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Journal articles on the topic 'Air ducts Ventilation. Air flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Huo, Fei Yang, Jia Hui Sun, Wei Li Li, and Yi Huang Zhang. "Influence of Large Turbo-Generator Stator Ventilation Ducts Structural Changes on Stator Temperature." Advanced Materials Research 462 (February 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,

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2

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 th

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3

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

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4

Li, Yong, Weili Li, and 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, no. 18 (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 ai

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Lu, Yi Ping, Qing Hui Pan, Hui Lan Li, and 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 (September 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 whic

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6

Gaj, Patryk, and Joanna Kopania. "Influence of Geometry of Channel on the Flow Noise Parameters." Mechanics and Mechanical Engineering 22, no. 2 (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

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Gherghe, Ion, Doru Cioclea, Florin Rădoi, Adrian Matei, and 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 s

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8

Sulin, A. B., A. A. Nikitin, T. V. Ryabova, S. S. Muraveinikov, and I. N. Sankina. "Energy-efficient outdoor air flow control in ventilation systems." Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering 5, no. 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 probabilit

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9

Renz, Andreas, Julian Praß, Johannes Weber, and Stefan Becker. "Experimental Investigation of a Friction Ventilator." Advanced Engineering Forum 19 (October 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 fr

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10

El Moueddeb, K., S. Barrington, and N. Barthakur. "Perforated Ventilation Ducts: Part 1, A Model for Air Flow Distribution." Journal of Agricultural Engineering Research 68, no. 1 (1997): 21–27. http://dx.doi.org/10.1006/jaer.1997.0176.

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11

Tsakanian, Oleh S., and Serhii V. Koshel. "Integral Thermo-Anemometers for Average Temperature and Airflow Measurement in Ducts, at Anemostat Outlets and in Ventilation Grilles." Journal of Mechanical Engineering 23, no. 4 (2020): 14–21. http://dx.doi.org/10.15407/pmach2020.04.014.

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When creating ventilation systems, it is important to correctly calculate the volumes of air inflow and outflow. If an error is made in the calculation or a redistribution of air flows is required, measurements are indispensable. The existing methods for determining the air flow rate by using point measurements in the cross-section are laborious and time-consuming, and taking readings at different time points introduces a significant error into the result. A. M. Pidhornyi Institute of Mechanical Engineering Problems of the National Academy of Sciences of Ukraine has developed a new hot-wire an

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Zhang, Qun Feng, Jin Li Yan, Min Wang, and Zhi Xiang Chen. "CFD Application on Ventilation System of Hydro-Generator." Advanced Materials Research 383-390 (November 2011): 3561–65. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3561.

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Averaged 3D N-S equations and RNG k-ε equations were solved with parallel computing CFD code on the flow field of dual radial ventilation system without fan for a hydro-generator. The MRF(multiple implicit rotating frame) method was used to simulated the rotating motion of the generator and porous media model were used to simulate the pressure loss of air cooler. Rational tactics were selected to generate calculation grids to compromise with calculation CPU time and result accuracy and the grids of different parts were generated with ICEM-CFD. The flow characteristic of different parts was ana

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Peszyński, Kazimierz. "Building a bridge between industry and theory on the example of a new ventilation system." EPJ Web of Conferences 213 (2019): 01001. http://dx.doi.org/10.1051/epjconf/201921301001.

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The paper presents the possibilities of simplified determination of the air volumetric flow rate in ventilation ducts. This problem occurred during the tests of local losses in the elements of a new ventilation system based on ducts with a rounded rectangular cross-section. The presented method requires mathematical modelling of the flow velocity distribution in the ducts. The paper presents four models of the velocity distribution. The necessity of using so many models resulted from the wide coverage of the tested sections: Amax/Amin= 46.88.

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Peszynski, Kazimierz, Jan Novosád, Emil Smyk, Lukasz Olszewski, and Petra Dančová. "Modelling of air flow rate in significantly flattened rounded rectangular ventilation ducts." EPJ Web of Conferences 180 (2018): 02082. http://dx.doi.org/10.1051/epjconf/201818002082.

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Paper presents new mathematical model for air flow velocity distribution in rounded rectangular ducts and its experimental verification. In papers [1, 2] an mathematical model based on modified Prandtl equation for power power-law velocity profile was determined. It works very well for smaller cross sections. During the study of larger cross sections new phenomena in flowing air have been observed, it forced the search for a new model. The new model is based on a rounded rectangular division into two parts: slot and rounded square.

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15

Абдразаков, Ф., Fyarid Abdrazakov, А. Поваров, and Andrey Povarov. "RESEARCH EFFICIENCY OF NATURAL VENTILATION SYSTEM OF APARTMENT BUILDING." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 4, no. 7 (2019): 49–56. http://dx.doi.org/10.34031/article_5d35d0b78284d1.97759530.

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The analysis of existing research in the field of ventilation systems is performed and the current shortcomings of the ventilation systems of secondary apartment houses of series 114–85 are identified. The instability of the natural ventilation system of an apartment building characterized by variable air exchange and overturning ventilation in the ventilation ducts is demonstrated. Field studies of the natural ventilation system efficiency of an apartment house series 114–85 located in Saratov are carried out. According to the research results, the absence of traction and the presence of reve

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Peszynski, Kazimierz, Jan Novosád, Emil Smyk, Lukasz Olszewski, and Petra Dančová. "Modelling of air flow rate in significantly flattened rounded rectangular ventilation ducts." EPJ Web of Conferences 180 (2018): 02082. http://dx.doi.org/10.1051/epjconf/201817002082.

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17

Oldham, D. J., Jian Kang, and M. W. Brocklesby. "Modelling the Acoustical and Airflow Performance of Simple Lined Ventilation Apertures." Building Acoustics 12, no. 4 (2005): 277–92. http://dx.doi.org/10.1260/135101005775219139.

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The pressure differences that can be used to drive a natural ventilation system are very small and thus large apertures are required to allow sufficient air to enter and leave a building to ensure good air quality or thermal comfort. Large apertures are potential acoustic weak points on a façade and may require some form of acoustic treatment such as absorbent linings, in which case the ventilator is similar to a short section of lined duct. In ducts, the performance of absorbent linings increases with the length of lining and the ratio of the length of lined perimeter to the cross sectional a

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18

Ju, Fa-Li, Liying Liu, and Xiaoping Yu. "An analytical study to evaluate the impact of distributed zone fans on the air flow rate in a mechanical ventilation system." Building Services Engineering Research and Technology 41, no. 4 (2019): 507–16. http://dx.doi.org/10.1177/0143624419873761.

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Based on air flow rate testing of each branch fan in a distributed fan ventilation system under different branch air duct inlet static pressures, the conclusion can be drawn that there is a branch fan air flow rate deviation phenomenon. The air flow rate of the branch fan increases with the branch air duct inlet static pressure at the same branch fan speed, and the branch fan hinders the air flow rate in some cases. In this study, a theoretical expression of the deviation of the branch air duct design air flow rate was established, and the influencing factors of the deviation were determined t

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19

Xing, Xia Qiong, Xin Fei Zhao, Zhang Qin, and Xiao Hong Zhou. "Numerical Simulation the Airflow Field in the Flame Retardant Cloth Ducts." Advanced Materials Research 796 (September 2013): 643–48. http://dx.doi.org/10.4028/www.scientific.net/amr.796.643.

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Fiber air dispersion system (FADS) is a new flexible ventilation terminal in ventilated areas. It can be used in both air transmission and air diffusion. The cloth duct made of flame retardant polyester is critical. The conditioned air can be dispersed to environment by not only micro pores in the fabric but also slot and orifice on the fabric. The micro-pores in the fabric exist in the yarns and fibers. The laser can be used to cut the slot and orifice on the fabric. They can be designed based on the application. In this paper, air dispersion models and basic characteristics of fiber air disp

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20

Li, Xiao Feng, and Qing Li. "Study on the Flow Numerical Simulation of Jet Ventilation in Multi Tunnel Excavation." Advanced Materials Research 524-527 (May 2012): 731–34. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.731.

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Pressed ventilation in heading face is actually turbulent jet ventilation. In the blind drift, the air ducts are usually laid on one side of the drifting tunnel forming the wall-attached jet along the side of the tunnel and in order to dilute and pour out harmful gas and dust, and create an backflow at the same time, the airflow of the ventilation jet must reach at the head of the tunnel. Therefore, the forced ventilation in heading face is actually restrained wall attached jet ventilation in confined space.

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21

Gol'tsov, A. B., K. I. Logachev, O. A. Averkova, V. A. Tkachenko, and I. V. Khodakov. "The investigation of the air flow distribution swirling by the rotating suction cylinder." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 6 (July 26, 2018): 56–60. http://dx.doi.org/10.17073/1683-4518-2018-6-56-60.

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The improvement of the local exhaust ventilation consists in the emission and pollution agents' concentration at the electrical power minimum expenses. The using of the rotating exhaust cylinder in the aspiration hoods can result in the reduction of both the dust loss into the aspiration system and the dust aerosol transportation costs in the air transfer ducts. We investigated the air flow velocity distribution near the rotating exhaust cylinder depending on the rotation frequency and vented air consumption. The obtained results can be applied when the local closed exhaust hoods designing, th

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22

Oz, S., S. Fogel, V. Dubovsky, G. Ziskind, and R. Letan. "Solar-Assisted Induced Ventilation of Small Field Structures." Journal of Solar Energy Engineering 126, no. 2 (2004): 781–88. http://dx.doi.org/10.1115/1.1669029.

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Induced passive ventilation was studied in a small field structure, about 60cm×30cm×85cm in size, heated by solar irradiation. The structure has three stories, connected by a vertical duct, which in turn is connected to a horizontal duct above the upper level of the structure. The outer walls of these two ducts are metal sheets painted on the outside with black matte paint and covered by glass sheets. The other outer walls and inner partitions of the structure are made of cardboard attached to a metal frame. Additional elements included in some experiments were a water tank, used for heat stor

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Osipov, S. N., S. L. Danilevskiy, and A. V. Zacharenko. "THE USE OF AIR LAYERS IN BUILDING ENVELOPES FOR ENERGY SAVING DURING AIR CONDITIONING." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 60, no. 5 (2017): 470–83. http://dx.doi.org/10.21122/1029-7448-2017-60-5-470-483.

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Since there are no large natural energy resources in Belarus, energy savings ought to be a point of the special attention. With this regard it is important to develop modern ways of savings during the process of air conditioning inside new buildings with an air layer in the enclosure, especially in translucent ones. The system of ventilation of air layers in the enclosure of a building has been introduced in which air movement is caused by the gravitational and aerodynamic forces. It makes it possible to arrange further ventilation – a natural, forced or a hybrid one. With the purpose of incre

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Korbut, V., V. Mileikovskyi, V. Dziubenko, and I. Sachenko. "The use of the interaction of convex wall jets for ventilation with variable air flow." Ventilation, Illumination and Heat Gas Supply 37 (April 1, 2021): 7–12. http://dx.doi.org/10.32347/2409-2606.2021.37.7-12.

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The most energy efficient ventilation and air-conditioning is variable air flow (VAV) depending on the needs of a room. To avoid broken air circulation by gravitational forces, the most of air diffusers should change geometrical shape and sizes using additionall automation of them. In contrast, high stability of a scheme of air exchange organization with air supply over a working zone by convex wall jets that interact with each other under conditions of variable air flow, is confirmed. This scheme is useful in cases where it is impossible to supply air directly to the working zone. Simulation

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Przydrozny, Edward, and Aleksandra Przydrozna. "Temperature and airflow setting in dual-duct ventilation systems." E3S Web of Conferences 116 (2019): 00063. http://dx.doi.org/10.1051/e3sconf/201911600063.

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Past experiences of excess energy consumption and malfunctioning controls introduced prejudice when considering dual-duct ventilation systems during design stages. Modern technologies, however, can be used to improve performance and control of dual-duct systems, thus making these a sensible and safe design option. In the paper, we discuss challenges associated with setting the warm and cold supply air temperatures and how these set-points affect the airflows. We present limitations in temperature settings, due to instantaneous room thermal conditions and the individual design temperature requi

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Waddington, D. C., and D. J. Oldham. "Noise Generation in Ventilation Systems by the Interaction of Airflow with Duct Discontinuities: Part 1 Bends." Building Acoustics 14, no. 3 (2007): 179–202. http://dx.doi.org/10.1260/135101007781998956.

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Discontinuities in air duct systems give rise to turbulence and some of this turbulence results in airflow generated noise. One potential source of flow generated noise in ducts is the presence of a bend. Various strategies are employed to reduce turbulence by smoothing the flow around a bend, such as the use of turning vanes, large radius of curvature and the associated use of splitters, and these will also affect the noise generated. Recent work on the prediction of airflow generated noise in ducts based upon pressure loss characteristics is applied to a range of bends including mitred bends

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Szelka, Michał, Mariusz Woszczyński, Jerzy Jagoda, and Paweł Kamiński. "Wireless Leak Detection System as a Way to Reduce Electricity Consumption in Ventilation Ducts." Energies 14, no. 13 (2021): 3774. http://dx.doi.org/10.3390/en14133774.

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This article presents a proposal for a wireless diagnostic system for checking the air tightness of the ventilation network. The solution is designed to increase crew safety in underground mining plants and increase the energy efficiency of the ventube ventilation system. The system is based on sensors measuring the pressure inside the ventilation duct in relation to the barometric pressure in the immediate vicinity of the duct. The flow of diagnostic data is based on a cascade transfer. The data from the first sensor are transferred successively to the last one. Based on the prior calibration

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Ala-Kotila, Paula, Terttu Vainio, and Jarmo Laamanen. "The Influence of Building Renovations on Indoor Comfort—A Field Test in an Apartment Building." Energies 13, no. 18 (2020): 4958. http://dx.doi.org/10.3390/en13184958.

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This article presents a field test of how deep renovation affects indoor climate quality. The studied apartment building was built in 1968 and is located in Finland, within the Nordic climate zone. The deep renovation included façade repair with extra insulation, new windows with trickle vents, new balcony glass and doors, and the installation of an exhaust air heat pump into the existing mechanical exhaust air ventilation. The indoor climate conditions and building envelope tightness were measured before and after the renovation. As a result of these energy renovation measures, the building e

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Park, Jongmyung, Youngdo Jo, and Gyesoon Park. "Flow characteristics of fresh air discharged from a ventilation duct for mine ventilation." Journal of Mechanical Science and Technology 32, no. 3 (2018): 1187–94. http://dx.doi.org/10.1007/s12206-018-0222-9.

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Ju, Fa-Li, Qinrong Sun, Changlei Hou, Xue Huang, Xiaoping Yu, and Liying Liu. "Test and analysis of air flow rate adaptive performance in a distributed fan ventilation system." Building Services Engineering Research and Technology 42, no. 2 (2021): 223–36. http://dx.doi.org/10.1177/0143624420986000.

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In this study, adaptive branch fan performance in a distributed fan ventilation system was tested. The results demonstrate that the adaptive branch fan stabilises the branch air flow rate within a certain air pressure range corresponding to the branch duct inlet, and this range becomes increasingly narrow as the fan control signal is adjusted to reduce the speed of the fan. The adaptive branch fan is less affected by the main fan and other branch fans in the distributed fan ventilation system because it has a good self-adaptive ability of ventilation duct resistance characteristics and anti-in

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Nan, Chun Zi, Ji Ming Ma, and Luo Zhao. "Numerical Simulation of Impacts of Different Types of Air Duct Outlets on Ventilation Efficiency." Applied Mechanics and Materials 438-439 (October 2013): 1098–103. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.1098.

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To enhance the exhaust efficiency during ventilation, three types of air duct outlets were imported. According to the characteristics of velocity distribution simulated by numerical method, the flow field is divided into the mixing zone and the exhaust zone. The gradual contracted air duct outlet can enhance the mixing effect between fresh air and smoke. In the exhaust zone, however, the flow velocity on the upper section of the tunnel is weakened, which is unfavorable for smoke exhaust. Gradual expanded air duct outlet, on the contrary, may weaken the concentration effect of the airflow. The

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Yi, Huiuk, Jongmyung Park, and Min Sik Kim. "Characteristics of mine ventilation air flow using both blowing and exhaust ducts at the mining face." Journal of Mechanical Science and Technology 34, no. 3 (2020): 1167–74. http://dx.doi.org/10.1007/s12206-020-0218-0.

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Millar, Dean, Michelle Levesque, and Stephen Hardcastle. "Leakage and air flow resistance in mine auxiliary ventilation ducts: effects on system performance and cost." Mining Technology 126, no. 1 (2016): 10–21. http://dx.doi.org/10.1080/14749009.2016.1199182.

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Semin, M. A., and L. Yu Levin. "Theoretical research of heat exchange between air flow and shaft lining subject to convective heat transfer." Mining informational and analytical bulletin, no. 6 (May 20, 2020): 151–67. http://dx.doi.org/10.25018/0236-1493-2020-6-0-151-167.

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The heat and mass transfer in a mine shaft under construction is researched theoretically under temperature conditions in the shaft lining lower than the temperature of air flow fed in the shaft via a ventilation duct. The research was aimed to ensure stable airing of mine shafts in the period of construction before cutting a shaft-to-shaft connection with artificial freezing of surrounding rock mass. The multi-parametric numerical modeling of nonstationary aeroand thermo-dynamic parameters in a mine shafts was performed using 3D convective heat transfer model in ANSYS. It is found that convec

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Wu, Kuan, Shiliang Shi, Yijie Shi, and Yong Chen. "CFD-Based Determination of the Optimal Blowing and Suction Air Volume Ratio of Dual-Radial Swirl Shielding Ventilation in a Fully Mechanized Excavation Face." Geofluids 2021 (September 14, 2021): 1–12. http://dx.doi.org/10.1155/2021/5473256.

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Dust is one of the main pollutants in coal mines, which seriously affects the physical and mental health of workers, as well as the safe production in underground mines. Dual-radial swirl shielding ventilation is a new ventilation method for a fully mechanized excavation face and can effectively reduce the dust concentration in the underground. The dust control effect of dual-radial swirl shielding ventilation is mainly affected by the thickness and integrity of the shielding air curtain, as well as the disturbance of the flow field near the air curtain. By changing the blowing and suction air

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Yaropud, Vitalii, and Yelchin Aliyev. "RESULTS OF INSPECTION OF THE STATE OF PROVIDING THE MICROCLIMATE IN THE PIG FARM WITH A NEGATIVE PRESSURE VENTILATION SYSTEM." ENGINEERING, ENERGY, TRANSPORT AIC, no. 2(113) (June 29, 2021): 168–77. http://dx.doi.org/10.37128/2520-6168-2021-2-17.

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The most popular microclimate system today is based on a negative pressure ventilation system. Because it is easier to use and consumes less energy than any other forced ventilation system. The purpose of the research is to inspect the room for keeping piglets on rearing with a negative pressure ventilation system to identify shortcomings and deviations of the microclimate parameters necessary for further improvement. According to the results of the inspection of the rearing room for piglets, it was found that according to the existing system of negative pressure in the rearing room for piglet

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Krauter, Paula, and Arthur Biermann. "Reaerosolization of Fluidized Spores in Ventilation Systems." Applied and Environmental Microbiology 73, no. 7 (2007): 2165–72. http://dx.doi.org/10.1128/aem.02289-06.

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ABSTRACT This project examined dry, fluidized spore reaerosolization in a heating, ventilating, and air conditioning duct system. Experiments using spores of Bacillus atrophaeus, a nonpathogenic surrogate for Bacillus anthracis, were conducted to delineate the extent of spore reaerosolization behavior under normal indoor airflow conditions. Short-term (five air-volume exchanges), long-term (up to 21,000 air-volume exchanges), and cycled (on-off) reaerosolization tests were conducted using two common duct materials. Spores were released into the test apparatus in turbulent airflow (Reynolds num

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Kumar, Dileep, Abdul Ghafoor Memon, Rizwan Ahmed Memon, Intizar Ali, and Natasa Nord. "Parametric study of condensation at heating, ventilation, and air-conditioning duct's external surface." Building Services Engineering Research and Technology 39, no. 3 (2017): 328–42. http://dx.doi.org/10.1177/0143624417743119.

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The compression of insulation causes around a heating, ventilation, and air-conditioning duct usually resulted in dew formation around the outer surfaces because of low temperature, which causes significant energy and financial losses. The parameters such as supply air flow rate, supply air temperature, ambient air speed, and the convective heat transfer coefficient (ho) plays significant role in dew formation. In this paper, the parametric study is performed to investigate the effects of these parameters on the external surface temperature of the duct to avoid condensation. A mathematical mod

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Rymarov, A., та V. Agafonova. "Персонализированная приточная система вентиляции в помещении офисного здания". Vodosnabzhenie i sanitarnaia tehnika, № 11 (15 листопада 2019): 60–64. http://dx.doi.org/10.35776/mnp.2019.11.08.

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Улучшение качества воздуха в рабочей зоне офисных помещений является актуальной задачей. Конструктивная особенность таких помещений заключается в небольшой высоте (порядка 3 м), что затрудняет подачу необходимого объема приточного воздуха, не создавая сквозняков в рабочей зоне. Отмечено, что решение данного вопроса связано с использованием на практике новых материалов и технологий. К их числу относятся текстильные воздуховоды из 100процентного полиэстера с вплетением карбонового волокна. Данный материал обладает прочностью, износостойкостью, минимальным уносом частиц с поверхности. В отличие о

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Chen, Fu-Jiang, Qin-Yu Wu, Dan-Dan Huang, Yun Zhang, Wang Lu, and Meng-Meng Chen. "Validation of the free area method for modelling fabric air dispersion system without orifices in computational fluid dynamics simulation." Indoor and Built Environment 27, no. 7 (2017): 969–82. http://dx.doi.org/10.1177/1420326x17698532.

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The fabric air dispersion system (FADS) is a ventilation terminal made of special polymer fabric. The porous structure of the fabric causes complex flow motion. Due to its advantages over the conventional ventilation system, i.e. ducts and diffusers, the FADS has been widely favoured by architects and researchers. In computational fluid dynamics (CFD) simulation the FADS is usually simplified into a free opening with an area equal to all pores and perforations, called the free area (FA) method in this present work. However, the effectiveness of this simplified method has not been validated. Th

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Jeon, Shinyoung, Changmin Son, Jangsik Yang, Sunghoon Ha, and Kyeha Hwang. "Full Surface Heat Transfer Characteristics of Stator Ventilation Duct of a Turbine Generator." Energies 13, no. 16 (2020): 4137. http://dx.doi.org/10.3390/en13164137.

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Turbine generators operate with complex cooling systems due to the challenge in controlling the peak temperature of the stator bar caused by Ohm loss, which is unavoidable. Therefore, it is important to characterize and quantify the thermal performance of the cooling system. The focus of the present research is to investigate the heat transfer and pressure loss characteristics of a typical cooling system, the so-called stator ventilation duct. A real scale model was built at its operating conditions for the present study. The direction of cooling air was varied to consider its operation condit

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Wang, Weiliang, Junfu Lyu, Hai Zhang, Qing Liu, Guangxi Yue, and Weidou Ni. "Utilization of the lateral accelerated cross-wind to improve the cooling performance of a natural draft dry cooling tower." Thermal Science 23, Suppl. 4 (2019): 1013–24. http://dx.doi.org/10.2298/tsci19s4013w.

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Cross-wind degrades the performance of a natural draft dry cooling tower (NDDCT). Based on the basic affecting mechanism, this paper introduces a wind collecting approach. By using a wind collecting duct, the lateral flow acceleration of cross-wind is broken up, and the lateral flow kinetic energy is utilized to increase the lateral and rearward static pressure outside the radiator inlet. By adoption of a CFD model, the effect of the wind collecting approach is investigated comprehensively. It is found that the wind collecting ducts could improve the pressure distribution around the radiator b

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Yao, Xingbo, Shuo Han, and Bart Julien Dewancker. "Study on the Combined Effect of Multiple Passive Energy-Saving Methods for Rural Houses with Cold Alleys." Applied Sciences 11, no. 12 (2021): 5636. http://dx.doi.org/10.3390/app11125636.

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China’s rural houses are mostly courtyard-style independent houses. Such houses have certain characteristics, e.g., small mutual influences between houses, strong transformation flexibility, and an easier approach to using the natural environment to develop passive energy-saving characteristics. Therefore, rural houses have large energy-saving potential. In this study, for the first time, the cold alleys between buildings were used as an energy source for passive cooling and ventilation. Traditional houses in Shuhe, China, were used as a case study. The cold alleys in the settlements were used

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Shi, Ling, Hong Mei Chen, Xin Ming Yu, Wei Zhong Yang, and Jin Can Deng. "Experimental Study of the Tunnel Thermal Environment Adjustment." Advanced Materials Research 485 (February 2012): 169–72. http://dx.doi.org/10.4028/www.scientific.net/amr.485.169.

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Abstract. The purpose of the paper is study the tunnel air environment adjustment. We built a set-up according to the similarity law. Temperature, air flow velocity, and the humidity in the model tunnel were measured using a measurement system. Experimental data were obtained under the ventilation duct at the top of the tunnel. The results show that adjusting velocity and humidity of the supply air flow can satisfy the Safety Regulation for Metal and No-metal Mines.

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Czetany, Laszlo, and Peter Lang. "Impact of Inlet Boundary Conditions on the Fluid Distribution of Supply Duct." Applied Mechanics and Materials 861 (December 2016): 384–91. http://dx.doi.org/10.4028/www.scientific.net/amm.861.384.

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Ventilation is important to maintain the indoor air quality and other comfort parameters in the occupied zone. The design of ventilation systems is based on one dimensional approach. When the air distribution is modelled in the ventilated space usually CFD simulation is performed and simplified boundary conditions are defined at the locations where the supply air enters the room. However, in some cases it is difficult to predict the duct flow by 1D methods. The flow in the duct system determines the outflow at the air terminal devices. The interaction between the multiple system elements is im

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Lackowski, Marcin, Andrzej Krupa, and Anatol Jaworek. "Nanofabric nonwoven mat for filtration smoke and nanoparticles." Polish Journal of Chemical Technology 15, no. 2 (2013): 48–52. http://dx.doi.org/10.2478/pjct-2013-0023.

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The process of production of filtration mats of various thickness from PVC and PVDF polymers by the electrospinning method is presented in the paper. Filtration of nanoparticles and submicron particles is an important problem in industry and health protection systems, in particular in air-conditioning and ventilation appliances. This problem can be effectively solved by application of non-woven fibrous filtration mats. The experimental investigations of mechanical properties of nanofibrous filtration mats produced by electrospinning and the measurements of removal efficiency of submicron parti

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Filkin, N. M., and A. M. Tatarkin. "NUMERICAL RESEARCH OF THE MOISTURE CONDENSATION ELIMINATION IN THE CABIN OF THE UNIFIED TECHNOLOGICAL ELECTRIC TRANSPORT VEHICLE." Vestnik SibADI 15, no. 4 (2018): 538–46. http://dx.doi.org/10.26518/2071-7296-2018-4-538-546.

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Introduction. This article deals with the problem of moisture condensation inside the cabin of the technological electric transport vehicle. The hypothesis of using the forced air ventilation in the cabin is substantiated, by which such problem could be solved.Materials and methods. The article describes the application of the ANSYS Fluent Software Package to assess the effect of the location and shape of the ducts on the ventilation process inside the cabin. Accordingly, the key stages of air flow modeling in this program are considered.Results. The main content of the research is to analyze

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Aureliano, Filipe dos Santos, Alessandro Ferreira Alves, Rodrigo Franklin Frogeri, Wanderson Gomes de Souza, Simone de Paula Teodoro Moreira, and Laísa Cristina Carvalho. "Eulerian Video Magnification for Cleaning and Inspection of Air Conditioning Ducts With Rover Robot." International Journal for Innovation Education and Research 8, no. 3 (2020): 38–47. http://dx.doi.org/10.31686/ijier.vol8.iss3.2176.

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This paper presents a diversied artifice of a Rover robot prototype in order to inspect abnormalities in air conditioning ducts and ventilation through an integrated rotating high-resolution camera system Eulerian Video Magnification is a method capable of revealing temporal variations of a body in videos that are impossible to see with the naked eye. Using this method, it is possible to visualize the flow of microorganisms present in the ducts, in which the images are R.W. transmitted in real time to the operator, allowing the cleaning with rotating brushes that adapt themselves according to

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Chezganova, Evgenia, Olga Efimova, Vera Sakharova, et al. "Ventilation-Associated Particulate Matter Is a Potential Reservoir of Multidrug-Resistant Organisms in Health Facilities." Life 11, no. 7 (2021): 639. http://dx.doi.org/10.3390/life11070639.

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Most healthcare-associated infections (HCAIs) develop due to the colonisation of patients and healthcare workers by multidrug-resistant organisms (MDRO). Here, we investigated whether the particulate matter from the ventilation systems (Vent-PM) of health facilities can harbour MDRO and other microbes, thereby acting as a potential reservoir of HCAIs. Dust samples collected in the ventilation grilles and adjacent air ducts underwent a detailed analysis of physicochemical properties and biodiversity. All Vent-PM samples included ultrafine PM capable of reaching the alveoli. Strikingly, >70%

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Hastings, R. H., and F. L. Powell. "High-frequency ventilation of ducks and geese." Journal of Applied Physiology 63, no. 1 (1987): 413–17. http://dx.doi.org/10.1152/jappl.1987.63.1.413.

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We studied gas exchange in anesthetized ducks and geese artificially ventilated at normal tidal volumes (VT) and respiratory frequencies (fR) with a Harvard respirator (control ventilation, CV) or at low VT-high fR using an oscillating pump across a bias flow with mean airway opening pressure regulated at 0 cmH2O (high-frequency ventilation, HFV). VT was normalized to anatomic plus instrument dead space (VT/VD) for analysis. Arterial PCO2 was maintained at or below CV levels by HFV with VT/VD less than 0.5 and fR = 9 and 12 s-1 but not at fR = 6 s-1. For 0.4 less than or equal to VT/VD less th

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