The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Simulation and experimental study the IAQ (indoor air quality) of air-conditioning classroom in summer condition were carried out. With professional software FLUENT, research model of complicated three-dimensional turbulent flow-field that contained many kinds of ventilation equipments was established. The model visually simulated the changes of distributions of indoor air velocity and air age. The...
Ontology is deemed as an effective means in the field of information integration. However, environmental data, which involves various kinds of data such as spatio-temporal data about air, land, water as well as non nature data about social and economic issues, is quite distinct to general data. Currently how to use ontology for environmental data integration was seldom discussed. This paper presents...
This paper goes up each node representative sample using PHREEQC software , on the flow line, to carry out the calculation of degree of saturation and the inverse hydrochemical simulation , the chemical type whose result shows of the study district underground water belongs to typical dissolve water. In the entire runoff process, dolomite, gypsum and halite are in not saturation state, calcite is...
Based on the acid rain data measured at Shapingba weather station in Chongqing from 1993 to 2007 and the emission data of SO2 in Chongqing, Guizhou and Sichuan, the acid rain change trend and its relationship with SO2 emission were analyzed. The results indicated that in the past 15 years, the change trend of the pH value of the precipitation in Chongqing changed between 3.8 and 4.5. The annual variation...
Volatile organic compounds (VOCs) emitted from larch particleboard at different temperatures were studied in this paper. The small climate chamber and portable VOC gas monitor were used to measure VOCs quantities. Particleboard 1 (with hot-pressing time 3.5 min and hot-pressing pressure 35 MPa) and particleboard 2 (with hot-pressing time 2.7 min and hot-pressing pressure 30 MPa) were respectively...
In this paper, FLUENT software was used to simulate the burning process in a utility boiler. Chose the kinetics/diffusion-limited as combustion model, discrete ordinates as radiation model, realizable model as viscous model, PDF model as combustion turbulent flow model, and two step mode as soot mode. Numerical calculation of soot was done. The soot distribution along with furnace height and in the...
In order to develop an effective technical methodology for environmental pollution data management and modeling, this paper propose an integrated framework for pollution modeling based on the GIS database. Three layers, including the pollution data management layer, the modeling and analysis layer, and the application layer, construct the complete framework. Design issues of the framework are discussed...
A numerical investigation is conducted on particle distribution in the wake of dilute particle-laden airflows past a group of four rectangular buildings at Reynolds number of 10,000,000. In the numerical method, the Discrete Vortex Method is employed to calculate the unsteady airflow fields and a Lagrangian approach is applied for tracking individual solid particles. A dispersion function is adopted...
Increasing attention has been paid recently to the radioactive gas-220Rn (thoron) which arouses concern on indoor air quality and human health. A new method of measuring indoor thoron has been illustrated and used to investigate the indoor thoron spatial distribution. The new method realizes fast and reliable measurement of indoor thoron. The thoron concentration is found to decrease exponentially...
The purpose of this study is to reveal the concentration variations of TVOC and formaldehyde with different types of building and furniture materials under different indoor environment conditions, and consequently provide basic guideline for the selection of indoor materials and the control of main indoor contaminants. A model test room with the size of L × W × H=3.4 × 2.9 × 2.95 m3 was built, and...
This paper gives an overview of the sensitivity of AERMOD by comparing the simulated concentrations of SO2 under different model options with the corresponding observed concentrations. While the influence of meteorological conditions on the performance of AERMOD is noticeable, the urban/rural dispersion coefficients and the terrain conditions have only a limited influence on the results from AERMOD...
Numerical simulation was carried out on the High Temperature Air Combustion of coal gas in an industrial furnace with a multi-jet burner. A Beta-function PDF (Probability Density Function) combustion model was selected to simulate the gas combustion combined with the standard k-ε turbulent model. The radiation was simulated by a Discrete Ordinates method. Thermal NOx model was used to calculate NO...
A calculation method combining a simple energy balance model and CFD simulation is proposed in this paper to study the thermal effects on pollutant dispersion in real street canyons. The surface temperature calculated by the independent energy balance model can be used as thermal boundary by CFD simulation. Using the combination calculation method, the wind flow and pollutant transport inside an idealized...
The average level of indoor radon concentration for the residence in the uranium ore district is 282Bq/m3 and the maximum value can up to 570Bq/m3 which exceed the national top limited value (200Bq/m3). Indoor radon pollution of the residence is very serious. In order to find out the reason of radon pollution, the main environmental factors are investigated. Through the calculations of Gaussian atmospheric...
The climate effects of black carbon (BC) aerosol due to anthropogenic and biomass burning emission over East Asia in spring time from year 2000 to 2004 have been simulated. the net downward radiative flux at top of atmosphere (TOA) in both clear and all sky are increased by BC, but it is decreased at the surface (SRF). The changes of radiation in the Si Chuan basin can reach 4W/m2 at TOA, and -5.5W/m...
The formaldehyde instantaneous concentration formula at a specific air exchange rate before the environment cabin is in the stable state is theoretically obtained, based on the basic formula of the formaldehyde concentration in the environment test cabin simulated as the indoor environment. The formaldehyde instantaneous concentration formula has been confirmed in the experiment about the relationship...
Based on the ISCST3 model and the health risk assessment model recommended by U.S.EPA, a new health risk assessment of atmospheric environment was set up for hazardous wastes landfill disposal. The atmospheric environmental health risks of the electroplating sludge into the general industrial solid waste landfill were evaluated to verify the effectiveness of this method. The results showed that this...
Nitrogen oxide (NOx) is one of main pollutants emitted from coal fired power plants and is a significant pollutant source in the environment. Therefore, the monitoring or prediction of NOx emissions is an indispensable process in coal-fired power plant so as to control NOx emissions. In this paper, NOx emissions modeling for real-time operation and control of a 300MWe coal-fired power generation plant...
Harmful substances emitting from aluminum electrolysis process may pollute the environment. Ventilation is the effective means to control the hazards. In order to obtain the best ventilation effect for 300kA aluminum electrolysis plant, CFD method is used to simulate and optimize the workshop ventilation. Based on theoretical analysis and preliminary calculation, a 3D model is built, five kinds of...
Environmental capacity is the most important constraint and precondition of regional development. Presently, regional development planning and environmental management are aiming to carry out planning based on pollutants total amount control, and speed up the processes of layout and approval of new projects. For this point, this paper proposed the division of land suitability for regional development,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.