scholarly journals The Characteristics of Air Swirl Supply Device

2012 ◽  
Vol 7 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Orest Voznyak ◽  
Iryna Sukholova ◽  
Khrystyna Myroniuk
Keyword(s):  
Air Flow ◽  
Air Distribution ◽  
Experimental Investigations ◽  
Air Jets ◽  
Air Supply ◽  
Three Factor

Abstract In this article results of experimental investigations of air supply into the room by air distribution device which creates swirl air jets for creation more intensive turbulization air flow in the room are presented. Experimental investigations in order to composed matrix were carried out; graphycal dependences have been obtained as well three-factor chart has been designed. Obtained results of these investigations give possibility to realize engineer calculations of air distribution with swirl air jets.

scholarly journals Modelling of air flow supply in a room at variable regime by using both K - E and spalart – allmaras turbulent model

2017 ◽  
Vol 12 (2) ◽  
pp. 15-22
Author(s):  
Vadim Korbut ◽  
Orest Voznyak ◽  
Iryna Sukholova ◽  
Khrystyna Myroniuk
Keyword(s):  
Air Flow ◽  
Ventilation System ◽  
Air Distribution ◽  
Experimental Investigations ◽  
Human Organism ◽  
Ansys Fluent ◽  
Air Jets ◽  
Air Supply ◽  
Experimental Researches ◽  
Variable Regime

Abstract The abstract is to The article is devoted to the decision of actual task of air distribution efficiency increasing with the help of swirl and spread air jets to provide normative parameters of air in the production apartments. The mathematical model of air supply with swirl and spread air jets in that type of apartments is improved. It is shown that for reachin of air distribution maximal efficiency it is necessary to supply air by air jets, that intensively extinct before entering into a working area. Simulation of air flow performed with the help of CFD FLUENT (Ansys FLUENT). Сalculations of the equation by using one-parameter model of turbulence Spalart-Allmaras are presented. The graphical and the analytical dependences on the basis of the conducted experimental researches, which can be used in subsequent engineering calculations, are shown out. Dynamic parameters of air flow that is created due to swirl and spread air jets at their leakage at variable regime and creation of dynamic microclimate in a room has been determined. Results of experimental investigations of air supply into the room by air distribution device which creates swirl air jets for creation more intensive turbulization air flow in the room are presented. Obtained results of these investigations give possibility to realize engineer calculations of air distribution with swirl air jets. The results of theoretical researches of favourable influence of dynamic microclimate to the man are presented. When using dynamic microclimate, it’s possible to decrease conditioning and ventilation system expenses. Human organism reacts favourably on short lasting deviations from the rationed parameters of air environment.

scholarly journals Modeling of air flow in industrial rooms

2018 ◽  
Vol 13 (1) ◽  
pp. 21-28
Author(s):  
Yuriy Yurkevych ◽  
Iryna Sukholova ◽  
Mariana Kasynets
Keyword(s):  
Air Flow ◽  
Air Distribution ◽  
Experimental Investigations ◽  
Human Organism ◽  
Dynamic Parameters ◽  
Ansys Fluent ◽  
Air Jets ◽  
Air Supply ◽  
The Mathematical Model ◽  
Variable Regime

Abstract The article is devoted to the air distribution in a room by swirl and laying air jets. Dynamic parameters of air flow that is created due to swirl and laying air jets at their leakage in a room has been determined. The mathematical model of air supply with swirl and laying air jets in the industrial rooms is improved. Simulation of air flow is performed due to CFD FLUENT (Ansys FLUENT). Solution of the equation by using k-ε model of turbulence is presented. Dynamic parameters of air flow that is created due to swirl and laying air jets at their leakage at variable regime and creation of dynamic microclimate in a room has been determined. Results of experimental investigations of air supply into the room by air distribution device which creates swirl air jets for creation more intensive turbulence air flow in the room are presented. The results of theoretical researches of influence of dynamic microclimate to the human organism are presented.

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.

Numerical and Experimental Investigations on the Residual Stresses at the Centre of Flat Glass Disks After Thermal Tempering

2008 ◽  
Vol 39-40 ◽  
pp. 553-558 ◽  
Author(s):  
Frédéric Soulié ◽  
Norbert Siedow ◽  
John Anton ◽  
Dominique Lochegnies
Keyword(s):  
Residual Stresses ◽  
Scattered Light ◽  
Flat Glass ◽  
Experimental Investigations ◽  
Stress Profile ◽  
Air Cooling ◽  
Conductive Heat ◽  
Air Jets ◽  
Complete Procedure ◽  
Disk Centre

Flat glass disks are thermally tempered by air-cooling with two air jets at the centre of their surfaces. Numerical modelling and photoelasticity measurements are proposed to analyze the distribution of the residual stresses through the glass thickness at the centre of the tempered disks. For the modelling, glass properties dependent of the temperature are used for the conductive heat transfer. Radiation is modelled by an improved approximation method. By taking both structural and stress relaxations into account, the transient and residual stresses are computed along the disk thickness. For experimentation, a complete procedure is proposed to access to the stress state in the centre of the disks using a scattered light polariscope. The average distribution of the residual stresses is deduced from stress profile measurements taking four radial orientations at the disk centre into consideration. Comparison between numerical and experimental values is finally discussed for the residual surface and half-thickness stresses at the disk centre.

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 Fill ventilation of heated corn grain

2020 ◽  
pp. 74-77
Author(s):  
Mikhail Gennadievich Zagoruyko ◽  
Sergey Anatolyevich Pavlov
Keyword(s):  
Experimental Data ◽  
Distribution System ◽  
Air Flow ◽  
Air Distribution ◽  
The Dead ◽  
Over Time ◽  
Corn Grain

The grain masses of the first and subsequent batches, the equivalent coefficient of the dead gap of the air distribution system are calculated, the expressions for calculating the air flow for these batches and the experimental data on the change in moisture and temperature of the grain over time are given.

Air Flow Modelling of a Multi-Storey Office Building

2013 ◽  
Vol 361-363 ◽  
pp. 833-844
Author(s):  
Chong Jie Wang ◽  
Wei Wei Liu
Keyword(s):  
Temperature Distribution ◽  
Natural Ventilation ◽  
Air Flow ◽  
Comfort Level ◽  
Office Building ◽  
Temperature Stratification ◽  
Air Distribution ◽  
Flow Modelling ◽  
Ventilation Strategies

Indoor fresh air distribution, temperature stratification and temperature distribution are consider to be the essential indicators when comes to evaluation of the comfort level for internal ventilation environment, particularly for natural ventilated space as target office building. It can be identified that the targeting building has been well designed in the respect of natural ventilation strategies where both cross and stack strategies have been adopted, but it is also obvious that under combined buoyancy and wind driven mode alternative problems appears.

Fluid Flow and Heat Transfer Induced by a Window Air Conditioner Unit and Associated Thermal Comfort

2005 ◽  
Author(s):  
Hamza Begdouri ◽  
Luis Rosario ◽  
Muhammad M. Rahman
Keyword(s):  
Thermal Comfort ◽  
Comfort Level ◽  
Cfd Modeling ◽  
Air Distribution ◽  
Air Conditioner ◽  
Surface Areas ◽  
Air Supply ◽  
Office Rooms ◽  
Inlet Angle ◽  
The Impact

This study considers airflow simulations to evaluate the impact of different window air-conditioner locations on the thermal comfort in an office rooms (OR). This paper compares the air distribution for an office room by using computational fluid dynamics (CFD) modeling. The air distribution was modeled for a typical office room window air conditioning unit, air supply from a high pressure on the top and the low pressure exhaust on the bottom considering the existing manufacturing ratios for surface areas. Calculations were done for steady-state conditions including an occupant and a light source. The discharge angle for the supply grill of the AC unit was varied from 20 to 40 degrees. The position of the air conditioner was also varied and studied at 60%, 75% and 90% of the total height of the room. In addition the location of the occupant within the office room was varied. Predictions of the air movement, room temperature, room relative humidity, comfort level, and distribution of contaminants within the office room are shown. Analysis of these simulations is discussed. The positions of the air-conditioner unit, the inlet angle and the occupant position in the office room have shown to have important impacts on air quality and thermal comfort. Results are in good agreement with available experimental data.

scholarly journals Use of Air Infiltration in Swine Housing Ventilation System Design

2019 ◽  
Vol 35 (3) ◽  
pp. 325-338
Author(s):  
H T Jadhav ◽  
S J Hoff
Keyword(s):  
Ventilation System ◽  
Three Dimensional ◽  
Design Procedure ◽  
Field Testing ◽  
Air Distribution ◽  
Air Jets ◽  
Air Infiltration ◽  
Air Jet ◽  
Archimedes Number ◽  
Ventilation Systems

Abstract.The objective of this research was to develop and analyze the procedure for using recent air infiltration (AI) data collected from commercial swine finishing rooms (SFRs) in the design of negative pressure mechanical ventilation systems (VSs). Air infiltration is an integral part of any ventilation process. Infiltration reduces the pressure differential across planned inlets and at very low pressure differences, cold air jets may drop directly on the animals causing significant discomfort. In this article, a design procedure is proposed for swine housing ventilation systems with the influence of air infiltration included. The method was used on one SFR for which air infiltration data was collected by in-field testing. The air-jet throw, jet momentum number, a newly developed coverage factor, and Archimedes number were used to assess the influence of infiltration on predicted air-jet and fresh-air distribution and to help guide the design of planned inlets in SFR VSs with known infiltration. The analysis completed quantifies the severity of AI on air-jet and air distribution performance, and suggests that for the analysis room to ventilate properly requires a 50% reduction in AI levels beyond field measured curtain and fan infiltration. The analysis completed suggests a method for systematically planning three-dimensional ceiling inlet placement and operation and provides design guidance for new ceiling inlets suitable for SFR VSs. Keywords: Air distribution, Air-jets, Archimedes number, Infiltration, Jet Momentum Number.

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