air analysis Articles

  • Exergy analysis of the solar thermochemical cycle for capturing CO2 from air

    This paper presents exergy analysis of the novel solar thermochemical cycle for CO2 capture from ambient air. The exergy balance, the degree of the thermodynamic perfection, the influence coefficient and the exergy efficiency are determined for every element of the system. The proposed system has rather low exergy efficiency of 4.8%, mainly owing to the primary purpose of this system to capture ...


    By Inderscience Publishers

  • Exergy analysis of advanced transcritical CO2 air conditioning cycles

    The energy and exergy balance methods were performed on two advanced transcritical CO2 air conditioning cycles presented in the literature. In addition to the basic transcritical CO2 air conditioning cycle which has five main components, compressor, gas cooler, evaporator, expansion valve and internal heat exchanger, two advanced cycles are investigated; both have two-stage compressor (low stage ...


    By Inderscience Publishers

  • News on Air 2013, Volume 3: Products for Analysis and Quantification

    Welcome to the third volume of our News On Air bulletin. This edition focuses on the often overlooked and neglected, but one of the most crucial steps in the analytical workflow: selecting the correct reagents and analytical reference materials for your application. In this edition, you can get tools to help you select applications for air sampling; find air and emmissions proficiency testing ...


    By MilliporeSigma

  • Sensitivity analysis of indoor air exergy with environment reference state in China

    This paper analyses the exergy of air in the building affected by the reference state, considering parameters of temperature and humidity of air. Taking TMY data of 25 typical cities in different building thermal climate zones of China and considering the chemical and physical exergy of air, the exergy of air in the building influenced by the dynamic and static reference state is comparatively ...


    By Inderscience Publishers

  • Evaluating Guidelines for Air Sampling Methods Utilizing Chromatographic Analysis

    The following evaluation guidelines were developed to provide chemists of the Methods Development Team with a uniform and practical means for evaluating sampling and analytical methods that utilize chromatographic techniques. The guidelines define sampling and analytical parameters, specify required laboratory tests, statistical calculations, and criteria for acceptance, and provide a detailed ...

  • One-step analysis of bubble-particle capture interaction in dissolved-air flotation

    The capture of particles by air microbubbles in dissolved air flotation has been analysed using a one-step (holistic) approach, which numerically solved the motion equation (with the inclusion of microhydrodynamic resistance functions and surface forces) for both the bubble-particle collision and attachment interactions. Model predictions with the inclusion of non-DLVO attractive surface force ...


    By Inderscience Publishers

  • Polyurethane Foam as an Effective Adsorbent for Pesticides in Air (GC Analysis)

    Polyurethane foam (PUF) is a lightweight, easy-to-use material for sampling pesticides in air. Low back pressure allows sampling times and representative samples. A PUF filter cartridge designed to attach to the front of an ORBO-1000 PUF sampling cartridge traps aerosols and particulate matter, is easily and conveniently assembled, and can be removed from the ORBO-1000 cartridge and capped ...


    By MilliporeSigma

  • Analysis of the impact of the new Athens airport on urban air quality with contemporary air pollution models

    The new airport of Athens will be constructed in the Spata area to the east of the Athens basin. In an attempt to reveal how the airport operation will influence air quality in Athens, the transport of air pollutants in the Athens basin and the Spata area is studied by applying a set of contemporary models, all constituents of the European Zooming Model (EZM). Simulations were performed for ...


    By Inderscience Publishers

  • Air quality modelling: an investigation of the merits of CMAQ in the analysis of trans-boundary air pollution from continents to small islands

    The purpose of this study is to conduct an air quality modelling assessment of trans-boundary air pollutants from the Asian continent by applying an advanced modelling system – the Community Multi-scale Air Quality (CMAQ) – developed by the US Environmental Protection Agency (USEPA). The focus of the study is trans-boundary ozone, Particulate Matter (PM), and acid deposition, using selected ...


    By Inderscience Publishers

  • Analysis of precious metals in jewelry

    Abstract For thousands of years, man learned the craft of making jewelry from gold. Gold is a noble metal which does not react with the air and has a shiny yellow color.Over the years, alloying of the gold was necessary to improve its properties since pure gold is too soft to be used for jewelry. Alloying of the gold is usually by low-cost metals such as copper, zinc, silver or nickel. ...


    By Xenemetrix Ltd.

  • Exergy analysis of process heaters

    A thermodynamic analysis is proposed to investigate the entropy generation in process heaters. It is found that the major portion of the exergy losses occur in the stack. It is also found that the excess air decreases the first law efficiency while the second law efficiency remains nearly constant. Although the first law efficiency is found to be of the order of 70-90%, the second law efficiency ...


    By Inderscience Publishers

  • Exergy analysis of SI engines

    In this study, exergy (availability) analysis of a Spark Ignition (SI) engine has been performed theoretically during compression, combustion and expansion processes of the engine cycle. For this purpose, a thermodynamic-based engine cycle model is developed without considering the geometric features of fluid motion. Through the analysis, the effects of changing some design and operating ...


    By Inderscience Publishers

  • CFD Analysis of Gas Cooling

    In many industrial processes, hot gas is cooled down due to the evaporation (boiling) of sprayed droplets. The effects of two different atomizer types, inner mixing air atomizing nozzles and flow back nozzles, on the cooling behavior inside a spray tower for a typical flue gas are discussed. The heat and mass transfer is computed using computational fluid dynamics (CFD). The interaction between ...


    By Spraying Systems Co.

  • Economic Analysis of Environmental Externalities

    ' Economic analysis of pollution prevention and abatement measures requires estimating the potential benefits from controlling pollution as well as the better-known costs of new equipment or processes. This note discusses the economic analysis of environmental externalities, using a wide range of valuation techniques.' Industrial activities often produce various pollutants; these include air and ...


    By The World Bank

  • Modeling Analysis of Fuel Sprays

    Current engine development processes in which computations play an important role have sought for numerical models which can accurately represent phenomena in spray combustion. The authors have developed original sub-models taking into account the effects of extensive spray combustion phenomena including nozzle cavitation, droplet breakup behavior, multi-component evaporation process, spray-wall ...


    By HORIBA Europe GmbH

  • Advanced gas analysis - on the go

    The field of ambient air analysis - monitoring industrial and other environments for harmful concentrations of gases - has traditionally faced a technology limitations: Would you prefer a complete and reliable tool, which will be bulky, complicated and inconvenient? Or would you like a nice portable one that's simple and lightweight, but unreliable and limited in its capability? Truly complete ...


    By HHCS Handheld USA Inc.

  • Compost Data Tracking And Analysis

    From tip fee invoice tracking to process control to compost product sampling, information gathering, analysis and reporting are key to successful facility operations.   COMPOSTING is a highly regulated component ...


    By BioCycle Magazine

  • Evaluation of the equations of state for air, nitrogen and oxygen on throttle reduction efficiency by using exergy analysis

    Exergy (available energy) analysis was applied to calculate the efficiency of throttling process by using some of equations of state. Differences between calculations by using three equations of state, Soave?Redlich?Kwong (S?R?K), Van der Waals and Beattie?Bridgeman on three substances air, nitrogen and oxygen are shown. The calculations for nitrogen are found to be close to air because almost ...


    By Inderscience Publishers

  • A simple and fast micromethod for the analysis of polychlorinated biphenyls in air by sorbent enrichment and ultrasound-assisted solvent extraction

    Abstract  A combination of sorbent enrichment and ultrasound-assisted solvent extraction has been used to determine polychlorinated biphenyls in air. Analytes were sampled by pumping a known volume of air through a porous polymer (Tenax TA). The enriched adsorbent was transferred into a glass vial, and ultrasound-assisted extraction of the analytes was then performed in ...


    By Springer

  • Analysis of an anomalous case of high air pollution concentration in Turin after a foehn event

    A case of unusually high concentrations of some urban air pollutants (CO, NO, SO2) in Turin (Northwestern Italy) is presented. This episode occurred during the late afternoon of 7 November 1995. This day was characterised by a strong northern foehn event in the morning, which followed the passage of a cold front. The analysis has been carried out by means of data derived from the urban and ...


    By Inderscience Publishers

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