ventilation system Articles

  • Alternative Fuels - A Look At the Current Environment

    Overview Vehicles powered by gasoline and diesel account for emissions of dangerous air pollutants and contribute to the presence of greenhouse gases. Consumers, businesses, and public entities looking for environmentally friendly alternatives to gasoline and diesel-powered cars and trucks have viable choices beyond the well-known battery electric and plug-in hybrid electric ...

  • Methane emissions and airflow patterns along longwall faces and through bleeder ventilation systems

    The National Institute for Occupational Safety and Health (NIOSH) conducted an investigation of longwall face and bleeder ventilation systems using tracer gas experiments and computer network ventilation. The condition of gateroad entries, along with the caved materials permeability and porosity changes as the longwall face advances, determine the resistance of the airflow pathways within the ...


    By Inderscience Publishers

  • Six Ways to Improve Indoor Air Quality Now

    Air quality is an important issue to anyone’s health, and many people don’t realize that their health issues and illnesses could be significantly diminished if their air quality was improved. There is much scientific evidence to suggest that the indoor air can be more polluted than the air outdoors, even in industrialized areas. When people spend eight or more hours a day in the same building, ...

  • Thermodynamic analyses of advanced desiccant cooling systems with various configurations

    Six configurations of conventional and advanced desiccant cooling systems are presented, analysed and compared thermodynamically. The advanced systems are modified forms of the conventional systems. These advanced systems are desiccant cooling systems in the ventilation mode (ADV), the modified ventilation mode (ADMV) and the recirculation mode (ADR). For each configuration, a thermodynamic model ...


    By Inderscience Publishers

  • A new exhaust ventilation system design software

    By industries development, the amount of air contaminants that are released in workplace has grown increasingly. To reduce these contaminants, there are several methods that, one of which is control at source. Industrial ventilation is perhaps the most powerful tool available for environmental professionals to control workplace pollution. Exhaust ventilation can capture contaminants at source, ...


    By University of Tehran

  • CFD modelling of sampling locations for early detection of spontaneous combustion in long–wall gob areas

    In this study, computational fluid dynamics (CFD) modelling was conducted to optimise gas sampling locations for the early detection of spontaneous heating in longwall gob areas. Initial simulations were carried out to predict carbon monoxide (CO) concentrations at various regulators in the gob using a bleeder ventilation system. Measured CO concentration values at these regulators were then used ...


    By Inderscience Publishers

  • Use of analytic hierarchy process and fire dynamics simulator to assess the fire protection systems in a tunnel on fire

    The road and rail tunnels are increasing in number. Corresponding to this higher number of tunnels, a higher number of accidents related to safety problems occur. The safety of road and rail tunnels is mostly related to fire safety. Our purpose in this paper is to present a new integrated approach to the analysis of fire safety in tunnels. Using different techniques from the decision support ...


    By Inderscience Publishers

  • CO2 In gyms saves big buck for the Coquitlam school distric case study

    Background The Coquitlam School District has been able to save $10,000 to $15,000 in annual energy costs for each of its schools by installing CO2 based ventilation control in its Gymnasiums and auditoriums. The school district is nestled in the foothills of the Rocky Mountains just outside of Vancouver BC. Besides being blessed with a mild maritime climate (5400 heating degree days, 59 ...

  • Use of CFD Modelling to Optimise the Design of Upper-room UVGI Disinfection Systems for Ventilated Rooms

    AbstractThe installation of upper-room ultraviolet germicidal irradiation (UVGI) devices in ventilated rooms has the potential to reduce transmission of infections by an airborne route. However, the performance of such devices is dependant on several factors including the location of the lamp and the ventilation airflow in the room. This study uses a CFD model to evaluate the performance of UVGI ...


    By SAGE Publications Ltd

  • Gas Detection and Monitoring Systems

    In greenhouse applications, the accurate measurement of a number of environmental parameters such as carbon dioxide concentration, temperature, light intensity, water, humidity, pH and nutrient levels using sophisticated sensors is used to create a controlled environment for optimising plant growth rates while minimising energy usage. Carbon dioxide concentration is also one of the best ...


    By Edinburgh Sensors Ltd

  • The integrated effect of medical lamp position and diffuser discharge velocity on ultra-clean ventilation performance in an operating theatre

    AbstractThe ventilation system of an operating theatre (OT) in a hospital needs to provide a comfortable and healthy surgical environment, particularly to minimise the risk of airborne infection. Engineering standards are available to outline specialised ventilation design and installation requirements based on knowledge accumulated from quality research and day-to-day practices. In this paper, ...


    By SAGE Publications Ltd

  • A dynamic ventilation model for gravity sewer networks

    To implement any effective odour and corrosion control technology in the sewer network, it is imperative that the airflow through gravity sewer airspaces be quantified. This paper presents a full dynamic airflow model for gravity sewer systems. The model, which is developed using the finite element method, is a compressible air transport model. The model has been applied to the North Head ...


    By IWA Publishing

  • Extraction of many emission sources in extensive factory premises - Case Study

    Example: Packaging Similar tasks: Coating, Automobile industry, paint production Different production processes lead to decentralised ventilation of emission sources. These decentralised ventilations are consolidated within a central air pollution control system. A producer of plastic, cardboard and composite material packages uses a range of printing units, laminating machines ...

  • CFD modelling of nitrogen injection in a longwall gob area

    This paper describes computational fluid dynamics (CFD) simulations conducted to investigate the effectiveness of N2 injection in an active panel and a sealed longwall gob area to prevent and suppress spontaneous heating of coal using various injection locations and flow rates. In the active panel simulations, a single longwall panel with a bleederless ventilation system was ...


    By Inderscience Publishers

  • Design of passive cooling system for a building in composite climatic conditions in India

    A combined solar chimney?wind tower concept has been developed for a typical urban institution building in Delhi. Due to site limitations, the concept of solar chimney based ventilation has been introduced through roof mounted thermo-siphon air panels of 70 m? absorber area. A wind tower provided on the suction side of fresh air has potential for cooling incoming air by 5?C by using 250 m? of ...


    By Inderscience Publishers

  • Critical review on hospital surgical room and mechanical system designs

    The design of HVAC systems for surgical operating rooms requires specific guidance for the design engineer in order to insure that thermal comfort and sepsis control are maintained at all times in order to protect the occupants of the room. Operating room ventilation has been through significant design improvements from the beginning of the 20th century until now. Researchers have found that the ...


    By Inderscience Publishers

  • A road map for emerging low-exergy HVAC systems

    An exergy-conscious life cycle costing algorithm was developed. This algorithm establishes a reference tool to compare conventional air conditioning systems with alternative HVAC systems, which can directly operate with low-exergy alternative energy resources. The cost of exergy waste in conventional heating, ventilating, and air-conditioning systems (HVAC) is included in terms of the difference ...


    By Inderscience Publishers

  • What is a Breathing or Respiratory Zone?

    In the past, vehicle exhaust gas detectors have been installed on or near the ceiling. In contrary, Critical Environment Technologies Canada Inc. (CETCI) has always recommended that they be installed in the breathing zone. Recently, Quebec’s regulation has reinforced CETCI’s recommendations. It states that “dusts, gases, fumes, vapours and mists found in the workplace ...

  • Monitoring and control of CO emissions in parking structures

    Until recent years most parking garage owners and managers did not realize the detrimental effects that carbon monoxide emissions from motor vehicles have on the air quality inside parking garages. With increasing awareness of indoor air quality, astute parking garage owners and managers place great importance on the reduction of CO in parking garages. Ventilation systems are a must for today's ...


    By Conspec Controls Limited

  • How Downdraft Tables Change Your Work Environment

    Working with metal and wood results in the release of harmful dust particles into the atmosphere, which is dangerous to the workers’ health. Continuous exposure to these particles means your employees will be breathing in the dust, which can lead to both short and long term health problems. In order to maintain the health and safety of your employees in the workplace, downdraft tables must ...


    By ProVent, LLC

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