Bibliografías temáticas / Air ducts Ventilation. Air flow

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Literatura académica sobre el tema "Air ducts Ventilation. Air flow"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Air ducts Ventilation. Air flow"

Huo, Fei Yang, Jia Hui Sun, Wei Li Li y Yi Huang Zhang. "Influence of Large Turbo-Generator Stator Ventilation Ducts Structural Changes on Stator Temperature". Advanced Materials Research 462 (febrero de 2012): 318–26. http://dx.doi.org/10.4028/www.scientific.net/amr.462.318.

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For the complex status of fluid flow in stator radial ventilation ducts of large turbo-generator, the temperature distribution of stator is dramatically affected by the flow status of cooling medium in stator ventilating ducts. In this paper, a new ventilating ducts structure in stator is investigated. According to fixing a wind deflector on the stator teeth adjacent to the ventilation ducts, the fluid flow status of cooling air is changed flowing in stator ventilation ducts. For this reason, the effect of heat transfer in stator is changed. Taking an air-cooled turbo-generator as an example, considering the characteristics of fluid flow and heat transfer in turbo-generator ventilation system, the three-dimensional fluid flow and heat transfer coupling model is established. Using finite volume method, three-dimensional fluid field and temperature field control equations are coupling solved. Based on this, the velocity distribution in ventilating ducts is obtained. Besides that, the velocity distribution is studied with the cooling air flows into radial ventilation ducts at different incident angles. The influences of wind deflector and incident angles on the fluid velocity and temperature distribution are analyzed. Based on that, some useful conclusions are obtained.

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Gaczoł, Tomasz. "Natural balanced ventilation. Simulations part 2". E3S Web of Conferences 49 (2018): 00026. http://dx.doi.org/10.1051/e3sconf/20184900026.

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The paper is devoted to test results of air flow through natural ventilation supply-exhaust ducts in the rooms located on the upper floor of the building that were conducted in ANSYS Fluent software. Three types of solutions were selected for the tests: air inflow into the room through the air intake located at the basement level, air inflow through the window ventilator (although no longer used, this solution can be found in many existing residential buildings) and the natural ventilation system supported with the so-called “solar chimney” that is usually a glass superstructure, located on the roof of the building above the ventilation ducts. All simulations were conducted with an outdoor temperature of +3 degrees C. The indoor temperature is + 20 degrees C, considered to be the minimum thermal comfort level. The simulations concerned such issues as: pressure system inside the room and in the exhaust duct, distribution of air temperatures in the room, vector direction of air flow through supply and exhaust ducts and in the room. Tests conducted using a computer method of air flow analysis in ducts and in the analysed room indicate that the developed natural balanced ventilation system is a good solution, especially when building sealing is so common. In all cases presented, it meets the normative regulations and requirements for the ventilation air stream and the air exchange rate in the room. The paper (second part) describes test results concerning the room located on the upper floor of the building, i.e. with a long 9-meter long supply duct and a short 3-meter long exhaust duct.

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Gaczoł, Tomasz. "Living quarters. A natural balanced ventilation system. Simulations part 1". E3S Web of Conferences 49 (2018): 00025. http://dx.doi.org/10.1051/e3sconf/20184900025.

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In the following article the author proposes the solution for a properly functioning natural ventilation system based on the use of supply and exhaust ducts, i.e. by designing a natural balanced ventilation system. The paper is devoted to test results of air flow through natural ventilation supply-exhaust ducts in the rooms located on the lower floor of the building. The simulations conducted in ANSYS Fluent software relate to such issues as: pressure system inside the room and in the exhaust duct, distribution of air temperatures in the room, vector direction of airflow through supplyexhaust ducts and in the analysed room. Three types of solutions were selected for the tests: air inflow into the room through the air intake located at the basement level, air inflow through the window ventilator (although no longer used, this solution can be found in many existing residential buildings) and the natural ventilation system supported with the so-called “solar chimney”. All simulations were conducted with an outdoor temperature of +3 degrees C. The indoor temperature is + 20 degrees C, considered to be the minimum thermal comfort level. In the era of common building sealing, the presented ventilation system may be a good solution that guarantees proper functioning of natural ventilation. In all cases presented, it meets the normative regulations and requirements for the ventilation air stream and the air exchange rate in the room. The paper (first part) describes test results concerning the room located on the lower floor of the building, i.e. with a short supply duct and a 12-meter long exhaust duct.

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Li, Yong, Weili Li y Ying Su. "Sensitivity of Axial Velocity at the Air Gap Entrance to Flow Rate Distribution at Stator Radial Ventilation Ducts of Air-Cooled Turbo-Generator with Single-Channel Ventilation". Energies 12, n.º 18 (6 de septiembre de 2019): 3442. http://dx.doi.org/10.3390/en12183442.

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In the design and calculation of a 330 MW water-water-air cooling turbo-generator, it was found that the flow direction of the fluid in the local stator radial ventilation duct is opposite to the design direction. In order to study what physical quantities are associated with the formation of this unusual fluid flow phenomenon, in this paper, a 100 MW air-cooled turbo-generator with the same ventilation structure as the abovementioned models is selected as the research object. The distribution law and pressure of the fluid in the stator radial ventilation duct and axial flow velocity at the air gap entrance are obtained by the test method. After the calculation method is proved correct by experimental results, this calculation method is used to calculate the flow velocity distribution of the outlets of multiple radial ventilation ducts at various flow velocities at air gap inlets. The relationship between the flow distribution law of the stator ventilation ducts and the inlet velocity of the air gap is studied. The phenomenon of backflow of fluid in the radial ventilation duct of the stator is found, and then the influence of backflow on the temperature distribution of stator core and winding is studied. It is found that the flow phenomenon can cause local overheating of the stator core.

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Lu, Yi Ping, Qing Hui Pan, Hui Lan Li y Jia De Han. "Experimental Study of Flow Field of Large Air-Cooled Turbine Generator for Multi-Ventilation Ducts of Stator". Applied Mechanics and Materials 644-650 (septiembre de 2014): 377–80. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.377.

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To study rotational air flow field of rotor and complicated flow distinction owing to multi-ventilation ducts of stator in a large air-cooled turbine generator, considering axial symmetry of air supply, an experiment setup of ventilation system of semi-machine configuration was built in this paper. At condition of rotating, ventilation is measured by hot-wire anemometer. Firstly, ventilation in 16 different semi-circle radius is got. Measurement shows that ventilation in different radius varies much. Then ventilation of outlet of stator ducts is measured. The result shows that ventilation which is affected by flow back and jet less is higher. The conclusion will provide theoretical references for ventilation cooling of rotor ducts in large air-cooled turbine generators.

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Gaj, Patryk y Joanna Kopania. "Influence of Geometry of Channel on the Flow Noise Parameters". Mechanics and Mechanical Engineering 22, n.º 2 (24 de agosto de 2020): 541–52. http://dx.doi.org/10.2478/mme-2018-0043.

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AbstractAcoustic emission through duct walls is an important problem in engineering acoustics. This phenomenon most commonly occurs in heating, ventilating and air-conditioning (HVAC) and other gas flow ducting (large industrial silencers). Many works focus on elaboration of more exact description of the acoustic field phenomena reflecting the real conditions in which these appliances operate. As a standard, circle or rectangular ducts are used in ventilation systems. However, technical conditions during the installation of the HVAC system, due to the limitation of the assembly space, require often the use of channels with other geometries. This paper presents aeroacoustical parameters of three most common cross-sectional shapes of air-moving ductwork. The rectangular, square with roundedcorners and circular ducts were studied. The “natural” duct attenuation, which is a consequence of duct shape or noise breakout and involves a diminution of the internally propagated sound power was observed. Natural duct attenuation can be a useful way of reducing sound power levels in long runs of duct.

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Gherghe, Ion, Doru Cioclea, Florin Rădoi, Adrian Matei y Răzvan Drăgoescu. "Notions regarding the design of suction systems for industrial ventilation". MATEC Web of Conferences 342 (2021): 02006. http://dx.doi.org/10.1051/matecconf/202134202006.

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Air flow in ducts is one of the basic processes of ventilation and air conditioning. Knowledge of this phenomenon and the laws according to it is indispensable for drawing up the sizing calculations of the duct networks, for determining the energy needed to move the air as well as for determining the aerodynamic parameters related to the ventilation ducts. Industrial buildings include large spaces with various sources of releases of harmful substances. Type of these sources and their location depends on the technological process in each section or room.The main role of industrial ventilation systems is to provide a continuous source of fresh air supply from the outside, to keep the temperature and humidity at comfortable levels, to maintain an adequate supply of oxygen in the work area, to control concentrations of hazardous explosive and / or toxic gases in the air and at work, to remove unwanted odors from a particular area and to remove and dilute airborne contaminants. The paper presents the design of exhaust systems, the calculation of suction ventilation systems and the choice of ducts with higher aerodynamic parameters in the choice of fans, using nomograms.

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Sulin, A. B., A. A. Nikitin, T. V. Ryabova, S. S. Muraveinikov y I. N. Sankina. "Energy-efficient outdoor air flow control in ventilation systems". Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering 5, n.º 2 (2021): 18–24. http://dx.doi.org/10.25206/2588-0373-2021-5-2-18-24.

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A method for controlling the ventilation system flow characteristics is considered based on the forming principle an air temperature and carbon dioxide concentration predicted estimate in a room based on the changes dynamics analysis in these parameters in the supply and exhaust ducts. The expected microclimate parameters predicted assessment in real time opens up the possibility of using such elements and algorithms for controlling the ventilation and air conditioning system, which provide the required air quality with minimal energy consumption. The analysis calculates the finding probability the measured parameter inside or outside the control zone after a specified time interval. The algorithm for the control system actuators actuation for the channels of temperature and carbon dioxide concentration is presented in the block diagram form. The decision-making logic for actuating the actuators is based on the changes direction and intensity analysis in temperature and carbon dioxide concentration in the exhaust duct and the temperature difference between the supply and exhaust

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Renz, Andreas, Julian Praß, Johannes Weber y Stefan Becker. "Experimental Investigation of a Friction Ventilator". Advanced Engineering Forum 19 (octubre de 2016): 43–49. http://dx.doi.org/10.4028/www.scientific.net/aef.19.43.

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Standard decentralized ventilation systems typically consist of two ventilators for inlet and exhaust air and a heat exchanger for the heat recovery. A recently developed device, a so called friction ventilator, combines these three elements into a single functional element. The ventilator consists of circular plates which are rotating centrally in between the inlet and the outlet duct of a ventilation system and generate a countercurrent flow in the two ducts. Furthermore, the discs act as a rotating heat exchanger between the two air flows. To increase understanding of the energy transfer from the rotating discs to the flow an experimental investigation on the effect of different rotor geometries was conducted. The study showed an interesting influence of the hub diameter on the characteristic curves with a higher pressure difference for an increase in diameter. The results of the heat recovery measurement however were only mildly affected by the hub geometry. Here the distance between the discs, the rotational speed of the discs and the volumetric flow seemed to have the greatest effect on heat recovery.

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El Moueddeb, K., S. Barrington y N. Barthakur. "Perforated Ventilation Ducts: Part 1, A Model for Air Flow Distribution". Journal of Agricultural Engineering Research 68, n.º 1 (septiembre de 1997): 21–27. http://dx.doi.org/10.1006/jaer.1997.0176.

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Tesis sobre el tema "Air ducts Ventilation. Air flow"

MacKinnon, Ian R. (Ian Roderick) 1964. "Air distribution from ventilation ducts". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59655.

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A wooden, perforated, uniform cross-section duct was examined to determine the optimum levels of aperture ratio and fan speed with respect to uniformity of discharge. The optimum aperture ratio for the 8.54 m long duct was 1.0 with a uniformity coefficient of 90.28%. The fan speed had little effect on the uniformity of discharge. The friction factor was experimentally determined to be 0.048 for a non-perforated duct and this value was assumed to be the same for a perforated duct of similar construction. A kinetic energy correction factor was used to analyze the flow in the duct. Values for this correction factor were determined from experimental data. Values of the coefficient of discharge and the total duct energy were calculated. A mathematical model was proposed based on the conservation of momentum and the Bernoulli's equation. The model responded favourably and predicted the duct velocity nearly perfectly and slightly underestimated the total duct energy.

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Kinsman, Roger Gordon. "Outlet discharge coefficients of ventilation ducts". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59271.

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Discharge coefficients are an important parameter in the prediction of the air displacement performance of ventilation outlets and in the design of ventilation ducts.
Discharge coefficients of a wooden ventilation duct 8.54 metres in length and of a constant 0.17 m$ sp2$ cross sectional area were measured. Four different outlet shapes and 3 aperture ratios of each shape were tested. A split plot experimental design was used to evaluate the effect of outlet shape, outlet size, and distance from the fan on discharge coefficient. The relationship between duct performance characteristics and discharge coefficient was examined. A mathematical equation to predict the discharge coefficient was developed and tested.
Discharge coefficient values measured ranged from 0.19 to 1.25 depending on the aperture ratio and distance from the fan. Outlet shape had no significant effect. The apparent effects of aperture ratio and size are due to the effects of head ratio. The equation predicting the discharge coefficient had a maximum error of 5 percent for the aperture ratios of 0.5 and 1.0, and 15 percent at an aperture ratio of 1.5.

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Balasubramanian, Vivek. "Effectiveness of the "common" method in balancing exhaust ventilation systems". Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4354.

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Thesis (M.S.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains vii, 59 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 48-49).

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El, Moueddeb Khaled. "Principles of energy and momentum conservation to analyze and model air flow for perforated ventilation ducts". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=42024.

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A theoretical model was developed to predict the air distribution pattern and thus to design perforated ventilation ducts equipped with a fan. The analysis of the air distribution pattern of such systems requires accurate measurement procedures. Several experimental methods were tested and compared. Accordingly, the piezometric flush taps and thermo-anemometer were selected to measure respectively the duct air pressure and the outlet air flow.
Based on the equations of energy and momentum conservation, a model was formulated to predict the air flow performance of perforated ventilation ducts and to evaluate the outlet discharge angle and the duct regain coefficients without evaluating frictional losses. The basic assumptions of the model were validated by experimentally proving the equivalence of the friction losses expressed in the 2 cited equations. When compared to experimental results measured from four wooden perforated ventilation ducts with aperture ratios of 0.5, 1.0, 1.5, and 2.0, the model predicted the outlet air flow along the full length of perforated duct operated under turbulent flow conditions with a maximum error of 9%. The regain coefficient and the energy correction factor were equal to one, and the value of the discharge coefficient remained constant at 0.65, along the full length of the perforated duct. The outlet air jet discharge angle varied along the entire duct length, and was not influenced by friction losses for turbulent flow.
Assuming a common effective outlet area, the model was extended to match the performance of the fan and the perforated duct and to determine their balance operating point.

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Fu, Yan. "Modelling of ducted ventilation system in agricultural structures". Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60519.

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Air distribution ducts are used in the environmental control of livestock and poultry building as well as the conditioning of most agricultural produce.
In order to simplify the approach to the design of ventilation ducts, a mathematical equation has been derived to describe the average air velocity of a duct.
The primary objective of the research work was to test goodness of fit of an equation describing the average air velocity of perforated ventilation ducts, under balanced as well as unbalanced air distribution: $V = H sb{o}{X over L} + (V sb{L}-H sb{o}) {X sp2 over L sp2}$.
This equation was successfully tested using data measured from 14 ducts of constant cross-sectional area, built of wood or polyethylene with outlets of various shapes and aperture ratios. Results indicated that aperture ratio and distance along the duct are the two most significant factors influencing the average duct air velocity values, but material and outlet shape had little effect.

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El, Moueddeb Khaled. "Principles of energy and momentum conservation to analyze and model air flow for perforated ventilation ducts". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ29929.pdf.

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Khaire, Swapnil S. "Influence of test section entrance conditions on straight flat oval apparent relative roughness a thesis presented to the faculty of the Graduate School, Tennessee Technological University /". Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=2000385011&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1277822700&clientId=28564.

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Besarla, Dhaman Kumar. "Modeling and optimization of air flow in a cabin air filtration test duct a thesis presented to the faculty of the Graduate School, Tennessee Technological University /". Click to access online, 2008. http://proquest.umi.com/pqdweb?index=0&did=1679682361&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1254155722&clientId=28564.

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Sanchez, Marc. "Etude des extracteurs d'air hybrides éoliens : conception de géométries et analyse des écoulements". Thesis, Perpignan, 2015. http://www.theses.fr/2015PERP0040/document.

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Ce travail de thèse concerne l'étude d'extracteurs d'air hybrides éoliens. Il se décompose en des investigations amont et appliquées. Dans la partie amont, des simulations fines ont été effectuées en conduite carrée avec et sans rotation, pour des nombres de Reynolds turbulents de l'ordre de 600, afin d'analyser l'impact de la rotation sur la turbulence. Elles ont montré que la rotation rompt la symétrie de l'écoulement. La partie appliquée est dédiée à la conception d'une nouvelle géométrie d'extracteur d'air. Cette géométrie a été proposée à partir de l'analyse de simulations RANS. Ses performances ont été confirmées par des mesures expérimentales sur banc d'essais. Les tests en soufflerie d'un système de captage d'énergie éolienne, conçu pour l'extracteur, ont mis en évidence son adéquation au régime de fonctionnement de l'extracteur. Les essais expérimentaux de l'extracteur complet, montrent que le système de captage apporte une part significative de l'énergie. Des essais en soufflerie ont permis d'observer le comportement global de l'extracteur
This PhD work concerns the study of hybrid air extractors. It is composed of upstream and applied investigations. In the upstream part, fine simulations are realized in square duct flow with and without rotation to analyse the impact of rotation on turbulence. It is found that rotation removes symmetry property of the flow with turbulent Reynolds number of 600. The applied part is dedicated to the conception of a new air extractor geometry. This geometry is proposed from the analyse of RANS simulations. Its performances are confirmed by experimental measurements on test rig. Wind tunnel tests of a wind power capturing system, designed for the extractor, show a good adequation to the operating regime of the extractor. Experimental investigations on the complete air extractor, show the wind power capturing system brings a significant part of the energy. Wind tunnel tests allow to observe the complete air extractor behaviour

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Trinder, M. C. J. "Active noise control in finite length ducts". Thesis, University of Essex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371924.

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Libros sobre el tema "Air ducts Ventilation. Air flow"

Lynn, Wray H., ed. Airflow in ducts. Hayward, CA: LAMA Books, 1996.

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Gladstone, John. Moving air through fans and ducts. Coral Gables, FL: Engineer's Press, 1992.

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Haskell, Ted. Improved air distribution systems for forced-air heating. [Portland, OR]: Bonneville Power Administration, 1995.

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Wallis, R. Allan. Axial flow fans and ducts. Malabar, Fla: Krieger Pub. Co., 1993.

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International, ORTECH. Study of residential ventilation duct energy losses. Ottawa, Ont: Efficiency and Alternative Energy Technology Branch/CANMET, Energy, Mines and Resources Canada, 1992.

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International, ORTECH. Study of residential ventilation duct energy losses. Ottawa, Ont: Energy Efficiency Division, Energy Technology Branch/CANMET, 1993.

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Etheridge, David. Building ventilation: Theory and measurement. Chichester: John Wiley & Sons, 1996.

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Perzak, F. J. Fire tests of rigid plastic ventilation ducts. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1987.

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L, Felker Travis, ed. Dampers and airflow control. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, 2009.

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Finkelstein, Hal. Variable air volume system operation: A guide to engineering design and operations. Washington, DC: National Resource Center, 1998.

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Capítulos de libros sobre el tema "Air ducts Ventilation. Air flow"

Akiyama, M., H. Sugiyama, N. Ninomiya y A. Leoni-Schmid. "Numerical Analysis and Visualization of Air Ventilation Systems". En Flow Visualization VI, 463–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_80.

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Yildirim, Kemal-Edip, Matthias Finkenrath, Mehmet Gökoglu y Frank Seidel. "Monitoring the Fresh-Air Flow Rate for Energy-Efficient Bus Ventilation". En Energy and Thermal Management, Air Conditioning, Waste Heat Recovery, 147–56. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47196-9_12.

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Sofu, Tanju, Fon-Chieh Chang, Ron Dupree, Srinivas Malipeddi, Sudhindra Uppuluri y Steven Shapiro. "Measurement and Analysis of Underhood Ventilation Air Flow and Temperatures for an Off-Road Machine". En The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains, 373–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-44419-0_34.

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Crooke, P. S., A. M. Kaynar y J. R. Hotchkiss. "A Mathematical Model of Air-Flow Induced Regional Over-Distention during Mechanical Ventilation: Comparing Pressure-Controlled and Volume-Controlled Modes". En Advances in the Theory of Control, Signals and Systems with Physical Modeling, 269–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16135-3_22.

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"ventilation air flow". En Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1480. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_220329.

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Cory, WTW (Bill). "Air and gas flow". En Fans and Ventilation, 43–75. Elsevier, 2005. http://dx.doi.org/10.1016/b978-008044626-4/50005-x.

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Thakur, Pramod. "Air Flow in Mine Airways". En Advanced Mine Ventilation, 17–34. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-08-100457-9.00002-x.

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"Aerodynamics of Dust Airflows in the Spectra of Air Exhaust Ducts". En Local Exhaust Ventilation, 1–8. CRC Press, 2015. http://dx.doi.org/10.1201/b18488-2.

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"Aerodynamic Properties of Particles in the Gravitational Flow of a Chuted Bulk Material". En Industrial Air Quality and Ventilation, 49–90. CRC Press, 2014. http://dx.doi.org/10.1201/b16549-4.

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"Appendix 9: Fume and dust control, air ventilation hose and ducts". En Humidification and Ventilation Management in Textile Industry, 424–30. Elsevier, 2009. http://dx.doi.org/10.1533/9780857092847.424.

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Actas de conferencias sobre el tema "Air ducts Ventilation. Air flow"

Toriyama, H. y Y. Asako. "Effect of a Permanent Magnet on CHS (Compost Heating System)". En ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12350.

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Effect of a permanent magnet on ventilation of an air duct through compost have been investigated numerically. Some compost yield heat over 60 Celsius in fermentation process. That exothermic reaction produces a considerable amount of heat, which could be a potential heating source. Fermentation reaction requires ventilation, abundant supply of paramagnetic oxygen gas and exhaust of metabolized diamagnetic carbon dioxide gas. Continuous and forced air supply is more efficient rather than the conventional manual turn or stirring as ventilation means. In magneto-fluid-dynamics, the magnetizing force acting on a paramagnetic oxygen gas is applied for the enhancement of air flow, heat and mass transfer. In this research, the enhancement of the air flow of various size air ducts have been numerically investigated by applying a permanent magnet on an air duct. Numerical results shows that a permanent magnet enhances the air flow. The application of a permanent magnet to an air duct is useful for CHS, a promising alternative energy system.

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Scanlon, T., P. Wilson, G. Priestman y J. Tippetts. "Development of a Novel Flow Control Device for Limiting the Efflux of Air Through a Failed Pipe". En ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59662.

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The secondary air-systems of a gas turbine engine frequently incorporate pipes and ducts to transport air for duties such as cooling and sealing of the turbine components, pressurisation of the aircraft cabin and component de-icing. The engine must be capable of operating safely in the event of failure of a pipe or duct. The ducts typically pass through the low pressure ventilation zones outboard of the core engine and failure will result in a large mass flow of relatively high temperature air escaping from the secondary air system; the design of the engine must accommodate this potential escape so that no component is over-pressurised or over-heated as a result. A novel device is presented that will limit the flow that escapes in the event of a pipe failure. This device has been developed from a number of flow elements from Fluidic technology applications. It has no moving parts and is thus suitable for use as a high-reliability failure protection device. The device consists of a Coanda diverter that can switch the flow through a vortex throttle so that the device has high and low resistance states. The diverter is conditioned to default to the low resistance state unless a control flow extracted from the device exceeds a critical value whereupon it will switch the device to a high resistance state. The level of the control flow is determined by the pressure ratio acting across the device. This is achieved by contrasting the flow characteristics of a metering orifice that determines the control flow with that of a diffuser fitted to the device outlet. The device has been shown to half the flow that escapes from a failed duct compared with an unrestricted duct of the same flow capacity. Experimental and numerical results are presented that show that the device is effective at the high pressure ratios pertaining to gas turbine operation. With suitable modification the device could be adapted to fulfill a number of other functions within a secondary air-system that require variation of flow resistance in response to a change in pressure ratio combined with the high reliability and robustness of a no-moving-parts device.

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Alizadeh, Sohail y Barrie Moss. "Modelling Sub-Grid Scale Features in Congested Engine Ventilation Zones". En ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90461.

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In the increasingly congested accessory zones of gas turbine engine casings, it is important that the several temperature-sensitive components, like the electronic engine control unit (EEC), are bathed in an appropriate ventilation environment. Additionally it must be ensured that heat sources, like the geometrically complex gear box components, furthest from the inflows do not sit in stagnant zones. In this paper CFD methods have been used to study in detail the ventilation and heat transfer environment of one particular zone — that of the fan casing in the engine nacelle of a high by-pass turbofan. A particular challenge was the appropriate modelling of the extensive pipe systems that existed in this environment, ensuring that their impact on the flow field and heat transfer was suitably taken into account. Whilst in past practice large components and ducts have been modelled in CFD studies, the small scale pipe systems and electrical harnesses do not lend themselves easily to explicit modelling strategies. In this work a methodology is presented whereby the effects of all small scale pipe systems within the zone are represented using a sub-grid modelling approach. The momentum drag and heat release associated with all small scale pipes have been modelled and their impact on the ventilation and heat transfer characteristics of the accessory zone environment assessed. Comparisons made with the explicit methodology, not employing sub-grid models, have revealed that the small scale pipe systems have a significant impact on the flow and heat distribution, particularly around the EEC. Finally, limited comparisons with similar test rig flow visualisation data have been made, confirming the overall flow pattern within the zone. The work also suggests approaches in which the sub-grid methodology may be extended and verified for engine design purposes.

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Parayil, Paulson, Somnath Sen, Anit Sen y Arunkumar Goel. "Iterative Study to Improve Air Flow Distribution on Ventilation Unit Duct Using CFD Analysis". En Thermal Management Systems Conference 2020. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0030.

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Maqsood, Asim y A. M. Birk. "Effect of a Bend on the Performance of an Oblong Ejector". En ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27851.

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This paper presents the results of an experimental study on the performance of oblong ejectors with a bend in the mixing tube. In the aerospace industry, space limitations can lead to the design of exhaust ducts of oblong cross section. These ducts can also include ejectors for engine space ventilation or exhaust cooling or infrared signature suppression. In some cases these systems require bends after the primary driving nozzle. Each ejector consisted of a nozzle and a constant area mixing tube. A series of bent mixing tubes with the same radius of curvature was tested and the results were compared with the baseline straight ejector. A hot flow wind tunnel was used to provide the primary air flow at temperatures up to 450°C and mass flow rates up to 2 kg/s. Ambient air from the surroundings was allowed to enter the mixing tubes and mix with the primary air issuing from the primary nozzle. Velocity, pressure and temperature measurements were taken upstream of the nozzle, at the mixing tube inlet and at the exit of the mixing tube. Seven-hole probes were used to resolve the velocity vector at the exit of the mixing tube to identify large-scale flow structures. Mass flow ratio, temperature distribution and the losses in the different ejectors were compared to estimate the degradation of ejector performance with the degree of bend. Significant reduction in the performance was observed with the degree of bend in the ejector.

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Nakielska, Magdalena y Krzysztof Pawłowski. "Enhancement of Gravity Ventilation in Buildings". En Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.269.

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Nowadays, people are looking for solutions related to ventilation, cooling or heat demand systems, which would be energy efficient and, at the same time, would not cause the degradation of the surrounding environment. As far as ventilation is concerned, an good solution is a natural ventilation, which improves thermal comfort rooms without increasing the consumption of electrical energy in the building. In order to improve the mode of action of the natural ventilation in the building, one can mount various elements supporting the air flow. One of them is a solar chimney. In order to check the correct operation of a gravity ventilation installation in Poland’s climatic conditions, the measurements was carried out on a test stand on the 3.1 building of UTP University of Science and Technology in Bydgoszcz. The received results show the intensification of the air flow through the room the value between 50% and 150%, depending on a measuring hour (Chen et al. 2003). These research results were compared with the research results received before the installation of the solar chimney on the ducts of the gravity ventilation.

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Chen, Qi y A. M. Birk. "Experimental Study of an Exhaust Ejector With Entraining Diffuser". En ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68654.

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Air-air ejectors are used in a wide range of industrial applications. In gas turbine installations, ejectors are typically used for entraining ventilation air or cooling of exhaust ducting. In some gas turbine applications, the exhaust system must be cooled to limit temperatures inside the structure or to manage heat signatures. The ducts are usually cooled by ejectors with film or effusion cooled diffusers. Entraining diffusers typically have poor pressure recovery and as a result, the ejector performance is affected. This paper presents experimental results on the performance of an air-air ejector with an entraining diffuser. The effects of inlet swirl, and primary nozzle area ratio on the diffuser pressure recovery and ejector pumping were studied. The ejector experiments were carried out on a cold flow wind tunnel that can provide primary air flow rates up to 2.2 kg/s at ambient temperature. Velocity, pressure and temperature measurements were taken in the annulus upstream of the primary nozzle, at the nozzle exit, at the diffuser inlet, on the diffuser walls, and at the diffuser exit. The results show that swirl strongly improves flow non-uniformity at the diffuser exit. The peak pumping performance and the strongest diffuser gap flows was observed with 20° of swirl in the primary nozzle flow. At the no swirl condition, the nozzle area ratio slightly affected the overall entrainment ratio. However, the large nozzle area ratio resulted in the best pumping when swirl was applied.

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Fumizawa, Motoo y Hidenori Horiuchi. "Helium-Air Exchange Flow Rate Measurement Through a Small Opening". En ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37008.

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Buoyancy-driven counter flows of helium-air were investigated through horizontal and inclined small openings. Counter flows may occur following a window opening as ventilation, fire in the room as well as a pipe rupture accident in a high temperature gas-cooled nuclear reactor [1]. The counter flows also occur following the fusion reactor accident of LOVA that takes place through the breaches of vacuum vessel penetration duct [2]. The experiment has carried out by a test chamber filled with helium and flow was visualized by the smoke wire method. The flow behavior has recorded by a high-speed camera with a computer system. The image of the flow was transferred to the digital data, thus the flow velocity was measured by PTV software. The mass fraction in the test chamber was measured by electronic balance. The detected data was arranged by the densimetric Floude number of the counter flow rate that derived from the dimensional analysis. The method of mass increment was developed and applied to measure the counter flow rate. By removing the cover plate placed on the top of the opening, the counter flow initiated. Air enters the test chamber and the mass of the gas mixture in the test chamber increased. The volumetric counter flow rate was evaluated from the mass increment data. In the case of inclination openings, the results of both methods were compared. The inclination angle for maximum densimetric Floude number decreased with increasing length-to-diameter ratio of the opening. For a horizontal opening, the results from the method of mass increment agreed with those obtained by other authors for a water-brine system.

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Hassan, Nik Normunira Mat, A. M. Leman, Muhammad Alif Mohamed Noor Zafarullah, Zuliazura Salleh, K. A. Rahman, Rais Hanizam Madon, S. Muzarpar y A. R. Shayfull Zamree. "Characterization of flow rate and heat loss in heating, ventilation and air conditioning (HVAC) duct system for office building". En PROCEEDINGS OF GREEN DESIGN AND MANUFACTURE 2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0044697.

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Neale, J., S. S. Leong, T. Barber, K. Byrne y E. Leonardi. "Noise Treatment Strategies for High Velocity HVAC Ducts in Ocean Going Fast Ferries". En ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61403.

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This paper describes a study of strategies used to limit the flow generated noise encountered in the outlet diffusers of high velocity heating, ventilation and air conditioning (HVAC) duct systems. A circular jet of air was expanded using a 7° conical diffuser with a variety of outlet configurations and pipe lengths. Sound pressures were recorded for a jet diameter of 50 mm and a jet velocity of 15–60 ms−1 using a dual room reverberation suite. The design of the diffuser outlet was found to have a pronounced effect on the noise spectrum radiating from the duct outlet. The length and shape of the outlet duct downstream from the diffuser directly affect the noise radiating from it. Results are presented for a variety of outlet pipe lengths and geometric configurations. A numerical simulation of airflow through the conical diffuser was also completed using a large eddy simulation (LES) turbulence model for a range of jet velocities. An acoustic post processor was then used to predict the corresponding far-field sound pressure and sound power levels.

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Informes sobre el tema "Air ducts Ventilation. Air flow"

Goolsby, G. K. Position paper -- Tank ventilation system design air flow rates. Office of Scientific and Technical Information (OSTI), enero de 1995. http://dx.doi.org/10.2172/10117825.

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