scholarly journals Generalized Predictive Controller Design for Compressed Air Distribution

2019 ◽  
Vol 8 (9) ◽  
pp. 18-22
Keyword(s):  
Distribution System ◽  
Associate Degree ◽  
Gas Flow ◽  
Controller Design ◽  
Compressed Air ◽  
Air Distribution ◽  
Unidirectional Flow ◽  
Electrical Analogy ◽  
Area Unit ◽  
World Organization

Compressed air distribution system is a major source of industrial power as it is safe, reduces cost of labour and easily transmitted. A well designed system should transport compressed air from the point of production to the point of application. However certain factors like type of compressor, air quality, layout and flow rate are major attributes to a well-designed system. Air ducts area unit the foremost vital elements of such reasonably systems, they outline the most important dynamic characteristics. The unidirectional flow is sometimes assumed once modelling the gas flow through associate degree duct. The work utilization of the electrical analogy methodology by change of integrity opposition with the hypothetically determined models of capacitance and inductance that prompts loads of first-request customary differential conditions for transient investigation of equal gas streams in pipeline network. Understanding the projected order standard equation is actually loads a lot of simple than world organization ravelling the arrangement of incomplete differential conditions. The process focal points of this strategy are shown by different them and therefore the ancient techniques once connected to a scope of pipe network simulation.

Energy Efficiency Improvement of Diesel Aftertreatment With Flow Reversal and Central Fuelling

2007 ◽  
Author(s):  
Ming Zheng ◽  
Siddhartha Banerjee ◽  
Xiaohong Xu ◽  
Usman Asad ◽  
Xiaoye Han ◽  
...  
Keyword(s):  
Gas Flow ◽  
Flow Reversal ◽  
Regeneration Rate ◽  
Exhaust Temperature ◽  
Energy Efficiency Improvement ◽  
Unidirectional Flow ◽  
Central Heating ◽  
Fuel Delivery ◽  
Delivery Technique ◽  
Substrate Properties

Empirical and theoretical studies are made between the inlet and central heating schemes in a flow reversal embedment of diesel aftertreatment converters in order to investigate the influences of gas flow, heat transfer, chemical reaction, oxygen concentration, and substrate properties. The periodic flow reversal converter is found effective to treat engine exhausts that are difficult to cope with conventional unidirectional flow converters. However, the previous work indicates that the exhaust temperature from modern diesel engines is commonly insufficient to sustain a high conversion or regeneration rate and thus supplemental heating techniques are commonly applied. A technique of fuelling at the central region of a flow-reversal embedment is found more energy-efficient to raise the temperature of the catalytic flow-bed and therefore to drastically reduce the supplemental heating to the substrate. An effective fuel delivery technique has been tested to improve the fuel dispersion of the central fuel delivery strategy at various engine-out exhaust temperatures, compositions, and flow rates.

scholarly journals A CFD analysis of room aspect ratio on the effect of buoyancy and room air flow

2007 ◽  
Vol 11 (4) ◽  
pp. 79-94 ◽  
Author(s):  
Brajesh Tripathi ◽  
Moulic Sandipan ◽  
Late Arora
Keyword(s):  
Temperature Distribution ◽  
Distribution System ◽  
Air Distribution ◽  
Cooling Load ◽  
Cfd Analysis ◽  
Uniform Temperature ◽  
Air Volume ◽  
Recent Developments ◽  
Careful Design ◽  
Occupied Zone

Comfort conditions in air-conditioned rooms require that temperature in the occupied zone should not vary by more than 1?C and velocity, every where in the room, should be less than 0.15 m/s so that occupants do not feel draft. Recent developments in providing effective insulation and making leak tight buildings are considerably reduced the cooling load requirements and the supply airflow rates. Obtaining uniform temperature distribution with reduced air volume flow rates requires careful design of air distribution system. This study aims to find velocity and temperature distribution in the room towards this end.

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 Experimental Study on Indoor Thermal Stratification in Large Space by under Floor Air Distribution System (UFAD) in Summer

Engineering ◽  
2011 ◽  
Vol 03 (04) ◽  
pp. 384-388 ◽  
Author(s):  
Xin Wang ◽  
Chen Huang ◽  
Weiwu Cao ◽  
Xuelei Gao ◽  
Wen Liu
Keyword(s):  
Experimental Study ◽  
Distribution System ◽  
Thermal Stratification ◽  
Air Distribution ◽  
Large Space

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.

scholarly journals Gas System for the ATLAS NSW Micromegas Detectors: Design Aspects and Advanced Validation Methods for their QA/QC

2019 ◽  
Vol 24 ◽  
pp. 23 ◽  
Author(s):  
T. Alexopoulos ◽  
E. Gazis ◽  
S. Maltezos ◽  
A. Antoniou ◽  
V. Gika ◽  
...  
Keyword(s):  
Distribution System ◽  
Gas Flow ◽  
Test Methods ◽  
Gas Leak ◽  
Gas System ◽  
Medical Needles ◽  
Flow Pressure ◽  
Loss Method ◽  
Lock In ◽  
Rate Loss

In this work we present the design aspects of the Gas Distribution System of NSW Micromegas detectors, simulation results and gas flow / pressure uniformity. We also describe the appropriate gas leak test methods, a conventional and an alternative one, being used in the Quality Assurance and Quality Control of the detectors. For the performance studies we used emulated leak branches based on medical needles. We also describe proposed upgrade stages combining the proposed competitive Flow Rate Loss method with the Lock-in Amplifier technique. Further, we describe the baseline setup for the Gas Tightness Station at BB5/CERN.

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