Numerical Simulation and Optimization of Air Distribution in Large Space

2014 ◽  
Vol 1070-1072 ◽  
pp. 2021-2026
Author(s):  
Ze Hang Du ◽  
Chun Hua Liu ◽  
Guang Zhou
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Large Space ◽  
Air Conditioning System ◽  
Simulation And Optimization ◽  
Air Inlet ◽  
Air Supply ◽  
Dimensional Distribution ◽  
Air Speed

In recent years, people pay increasing attention to the issue whether indoor air conditioning system can meet the requirements of thermal comfort under the circumstance of good air quality and reduce energy consumption. FLUENT, commercial computational fluid dynamics software is used to simulate the three-dimensional distribution of temperature and velocity in the subject hotel atrium. The turbulence model modified by buoyancy was used to solve equations. The SIMPLE scheme was used for numerical discrimination. Distribution of temperature, velocity on some typical section and the atrium space can be obtained; the result of numerical simulation can be visualized by post-processing module of FLUENT and TECPLOT software. The influence to the air flow distribution is simulated and calculated by the elements of different rates, angle, and height of the air supply flow. As for the specified case of the project, an optimized solution is obtained, that is supply air speed 6 m/s, angle 15°, air inlet height 7.5m, air temperature 291K.

Hydraulic Characteristics of the New Type Bulb Turbine With Micro-Head

2013 ◽  
Author(s):  
Lingyu Li ◽  
Yuan Zheng ◽  
Daqing Zhou ◽  
Zihao Mi
Keyword(s):  
Numerical Simulation ◽  
Cfd Simulation ◽  
Guide Vane ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Three Dimensions ◽  
Guide Vanes ◽  
Runner Blade ◽  
Cfd Method ◽  
Bulb Turbine

The head of low-head hydropower stations is generally higher than 2.5m in the world, while micro-head hydropower resources which head is less than 2.5m are also very rich. In the paper, three-dimensional CFD method has been used to simulate flow passage of the micro-head bulb turbine. The design head and unit flow of the turbine was 1m and 3m3/s respectively. With the numerical simulation, the bulb turbine is researched by analyzing external characteristics of the bulb turbine, flow distribution before the runner, pressure distribution of the runner blade surface, and flow distribution of the outlet conduit under three different schemes. The turbine in second scheme was test by manufactured into a physical model. According to the results of numerical simulation and model test, bulb turbine with no guide vane in second scheme has simpler structure, lower cost, and better flow capacity than first scheme, which has traditional multi-guide vanes. Meanwhile, efficiency of second scheme has just little decrease. The results of three dimensions CFD simulation and test results agree well in second scheme, and higher efficiency is up to 77% which has a wider area with the head of 1m. The curved supports in third scheme are combined guide vanes to the fixed supports based on 2nd scheme. By the water circulations flowing along the curved supports which improve energy transformation ability of the runner, the efficiency of the turbine in third scheme is up to 82.6%. Third scheme, which has simpler structure and best performance, is appropriate for the development and utilization of micro-head hydropower resources in plains and oceans.

scholarly journals Numerical Simulation and Analysis of Air Supply Mode in Luxury Cruise Air-conditioning System

2021 ◽  
Vol 2029 (1) ◽  
pp. 012119
Author(s):  
Shaoshu Zhang ◽  
Haibo Gao ◽  
Zhiguo Lin ◽  
Yunrui Zhao ◽  
Yunhua Guo ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Air Conditioning ◽  
Air Conditioning System ◽  
Air Supply ◽  
Supply Mode

Simulation and Optimization on Outlet Velocity of Industrial Plant Air Supply Cylinder

2013 ◽  
Vol 732-733 ◽  
pp. 552-557
Author(s):  
Guang Xiao Kou ◽  
Hang Qing Wang ◽  
Bo Feng ◽  
Liang Liang Hu
Keyword(s):  
Wind Speed ◽  
Internal Structure ◽  
Three Dimensional ◽  
Simulation Method ◽  
Small Hole ◽  
Industrial Plant ◽  
Three Dimensional Flow ◽  
Simulation And Optimization ◽  
Air Supply ◽  
Outlet Hole

By using numerical simulation method,the three-dimensional flow field of air supply cylinder using for displacement ventilation in industrial plant is analyzed. The internal structure, effective wind sent area and the shape of wind outlet small hole which affected the air outlet wind speed of air supply cylinder are researched. While compared with the simulated and measured result of the outlet velocity of the wind outlet small hole, the best feature parameters of wind speed in air supply cylinder has been gained. The result shows that: by changing the internal structure and decreasing the effective air supply area of the air supply cylinder, the wind speed from the air-outlet on the small hole can be more reasonably distributed; although by increasing the effective air supply area and changing the shape of outlet hole on air supply cylinder will make the air outlet be more effectively distributed, its value is unreasonable.

Numerical Simulation and Optimization Practice of Oxygen Lance for Converter Steelmaking

2011 ◽  
Vol 402 ◽  
pp. 156-159
Author(s):  
Yong Chen ◽  
Xin Teng Liang ◽  
Jian Hua Zeng ◽  
Jun Chen ◽  
Rong Di Liu
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Necessary Condition ◽  
Converter Steelmaking ◽  
Oxygen Lance ◽  
Sulfur Distribution ◽  
Fundamental Parameters ◽  
Simulation And Optimization ◽  
Average Formation ◽  
Sulfur Distribution Ratio

The lance system is one of the important link of converter. Stable and secure of the system is a necessary condition for whole production system to function normally. The numerical simulation for a three-dimensional oxygen lance nozzle was carried out according to the fundamental parameters of PZH steel, the characteristics of the oxygen jet were analyzed and discussed. The oxygen lance nozzle with the optimum design has achieved good results in practice: the average formation time of early slag was reduced by 1 min and 23 seconds, the pure blowing time was reduced by 46 seconds, the oxygen consumption per ton steel decreased by 1.05 m3/t, the rate of dephosphorization was increased by 1.35%, the basicity of slag was reduced by 0.38, the phosphorus and sulfur distribution ratio between slag and liquid iron were also increased effectively.

Indoor Thermal Environment Research of Air Conditioning Office with Air from Window Gap

2013 ◽  
Vol 860-863 ◽  
pp. 1660-1665
Author(s):  
Ze Hua Liu ◽  
Yan Liao ◽  
Hao Ping Yu
Keyword(s):  
Numerical Simulation ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Local Area ◽  
Indoor Thermal Environment ◽  
Air Infiltration ◽  
Air Supply ◽  
Field Velocity ◽  
Average Relative Humidity ◽  
Air Speed

The paper presents a numerical simulation study of indoor thermal environment of an air conditioning office in winter in Hengyang. Considering the effect of air infiltration from window gap, the distribution of indoor temperature field, velocity field and humidity field can be obtained when air supply angle is 45° down to the horizontal direction. Compared with simulation which air infiltration is ignored, the results show that average temperature of air conditioning area reduces 0.6 °C in Y = 1.1 m section. Air velocity is larger in Y = 1.1 m air conditioning zone. The air speed is greater than 0.2 m/s in local area, a sense blowing. Average relative humidity is larger in Y = 1.1 m air conditioning area. The research indicates that air infiltration can not be allowed to be neglected in numerical simulation.

scholarly journals Numerical Analysis of the Pivot Node in Fracture Problems

2018 ◽  
Vol 774 ◽  
pp. 473-478
Author(s):  
J. Garcia-Manrique ◽  
Daniel Camas ◽  
A. Lima-Rodriguez ◽  
Antonio González-Herrera
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Load Level ◽  
Mode I ◽  
Ansys Software ◽  
Narrow Region ◽  
Factors Influencing ◽  
Experimental Correlation ◽  
Dimensional Distribution ◽  
Main Factors

Recent studies have allowed us to identify a narrow region of the thickness of the crack front in fracture problems that presents interesting characteristics for the numerical-experimental correlation. Taking the three-dimensional distribution of the stress intensity factor (K) as a reference, we observe how it remains invariant and independent of the main factors influencing this type of analysis. This article presents a summary of how to identify this point through the numerical simulation of the problem and its relationship with parameters such as thickness, load level or angle of curvature. The simulations are carried out with the ANSYS software in an aluminium CT specimen subjected to a fracture loading process in mode I.

scholarly journals Numerical simulation and optimization of casting process of copper alloy water-meter shell

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402092345
Author(s):  
Kaikui Zheng ◽  
Youxi Lin ◽  
Weiping Chen ◽  
Lei Liu
Keyword(s):  
Numerical Simulation ◽  
Phase Distribution ◽  
Three Dimensional ◽  
Casting Process ◽  
Element Model ◽  
Casting Defects ◽  
Gating System ◽  
Three Dimensional Model ◽  
Simulation And Optimization ◽  
Water Meter

The water-meter shell has a complex-structured thin-walled cavity, and it can cause casting defects such as shrinkage and misrun. On the basis of structural analysis of a water-meter shell, a three-dimensional model and a finite element model of the water-meter shell were constructed using the SOLIDWORKS and ProCAST software as a modeling tool and a casting numerical simulation tool, respectively. Three processes associated with the bottom gating system without a riser, a step gating system with a preliminary riser, and a step gating system with an optimum riser were successively numerically simulated. The mold-filling sequence, temperature distribution, liquid-phase distribution during solidification, and shrinkage distribution of these three processes are discussed here. The numerical simulation results indicated that optimization of the casting process and the rational assembling of the riser led to the shrinkage volumes at the inlet position, regulating sleeve, and sealing ring of the water-meter shell decreasing from 0.68 to 0 cm3, 1.39 to 0.22 cm3, and 1.32 to 0.23 cm3, respectively. A comparison between model predictions and experimental measurements indicated that the castings produced by the optimized process had good surface quality and beautiful appearance, without casting defects, demonstrating that numerical simulation can be used as an effective tool for improving casting quality.

Application on the Stratified Air Conditioning System with Low Velocity in the Main Hall of the Temple

2011 ◽  
Vol 280 ◽  
pp. 141-146
Author(s):  
Yi Yun Huang ◽  
Ling Zhang ◽  
Xiao Hong Han
Keyword(s):  
Air Conditioning ◽  
Energy Use ◽  
Low Velocity ◽  
Large Space ◽  
Air Conditioning System ◽  
Air Supply ◽  
And Function ◽  
The Cost ◽  
The Buddha ◽  
The Temple

This paper presents a design scheme of the stratified air conditioning system, in accordance with the temple hall’s large space and function characteristics. The indoor stratified air conditioning environment is formed by the low velocity air supply of fan coil units embedded below the Buddha statue. The interface of stratified air is only 1.7m high, because the large amount of air unavoidably penetrates the room due to the prohibition of closing the door. From the tested results, the design not only meet the temple hall’s operational requirements for decoration and the open front door, but also greatly reduces the energy consumption of the air conditioning at the cost of the comfortable feeling of air conditioning. In this work, some suggestions are also given in order to further improve the comfort and lower the energy use.

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