Large Size Static Pressure Box Airflow Distribution

2013 ◽  
Vol 756-759 ◽  
pp. 4433-4438
Author(s):  
Guo Dan Liu ◽  
Xin Xin Wang ◽  
Xuan Wang ◽  
Feng Qi ◽  
Gang Wang ◽  
...  
Keyword(s):  
Static Pressure ◽  
Heat Insulation ◽  
Simple Algorithm ◽  
Air Distribution ◽  
Large Size ◽  
Air Supply ◽  
Airflow Distribution ◽  
Distribution Mode ◽  
Fluent Software ◽  
Rng Turbulence Model

This paper mainly studies at the different way of ventilation to the influence of air distribution in the large size plenum. The model is a grand theatre stalls. To model the plenum which under the grand theatre stalls,and took out the size of large mutations alone modeling and studying it. the six different way of ventilation: small plenum with four directions supply air; Take a duct with four tuyere on supply air; Single tuyere withside air supply; Tuyere parallel supply air; Single tuyere with air supply under; Take a duct with four draught under supply air have influence of air distribution.And combined with the well of heat insulation in the large size plenum.It can use the standard RNG turbulence model, and the pressure interpolation adopt standard discrete format, the convection item of the momentum equations, k equation, ε equation adopt with second order the format. the pressure speed coupling adopt Simple algorithm. Finally through the FLUENT software were used. It can use the air balance coefficient wich is one evaluation index to analyz Simulation results of the Six air distribution mode . Through the analysis and comparison with a wind that four tuyere air supply under Static pressure boxair supply the best effect, the static pressure air distribution most evenly

Performance Evaluation of the Upside Air-Supply Bottom-Side Air-Return Air Distribution Mode

2012 ◽  
Vol 468-471 ◽  
pp. 2513-2516
Author(s):  
Jiu Ru Li ◽  
Shu Ling Jia ◽  
Yan Wang ◽  
Xiang Peng Kong ◽  
Ming Tao Xu
Keyword(s):  
Indoor Air ◽  
Three Dimensional ◽  
Air Distribution ◽  
Air Supply ◽  
Distribution Mode ◽  
Bottom Side ◽  
Field Velocity ◽  
Indoor Air Flow ◽  
Object Of Study ◽  
Physical And Mathematical Models

It took the air-conditioned room as a object of study, and established indoor air flow three-dimensional physical and mathematical models on the basis of the two-equation turbulence model and wall-function. By the numerical simulation of two different forms of upside air-supply bottom-side air-return air distribution modes, indoor air temperature field, velocity field and molecular trace field were obtained, whereby we evaluated the ventilation characteristics of the two kinds of air distribution modes.

Simulation of Air Distribution on Inlet Section of Wet-ESP

2013 ◽  
Vol 437 ◽  
pp. 231-235
Author(s):  
Ying Gao ◽  
Juan Wei ◽  
Xing Chun Yang ◽  
Qiang Li
Keyword(s):  
Electrostatic Precipitator ◽  
Porous Plate ◽  
Simple Algorithm ◽  
Element Model ◽  
Dust Particles ◽  
Air Distribution ◽  
Inlet Section ◽  
Two Phase ◽  
Airflow Distribution ◽  
Wet Esp

Based on the theory of two-phase flow, the flow field of dust particles inside the wet electrostatic precipitator with SIMPLE algorithm was modeled used a standard turbulence model and simulated numerically. Establishment of finite element model for the entity porous plate was done with grid refined locally. The number and installation position of porous plates, the diverging angle of the horn inlet and the opening rate of air distribution plates were changed in this simulation. And the studies on the airflow distribution of the inlet section were performed, in which the flow of key parameters for air flow uniform distribution are given. The experimental verification of optimal results of simulation model suggested that the simulation results and the experimental results were coincident.

Numerical Simulation of Indoor Thermal Environment of a Double-Skin Facade Office with Different Shutter Angles

2014 ◽  
Vol 694 ◽  
pp. 256-259
Author(s):  
Xin Zhan ◽  
Hua Yang ◽  
Feng Yun Jin
Keyword(s):  
Heat Transfer ◽  
Thermal Environment ◽  
Ventilation Rate ◽  
Air Distribution ◽  
Indoor Thermal Environment ◽  
Double Skin ◽  
Computational Fluid Dynamics Cfd ◽  
Heat Transfer Simulation ◽  
Shading Devices ◽  
Rng Turbulence Model

Airflow and heat transfer simulation was conducted for a double-skin façade (DSF) system equipped with shading devices in the cavity, using computational fluid dynamics (CFD) with RNG turbulence model and PISO algorithm, for five conditions of slat angles (θ=0°, 30°, 45°, 60°, 90°). The present study indicates that the presence of shading devices influences the temperatures, the ventilation rate and the air distribution in the DSF system. Besides, the different angles will make different influences.

Effect of Air Distribution on Solid Fuel Bed Combustion

1997 ◽  
Vol 119 (2) ◽  
pp. 120-128 ◽  
Author(s):  
J. T. Kuo ◽  
W.-S. Hsu ◽  
T.-C. Yo
Keyword(s):  
Combustion Efficiency ◽  
Pollutant Emissions ◽  
Air Distribution ◽  
Gas Temperature ◽  
One Dimensional ◽  
Supply And Distribution ◽  
Air Supply ◽  
Burning Rates ◽  
Side Walls ◽  
Detailed Chemical

One important aspect of refuse mass-burn combustion control is the manipulation of combustion air. Proper air manipulation is key to the achievement of good combustion efficiency and reduction of pollutant emissions. Experiments, using a small fix-grate laboratory furnace with cylindrical combustion chamber, were performed to investigate the influence of undergrate/sidewall air distribution on the combustion of beds of wood cubes. Wood cubes were used as a convenient laboratory surrogate of solid refuse. Specifically, for different bed configurations (e.g., bed height, bed voidage, bed fuel size, etc.), burning rates and combustion temperatures at different bed locations were measured under various air supply and distribution conditions. One of the significant results of the experimental investigation is that combustion, with air injected from side walls and no undergrate air, has the maximum combustion efficiency. On the other hand, combustion with undergrate air achieves higher combustion rates but with higher CO emissions. A simple one-dimensional model was constructed to derive correlation of combustion rate as a function of flue gas temperature and oxygen concentration. Despite the fact that the model is one-dimensional and many detailed chemical and physical processes of combustion are not considered, comparisons of the model predictions and the experimental results indicate that the model is appropriate for quantitative evaluation of bed-burning rates.

scholarly journals Numerical Simulations of Heat Transfer Phenomena through a Baffled Rectangular Channel

2021 ◽  
Vol 6 (5) ◽  
pp. 1230-1241
Author(s):  
Sandip Saha ◽  
Pankaj Biswas ◽  
Apurba Narayan Das
Keyword(s):  
Rectangular Channel ◽  
Simple Algorithm ◽  
Convective Heat Exchange ◽  
Thermal Exchange ◽  
Thermal Enhancement ◽  
Turbulent Airflow ◽  
Fluent Software ◽  
Flow Turbulence ◽  
Volume Method ◽  
Velocity Turbulence

In presence of baffle, the turbulent airflow phenomena as well as forced convective heat exchange characteristics in two-dimensional rectangular channel have been analyzed in this work. For variations in Reynolds number (Re), we have studied the variations in characteristics of thermal behavior due to the change in the shape of baffle. Computations have been done using finite volume method (FVM) and FLUENT software and the SIMPLE algorithm has been employed for solving the governing equations. Finally, the flow and thermal exchange characteristics viz., streamline flow, turbulence intensity (TE), axial velocity, turbulence kinetic energy (TKE), normalized friction factor (F), normalized average Nusselt number (Nuavg) and thermal enhancement factor (TEF) have been studied in details from numerical standpoint. It has been found that the triangular shaped baffle provides highest value of F at Re = 30,000 and at Re = 46, 000, the maximum value of the TEF is found for the same baffle implying that triangular shaped baffle is more suitable for overall purposes.

scholarly journals Numerical Study on Coupled Operation of Stratified Air Distribution System and Natural Ventilation under Multi-Variable Factors in Large Space Buildings

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8130
Author(s):  
Ziwen Dong ◽  
Liting Zhang ◽  
Yongwen Yang ◽  
Qifen Li ◽  
Hao Huang
Keyword(s):  
Thermal Comfort ◽  
Working Conditions ◽  
Distribution System ◽  
Distribution Systems ◽  
Natural Ventilation ◽  
Numerical Study ◽  
Air Distribution ◽  
Large Space ◽  
Air Conditioners ◽  
Air Supply

Stratified air distribution systems are commonly used in large space buildings. The research on the airflow organization of stratified air conditioners is deficient in terms of the analysis of multivariable factors. Moreover, studies on the coupled operation of stratified air conditioners and natural ventilation are few. In this paper, taking a Shanghai Airport Terminal departure hall for the study, air distribution and thermal comfort of the cross-section at a height of 1.6 m are simulated and compared under different working conditions, and the effect of natural ventilation coupling operation is studied. The results show that the air distribution is the most uniform and the thermal comfort is the best (predicted mean vote is 0.428, predicted percentage of dissatisfaction is 15.2%) when the working conditions are 5.9% air supply speed, 11 °C cooling temperature difference and 0° air supply angle. With the coupled operation of natural ventilation, the thermal comfort can be improved from Grade II to Grade I.

scholarly journals Numerical study of the air distribution in the Crew Quarters on board of the International Space Station

2019 ◽  
Vol 85 ◽  
pp. 02015 ◽  
Author(s):  
Charles Berville ◽  
Matei-Răzvan Georgescu ◽  
Ilinca Năstase
Keyword(s):  
Numerical Simulations ◽  
International Space Station ◽  
Numerical Study ◽  
Ventilation System ◽  
Space Station ◽  
Air Distribution ◽  
Thermal Manikin ◽  
Airflow Rate ◽  
International Space ◽  
Airflow Distribution

The current concept of Crew Quarters on board of the International Space Station has several issues according to the crew member’s feedback. Major issues concern noise levels, the accumulation of CO2 and the quality of the air distribution. Our study targets the airflow distribution, to diagnose this issue, we realise a series of numerical simulations (CFD) based on a real scale replica of the Crew Quarters. Simulations were set with a zero-gravity mode and with the theoretical air parameters inside the SSI. The geometry includes a thermal manikin having the neutral posture of a body in the absence of gravity. Numerical simulations were run for the three different air flow rates provided by the current ventilation system. Results have shown that the air distribution inside the Crew Quarter is insufficient for low airflow rates but becomes acceptable for the higher airflow rate, however the higher airflow rate can potentially produce draught discomfort.

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