Numerical Simulation of Air Distribution and Particle Movement in a Displacement Ventilated Room

2014 ◽  
Vol 919-921 ◽  
pp. 1350-1353 ◽  
Author(s):  
Ze Bei Wang ◽  
Bao Qing Wang ◽  
Rong Hui Chen ◽  
Shu Yao
Keyword(s):  
Numerical Simulation ◽  
Indoor Air ◽  
Particle Distribution ◽  
Simulation Method ◽  
Air Distribution ◽  
Coarse Particles ◽  
Particle Movement ◽  
Displacement Ventilation ◽  
Airflow Field ◽  
New Type

As people spend more time indoors, indoor air quality becomes more and more important. Displacement ventilation, as a new type of air-conditioning strategy, has showed remarkable advantages on many occasions. In this paper, the air movement and particle distribution in a displacement ventilation room is studied and analyzed through CFD numerical simulation method. The results show that the airflow field and the temperature field all have obvious hierarchical structure, and the coarse particles have more obvious settling character.

Investigation of Effects of Baffle Configuration on the Performance of a Fixed-Cone Valve by Gas-Liquid Two-Phase Model

2012 ◽  
Vol 166-169 ◽  
pp. 1824-1829
Author(s):  
W.L. Wei ◽  
B. Lv ◽  
Y.L. Liu ◽  
X.F. Yang
Keyword(s):  
Numerical Simulation ◽  
Energy Dissipation ◽  
Turbulent Flow ◽  
Average Velocity ◽  
Simulation Method ◽  
Velocity Fields ◽  
Two Phase ◽  
Pressure Fields ◽  
New Type ◽  
Conventional Type

Nested type Fixed-Cone Valve, numerical simulation, energy dissipating, turbulent flow Abstract: In this paper, In this paper, a new type of Fixed-Cone Valve was proposed by improving the conventional type Fixed-Cone Valve .The flow fields of the two kinds of Fixed-Cone Valves were studied by using numerical simulation method .The computed pressure fields and the velocity fields were analyzed ,which shows that under the same conditions ,and by using the nested Fixed-Cone valve, the pressure of the upstream pipe and the cone valve and the average velocity along the downstream pipeline are reduced ,but the rate of energy dissipation is increased.

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

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.

Numerical Simulation of Air Distribution of Lateral Supply and Return Pattern Affected by Indoor Heated Source Distribution Models

2014 ◽  
Vol 490-491 ◽  
pp. 854-857
Author(s):  
Ze Qin Liu ◽  
Ning Wang ◽  
Yun Su
Keyword(s):  
Numerical Simulation ◽  
Indoor Air ◽  
Source Distribution ◽  
Air Distribution ◽  
Distribution Models ◽  
Source Models ◽  
Spatially Homogeneous ◽  
Conditioning Room ◽  
Heated Source ◽  
Occupied Zone

In this paper, the numerical simulation was adopted to explore indoor air distribution affected by three typical heated source distribution models, included spatially homogeneous heated source in the room, the heated source distributed evenly at the bottom and the local heated source at the bottom of the room. The characteristics of air distribution effected by three typical heated source models were studied in the air conditioning room with the pattern of lateral supply and return, the scope of rational arrangement in relatively comfortable environment of indoor personnel occupied zone was obtained. The result indicated that, the air distribution with the setting of the spatially homogeneous heated source pattern and the heated source distributed evenly at the bottom pattern were more satisfying than the setting of the local heated source at the bottom pattern.

The Numerical Simulation Research on Garbage Particles in Airflow Field of Horizontal Air-Separator under Different Conditions

2012 ◽  
Vol 518-523 ◽  
pp. 2263-2266
Author(s):  
Xin Le Yang ◽  
Shuo Yang
Keyword(s):  
Numerical Simulation ◽  
Velocity Field ◽  
Flow Field ◽  
Pressure Field ◽  
Internal Flow ◽  
Simulation Method ◽  
Separation Principle ◽  
Simulation Research ◽  
Airflow Field ◽  
Back Mixing

In air-separator’s operating condition, separation trajectory of air-separator’s internal garbage particles was obtained through comparison of ordinary and improved air-separator’s internal flow field in the numerical was simulated by FLUENT soft software and garbage particles’ flow rules and separation principle was revealed. The results show that velocity field and pressure field of improved horizontal air-separator’s changes smoothly and phenomenon of chaos and back-mixing can be avoided, furthermore, it realizes effective sorting for three different quality garbage particles. The numerical simulation method in this paper provides theoretical and technical way for optimizing the air-separator’s internal structure and improving air-separator’s performance.

Numerical Simulation Analysis of Cold Air Distribution System

2016 ◽  
Vol 858 ◽  
pp. 278-281
Author(s):  
Cheng Cai Sun ◽  
Bo Zhou ◽  
Jie Lv
Keyword(s):  
Numerical Simulation ◽  
Physical Model ◽  
Distribution System ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Simulation Method ◽  
Air Distribution ◽  
Indoor Airflow ◽  
Cold Air ◽  
Fluent Software

This paper based on an actual project as an example, researching the application of cold air distribution system by using the numerical simulation method. By using Fluent software to establish a three-dimensional physical model, simplificate the physical model, establish proper tuyere model, choose the appropriate turbulence model, select the appropriate boundary conditions. Then simulate indoor airflow organization, get the distribution of temperature field, velocity field in the working area, and evaluate the comfort in the working area. Though the research, this paper provides the appropriate air distribution which is the upper supply air and on opposite side bottom exhaust air. This paper though the numerical simulation concludes that adopts the appropriate air distribution could meet the requirements of indoor thermal comfort.

scholarly journals On-site measurement and numerical investigation of thermal environment with different air distribution systems in ice arenas

2021 ◽  
Vol 2069 (1) ◽  
pp. 012096
Author(s):  
Wenyu Lin ◽  
Tao Zhang ◽  
Xiaohua Liu ◽  
Lingshan Li
Keyword(s):  
Thermal Environment ◽  
Ventilation System ◽  
Simulation Method ◽  
Extreme Condition ◽  
Air Distribution ◽  
Jet Ventilation ◽  
Displacement Ventilation ◽  
Air Supply ◽  
Temperature And Humidity ◽  
Ice Field

Abstract It is important to strictly maintain the indoor thermal environment in ice arenas which have very different features to other commercial buildings. Separated air distribution system is widely used to create a dry and cold environment near the ice and a comfortable environment in the view stand. The warm and humid air from the view stand may lead to uneven temperature and humidity distribution in the rink, leading to extra energy consumption, even fog and frost on the ice. Unreasonable air supply in the ice rink zone will also make the spectators feel too cold and uncomfortable. Jet ventilation system is the most extensively used system in the ice rink zone. An innovative ground displacement ventilation system is proposed in the National Aquatics Centre, which will serve as the venue for the curling competition in the 2022 Beijing Winter Olympics. On-site measurement in the arena is carried out and computational fluid dynamics (CFD) simulation method is adopted in the present research. Measured thermal environment above the ice with different ventilation systems are compared and analysed. Result shows that the displacement ventilation system features a more obvious vertical stratification than jet ventilation system in this kind of large space buildings, and thus is more energy-efficient. A CFD model of the ice cube is setup and verified by measured data. The thermal environment in the ice rink with displacement ventilation under extreme condition is studied using the simulation method. The temperature and humidity in the ice field increases by 10.1 °C, 4.5 g/kg without air supply in the view stand, proving that the spectators in the view stand have a great impact on the thermal environment in the ice field.

Numerical Simulation of Coal Oil Water Slurry Gasification Process in New-Type Coal Water Slurry Gasifier

2012 ◽  
Vol 229-231 ◽  
pp. 2501-2505 ◽  
Author(s):  
Hai Long Yu ◽  
Feng Kun Wang ◽  
Gui Fang Zhang ◽  
Jian Zhong Liu
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Water Slurry ◽  
Gasification Process ◽  
Coal Water Slurry ◽  
New Type ◽  
The Common ◽  
Oil Water ◽  
Dissolution Ratio ◽  
Effective Component

The gasification process of coal oil water (COW) slurry in new-type coal water slurry(CWS) gasification furnace was studied with numerical simulation method. The temperature and concentration fields were obtained for the gasification furnace. The simulated results showed that the gasification effect of the new-type coal water slurry gasification is better than the common coal water slurry gasification. In the new-type gasification furnace, the average temperature is slightly increased and the carbon translative ratio is increased by 1.81%. The effective component (CO+H2) in coal gas at the outlet of the furnace is increased by 10.58%, and the concentration of CO2and H2O is greatly decreased. The H2O dissolution ratio is greatly increased and the gasification effect is obviously better that that of the common coal water slurry.

Sign in / Sign up

Export Citation Format

Share Document