A Alga Companhia Limited

  • Wind Tunnel Balance System for Vehicle Aerodynamic Developments

    In vehicle development steps, optimization of aerodynamic properties is often carried out in wind tunnel facilities. The vehicle is placed upon the measuring platform of the balance. The wind tunnel balance now allows the precise measurement of six forces and moments induced by the air flow. The HORIBA wind tunnel balance system can be equipped with a moving ground system which makes the air flow ...


    By HORIBA Europe GmbH

  • Cooling and heating potential of earth-air tunnel heat exchanger (EATHE) for non-air-conditioned building

    A numerical model to predict energy conservation potential of earth-air heat exchanger system and passive thermal performance of building has been developed. This model improves upon previous studies by incorporating effects of ground temperature gradient, surface conditions, moisture content and various design aspects of earth-air-tunnel heat exchanger (EATHE). The model is based on ...


    By Inderscience Publishers

  • Gaseous pollutant dispersion around urban-canopy elements: wind tunnel case studies

    There is an evident lack of reliable and detailed in situ measurement data for verifying numerical predictions of atmospheric dispersion in the urban environment on sub-meso scales. Wind-tunnel studies of dispersion around typical elements of the urban canopy (isolated buildings, groups of buildings, street canyons) could provide valuable substitutes for field datasets. They can achieve a high ...


    By Inderscience Publishers

  • Modelling concentration fluctuations for operational purposes

    We investigated the two first moments of the concentration distribution from a point source release thanks to wind tunnel measurements. The results were analysed with the statistical model from Yee et al. (1994). This model requires two parameters related to the larger scale velocity fluctuations and to the concentration variability due to smaller scale fluctuations respectively. A robust ...


    By Inderscience Publishers

  • Particulate matter and particle-bound polycyclic aromatic hydrocarbons in the Dapu road tunnel in Shanghai

    Airborne Particulate Matter (PM) was collected in a cross-river road tunnel using portable air samplers and a cascade impactor. Sixteen EPA priority Polycyclic Aromatic Hydrocarbons (PAH) in the PM were quantified by gas chromatography/mass spectrometry. Profiles and diagnostic ratios of PAHs were investigated, and size distribution of PM mass and PAHs were discussed. High concentrations of PM2.5 ...


    By Inderscience Publishers

  • A comparison of wind-tunnel experiments and computational simulations of dispersion in the environs of buildings

    A comparison is made between wind-tunnel experiments and computer (CFD) simulations of the dispersion of buoyant and dense gas releases, close to one or more buildings. The simulations were undertaken on a work-station platform, using a standard commercial CFD code, and were subject to realistic constraints on run-times and model sizes. Good agreement is found for the simplest case, although it ...


    By Inderscience Publishers

  • Case-Study: Emission Monitoring in Tunnel Using Polludrone

    With the massive influx of Pilgrims to Mecca every year, the Abdul Aziz Tunnel in Jeddah faces excessive pollution during the holy month of Ramadan. The authorities thus had to equip the tunnel with air monitoring devices to monitor the pollution level. Oizom stationed Polludrone throughout the tunnel to observe the vehicular emission. The analyzed data helped the authorities to identify the peak ...


    By Oizom Instruments Pvt. Ltd.

  • ADMS 5 Buildings Validation Lee Power Plant Wind Tunnel Study

    1 Introduction The Lee Power Plant wind tunnel study1 [1] featured releases from steam boiler stacks with a common height of 64.8 m affected by a building tier with a height of 42.6 m. The world's largest fluid modelling study chamber at Monash University in Australia was used for these experiments (see plan view in Figure 1). Stable meteorological conditions were simulated by ...

  • The all NEW TunnelTech 305 Air Flow Monitor

    With over 30 years’ experience in the tunnelling market, CODEL are excited to have recently launched the 6th generation single point flow monitor utilising the very latest ultrasonic technology. CODEL’s tunnel monitoring products simplify the challenge of sourcing, installing and maintaining a highly accurate and reliable tunnel monitoring solution. The TunnelTech 305 offers low ...


    By Codel International Ltd

  • Local mass transfer coefficients over idealised two–dimensional urban street canyons

    In view of the large number of urban inhabitants, ventilation and pollutant transport in urban areas are major research problems for several decades. This paper focuses on the studies of the correlation between the ventilation and pollutant removal over idealised two–dimensional urban street canyons using wind tunnel experiments in the Department of Mechanical Engineering, The University of Hong ...


    By Inderscience Publishers

  • Air demand in gated tunnels – a Bayesian approach to merge various predictions

    High flowrate through gated tunnels may cause critical flow conditions, especially downstream of the regulating gates. Aeration is found to be the most effective and efficient way to prevent cavitation attack. Several experimental equations are presented to predict air demand in gated tunnels; however, they are restricted to particular model geometries and flow conditions and often provide ...


    By IWA Publishing

  • Comparing the impact of a road tunnel vs. a road viaduct by means of an integrated exposure assessment

    Using the MOBILEE methodology, we performed a detailed air quality assessment for three scenarios for the ring road around Antwerp, a major city in Belgium, using PM

    10 and NO
    x emission inventories for 2003 (reference) and 2015 (projected future situation), followed by an assessment of the ...


    By Inderscience Publishers

  • Effect of roughness inhomogeneities on the development of the urban boundary layer

    Wind tunnel measurements over a regular array of cubes were carried out to investigate the influence of surface inhomogeneities on the development of the urban boundary layer. Two idealised cases were investigated. The first one was in terms of a strong step change in roughness from very smooth to very rough with a low turbulent approach flow and a thin approach boundary layer. For this case it ...


    By Inderscience Publishers

  • Development of a low-rise industrial source dispersion model

    In Japan, with amendment of the Air Pollution Control Law in May 1996, various substances, including benzene and trichloroethylene, were newly designated as hazardous air pollutants, and environmental standards were established. In this situation, it is necessary to develop a dispersion model that is applicable to environmental impact assessment of industrial areas with a complex of factory ...


    By Inderscience Publishers

  • A Lagrangian dispersion model with chemical reactions

    A Lagrangian stochastic (single particle) model is modified in order to account for simple chemistry reactions and tested against measured wind tunnel data. These data refers to a reactive plume generated by a single point source of NO inside a turbulent grid flow doped with ozone. The comparisons were made at different distances from the emission considering all the substances involved in the ...


    By Inderscience Publishers

  • Sensitivity analysis of a concentration fluctuation model to dissipation rate estimates

    Lagrangian dispersion models require estimates of the local dissipation rate (ε) of turbulent kinetic energy (κ). In this study, we evaluate the sensitivity of a Lagrangian model to different estimates of ε in simulating passive scalar dispersion in a turbulent boundary layer over a rough surface. Two different estimates of ε are used to simulate pollutant dispersion ...


    By Inderscience Publishers

  • Effects of trees on the dilution of vehicle exhaust emissions in urban street canyons

    In order to investigate the natural ventilation and air quality of urban street canyons with trees, boundary layer wind tunnel studies at a small-scale model have been performed. Concentrations in street canyons with a tracer gas emitting line source at the ground level and one row of trees arranged along the canyon centre have been measured for several equidistant tree spacings. In the case of ...


    By Inderscience Publishers

  • 3D stream and vortexes in the urban canopy layer and transport of motor vehicles exhaust gas

    Wind-tunnel experiments were conducted to investigate the transport of motor vehicle exhaust gas in the vicinity of a street. The stream and the vertical and horizontal vortexes in 2D and 3D street canyons were visualised using smoke. They were recorded by video camera and the transport of the exhaust gas by vortexes was then investigated. The vertical vortex plays a significant role in the ...


    By Inderscience Publishers

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