Numerical Evaluation of the Performances of the Ventilation System in a Blast Furnace Casthouse

Abstract The blast furnace casthouse is a typical heavy-polluting factory building of a steel enterprise. During the tapping process and the taphole opening, the dust concentration in the factory building's workroom can reach tens of thousands mg/m³. Over time, the air pollutants in the workplace can have unwanted consequences on employees' health. This paper selected a typical blast furnace tapping workshop and measured on-site the characteristics of the wind speed distribution, temperature distribution, and soot concentration distribution during the taping period. A numerical simulation model was established to analyze the taphole smoke exhaust system's performance based on computational fluid dynamics. The findings are: the velocity, temperature, and smoke density distributions in the workplace were very uneven, and the thermal comfort of the workers' area was relatively poor. Also, the concentration of PM2.5 was mostly below 80μg/m³. Besides, due to the plant's on-site measurement, real data was obtained for numerical simulation verification, making the evaluation of the entire plant's ventilation performance more reliable. Hence, this article's finding provides a scientific basis for optimizing the air distribution in the blast furnace cast house's workplace.

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Transient Numerical Simulation for Air Distribution of Air Conditioning and Ventilation in Subway Island-Platform

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.3107 ◽

2011 ◽

Vol 250-253 ◽

pp. 3107-3114

Author(s):

Hong Ming Fan ◽

Kai Yuan He ◽

Zhi Fang Yin ◽

Dan Zhang

Keyword(s):

Numerical Simulation ◽

Air Conditioning ◽

Thermal Environment ◽

Ventilation System ◽

Simulation Method ◽

Subway Station ◽

Air Distribution ◽

Wind Effect ◽

Piston Effect ◽

Transient Numerical Simulation

The typical subway island-platform of Beijing as research object was present in the article. Taking two-equation turbulence model and giving boundary conditions of piston wind and train heat load change with the time, adopting numerical method simulates air distribution of air-conditioning and ventilation system in subway. The results indicate that piston wind effect has significant impact on the area of platform entrance and staircase entrance while station with safety doors can obstruct piston effect at a certain degree. Simultaneity, the supply- exhaust air system offers relatively uniform temperature and velocity field, which meets requirements of transitory comfort for passengers. It is found that numerical simulation method can simulate and forecast air distribution of air conditioning and ventilating system in subway station. In conclusion, it can provide the reference for optimizing air-conditioning and ventilation system, improving thermal environment designing of subway station.

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Comparison of Air Distribution of Induced Ventilation System's Different Exhaust Way in Underground Garage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.805-806.1547 ◽

2013 ◽

Vol 805-806 ◽

pp. 1547-1550

Author(s):

Shao Wen Shang ◽

Yan Xing

Keyword(s):

Numerical Simulation ◽

Ventilation System ◽

Pollutant Concentration ◽

Simple System ◽

Air Distribution ◽

Increasing Trend

Induced ventilation system with the advantages of simple system and convenient installation has been widely used in China's underground garage ventilation design and showed an increasing trend. In this paper, the numerical simulation is done to the different air exhaust way of induction ventilation system of an underground garage. The two air exhaust ways are upper exhaust and upper 1/3 and lower 2/3. By analyzing airflow organization and pollutant concentration of the two exhaust ways, we can derive that upper 1/3 and lower 2/3 air exhaust way is conducive to the discharge of pollutants.

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Experimental Investigation of the Ventilation Performance of Different Air Distribution Systems in an Office Environment—Cooling Mode

Energies ◽

10.3390/en12071354 ◽

2019 ◽

Vol 12 (7) ◽

pp. 1354 ◽

Cited By ~ 2

Author(s):

Arman Ameen ◽

Mathias Cehlin ◽

Ulf Larsson ◽

Taghi Karimipanah

Keyword(s):

Distribution System ◽

Distribution Systems ◽

Ventilation System ◽

Impinging Jet ◽

Air Distribution ◽

Displacement Ventilation ◽

Cooling Mode ◽

Distribution Method ◽

Ventilation Performance ◽

Velocity Turbulence

The performance of a newly designed corner impinging jet air distribution method with an equilateral triangle cross section was evaluated experimentally and compared to that of two more traditional methods (mixing and displacement ventilation). At nine evenly chosen positions with four standard vertical points, air velocity, turbulence intensity, temperature, and tracer gas decay measurements were conducted for all systems. The results show that the new method behaves as a displacement ventilation system, with high air change effectiveness and stratified flow pattern and temperature field. Both local air change effectiveness and air exchange effectiveness of the corner impinging jet showed high quality and promising results, which is a good indicator of ventilation effectiveness. The results also indicate that there is a possibility to slightly lower the airflow rates for the new air distribution system, while still meeting the requirements for thermal comfort and indoor air quality, thereby reducing fan energy usage. The draught rate was also lower for corner impinging jet compared to the other tested air distribution methods. The findings of this research show that the corner impinging jet method can be used for office ventilation.

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NUMERICAL SIMULATION OF VENTILATION SYSTEM WITHIN AN ARMORED VEHICLE CABIN

Journal of Flow Visualization and Image Processing ◽

10.1615/jflowvisimageproc.v14.i2.50 ◽

2007 ◽

Vol 14 (2) ◽

pp. 201-223

Author(s):

Chin-Lung Chang ◽

Chang-Hsien Tai ◽

Chien-Hsiung Tsai ◽

Yu-Ren Wang ◽

Qing-Shan Hon

Keyword(s):

Numerical Simulation ◽

Ventilation System ◽

Vehicle Cabin ◽

Armored Vehicle

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Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

Engineering and Technology Journal ◽

10.30684/etj.v38i9a.875 ◽

2020 ◽

Vol 38 (9A) ◽

pp. 1257-1275

Author(s):

Wisam M. Mareed ◽

Hasanen M. Hussen

Keyword(s):

Air Quality ◽

Indoor Air Quality ◽

Indoor Air ◽

Ventilation System ◽

Thermal Conditions ◽

Airflow Rate ◽

Air Conditioner ◽

Breathing Zone ◽

Lecture Room ◽

Ventilation Performance

Elevated CO2 rates in a building affect the health of the occupant. This paper deals with an experimental and numerical analysis conducted in a full-scale test room located in the Department of Mechanical Engineering at the University of Technology. The experiments and CFD were conducted for analyzing ventilation performance. It is a study on the effect of the discharge airflow rate of the ceiling type air-conditioner on ventilation performance in the lecture room with the mixing ventilation. Most obtained findings show that database and questionnaires analyzed prefer heights between 0.2 m to 1.2 m in the middle of an occupied zone and breathing zone height of between 0.75 m to 1.8 given in the literature surveyed. It is noticed the mismatch of internal conditions with thermal comfort, and indoor air quality recommended by [ASHRAE Standard 62, ANSI / ASHRAE Standard 55-2010]. CFD simulations have been carried to provide insights on the indoor air quality and comfort conditions throughout the classroom. Particle concentrations, thermal conditions, and modified ventilation system solutions are reported.

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