Готові списки джерел за темами / Wind ventilation

Добірка наукової літератури з теми "Wind ventilation"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Wind ventilation"

1

Kim, Yeong Sik, Hanshik Chung, Hyomin Jeong, Sung-Ki Song, Chungseob Yi, and Soon-Ho Choi. "Experimental Study on a Fixed Type Natural Ventilator." International Journal of Air-Conditioning and Refrigeration 24, no. 03 (September 2016): 1650016. http://dx.doi.org/10.1142/s2010132516500164.

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Ventilation is the intentional air supply to a closed space from the outside, which is essential for the sake of a comfortable environment and the health of human beings. In recent, with the wide spread of renewable energy, much attention has been paid to the natural ventilation. The natural ventilator is classified into a fixed type, a venturi type and a wind turbine type. In this study, the ventilation rates of the fixed type ventilator were experimentally investigated by changing the wind velocity. Additionally, the condition of a backflow was also examined. According to the experimental results, the ventilated air flow strongly depended on the outside wind velocity and also on the intake opening area. In the reverse flow test, it was confirmed that the reverse flow into the ventilator occurred if the wind velocity was under a certain threshold value. Furthermore, the reverse flow phenomenon was more severe when an obstacle is located in the downstream of a ventilator.
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2

Yoon, Nari, Mary Ann Piette, Jung Min Han, Wentao Wu, and Ali Malkawi. "Optimization of Window Positions for Wind-Driven Natural Ventilation Performance." Energies 13, no. 10 (May 14, 2020): 2464. http://dx.doi.org/10.3390/en13102464.

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This paper optimizes opening positions on building facades to maximize the natural ventilation’s potential for ventilation and cooling purposes. The paper demonstrates how to apply computational fluid dynamics (CFD) simulation results to architectural design processes, and how the CFD-driven decisions impact ventilation and cooling: (1) background: A CFD helps predict the natural ventilation’s potential, the integration of CFD results into design decision-making has not been actively practiced; (2) methods: Pressure data on building facades were obtained from CFD simulations and mapped into the 3D modeling environment, which were then used to identify optimal positions of two openings of a zone. The effect of the selected opening positions was validated with building energy simulations; (3) results: The cross-comparison study of different window positions based on different geographical locations quantified the impact on natural ventilation effectiveness; and (4) conclusions: The optimized window position was shown to be effective, and some optimal solutions contradicted the typical cross-ventilation strategy.
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3

Wang, Enmao, Xiaoping Li, Qiming Huang, and Gang Wang. "Research on the Influence of Natural Wind Pressure in Deep Mines on Ventilation Stability." Advances in Civil Engineering 2022 (February 27, 2022): 1–12. http://dx.doi.org/10.1155/2022/8789955.

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Deep mines are greatly affected by changes in natural wind pressure because of their large buried depths and long ventilation paths. Changes in natural wind pressure do affect the air flow of the underground ventilation system, and even change the direction of individual branches. If the dynamic changes of natural wind pressure are not monitored constantly, it is very likely to cause disasters such as gas overrun and may even lead to heavy casualties. In this paper, the changes of natural wind pressure and the air volume entering the mine are measured on-site in the 630 mining area in the south wing of Tangkou Coal Mine, Then, compare the change law of natural wind pressure with the change law of ventilation air volume. Finally, through numerical simulation by FLUENT, the change of internal flow in the gob where there is a loosely closed condition is simulated. Through research, the annual natural wind pressure change and the change of air intake in the 630 mining area of the south wing of Tangkou Coal Mine were obtained; The influence of changes in external conditions on the ventilation air volume of deep mines is obtained; The importance of the influence of natural wind pressure on the stability of the deep mine ventilation system is verified.
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4

Karava, Panagiota, Ted Stathopoulos, and Andreas K. Athienitis. "Wind-induced natural ventilation analysis." Solar Energy 81, no. 1 (January 2007): 20–30. http://dx.doi.org/10.1016/j.solener.2006.06.013.

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5

Ai, Z. T., C. M. Mak, J. L. Niu, Z. R. Li, and Q. Zhou. "The Effect of Balconies on Ventilation Performance of Low-rise Buildings." Indoor and Built Environment 20, no. 6 (May 24, 2011): 649–60. http://dx.doi.org/10.1177/1420326x11409457.

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Chand et al. conducted experiments in a low speed wind tunnel to study the effect of balconies on the ventilative force on low-rise buildings without openings. Using their model, this study intends to investigate indoor ventilation performance by examining mass flow rate and average velocity on the working plane using computational fluid dynamics. Simulations were validated against their experiments. The numerical results indicate that, for single-sided ventilation, the provision of balconies increases mass flow rate and reduces average velocity on the working plane in most rooms, but for cross ventilation, this provision has no significant effect under normally or obliquely incident wind conditions. After the addition of balconies, the worst ventilation circumstances on the windward side under single-sided ventilation conditions were found on the intermediate floor. The simulation results also showed that, in many cases, wind flows into and out of the rooms through the left or right side of the opening rather than through the bottom and top of the opening, especially in the case of buildings that are obliquely oriented to the air stream. This phenomenon demonstrates that predictions of single-sided ventilative force using data relating to the bottom and top parts of the opening are not accurate enough.
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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, 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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7

Streckienė, Giedrė, Juozas Bielskus, Dovydas Rimdžius, Vytautas Martinaitis, and Violeta Motuzienė. "Experimental Analysis of an Air Storage Tank in Wind Driven Ventilation System." E3S Web of Conferences 231 (2021): 02003. http://dx.doi.org/10.1051/e3sconf/202123102003.

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With the growing demand for energy efficient HVAC systems and integration of renewable energy sources, existing energy transformers are being improved and new solutions are being sought. Various energy storage technologies are applied to solve unpredictable renewable energy flows. This paper investigates an innovative ventilation system with roof turbine ventilator and variable volume isobaric air tank, which is used to store an excessive wind energy. The study focuses mainly on isobaric air storage tank operation. The experimental results of the tank charging and discharging processes under different operation conditions are presented. These conditions include different weights placed on the top of the storage and air flow rates in the wind tunnel. The operation of the tank during one windy day in chosen location is studied. The obtained data showed the initial results of the operation of the developed ventilation system and possible modifications in order to improve its functionality.
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8

Kukuljan, Lovel, Franci Gabrovsek, and Matthew Covington. "The relative importance of wind-driven and chimney effect cave ventilation: Observations in Postojna Cave (Slovenia)." International Journal of Speleology 50, no. 3 (September 2021): 275–88. http://dx.doi.org/10.5038/1827-806x.50.3.2392.

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Density-driven chimney effect airflow is the most common form of cave ventilation, allowing gas exchange between the outside and the karst subsurface. However, cave ventilation can also be driven by other mechanisms, such as barometric changes or pressure differences induced by the outside winds. We discuss the mechanism and dynamics of wind-driven ventilation using observations in Postojna Cave, Slovenia. We show how seasonal airflow patterns driven by the chimney effect are substantially modified by outside winds. Wind flow over irregular topography forms near-surface air pressure variations and thus pressure differences between cave entrances at different locations. These pressure differences depend on wind speed and direction and their relationship to surface topography and the location of cave entrances. Winds can act in the same or opposite direction as the chimney effect and can either enhance, diminish or even reverse the direction of the density-driven airflows. To examine the possibility of wind-driven flow, we used a computational fluid dynamics model to calculate the wind pressure field over Postojna Cave and the pressure differences between selected points for different configurations of wind speed and direction. We compared these values with those obtained from airflow measurements in the cave and from simple theoretical considerations. Despite the simplicity of the approach and the complexity of the cave system, the comparisons showed satisfactory agreement. This allowed a more general assessment of the relative importance of wind pressure for subsurface ventilation. We are certain that this example is not unique and that the wind-driven effect needs to be considered elsewhere to provide better insights into the dynamics of cave climate, air composition or dripwater geochemistry.
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9

Li, Mao, Yukai Qiang, Xiaofei Wang, Weidong Shi, Yang Zhou, and Liang Yi. "Effect of Wind Speed on the Natural Ventilation and Smoke Exhaust Performance of an Optimized Unpowered Ventilator." Fire 5, no. 1 (January 28, 2022): 18. http://dx.doi.org/10.3390/fire5010018.

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Natural ventilators can maintain the ventilation of buildings and tunnels, and can exhaust fire smoke without requiring energy. In this study, we optimized a natural ventilator by adding axial fan blades (equivalent to adding a fan system) to investigate the effect of wind speed on the ventilation and smoke exhaust performance of an optimized natural ventilator. The experimental results showed that the best configuration of the ventilator was five fan blades at an angle of 25° with set-forward curved fan blades. With this configuration, the ventilation volume of the optimized natural ventilator was increased by 11.1%, and the energy consumption was reduced by 2.952 J. The third experiment showed that, in the case of a fire, the optimized ventilator can reduce the temperature of the ventilator faster than the original ventilator, indicating better smoke exhaust performance. The reason for this effect is that, when the optimized natural ventilator rotates, the rotation of the blades creates a flow field with a more evenly distributed wind speed. The experiments proved that natural ventilators can be optimized by adding a fan system. The results of this study can be applied to effectively improve the ventilation performance of natural ventilators to quickly exhaust smoke in building and tunnel fires, and provide a reference for related research on natural ventilators.
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Idowu, Olusegun Moses, Umar Gidado Marafa, Sani Ajuji Mohammed, and Moses Iorakaa Ayoosu. "VARIATION OF NATURAL VENTILATION WITH FLOOR LEVEL AND ORIENTATION OF CLASSROOMS." International Journal of Education, Psychology and Counseling 7, no. 45 (March 15, 2022): 166–74. http://dx.doi.org/10.35631/ijepc.745013.

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In recent times, the multi-story school building has emerged as a new trend in Nigeria due to land cost in the urban area and population increase due to urban migration resulting from insecurity in rural areas. Among other factors, the floor level and space orientation are believed to affect its natural ventilation. Electricity per capita consumption in Nigeria is very low, suggesting passive ventilation in the building. The ventilation in the classroom is usually through wind-driven systems (windows). The study sought to establish the variation of natural ventilation among classrooms on different floor levels and orientations. In the ex-post facto design, instruments were employed to observe wind speeds and directions in and around selected classrooms in a school building block with two wings on three-floor levels, a perimeter fence, and a built-up residential area. The classrooms on the ground floor were half-opened casement windows, while those on the upper floors had sliding windows. Data generated were subjected to descriptive statistical analysis. In the longer wing classrooms, the mean wind speed and standard deviation obtained were 0.17m/s and 0.123 on the ground floor; 0.15m/s and 0.104 on the first floor; and 0.18m/s 0.126 on the second floor. Corresponding results in the shorter wing classrooms were 0.12m/s and 0,077 on the ground floor; 0.11m/s and 0.095 on the first floor; and 0.17m/s and 0.126 on the second floor. Ventilation coefficients were 0.13, 0.11, and 0.13 respectively on the ground, first, and second floors in the longer wing classrooms, while those in the shorter wing classrooms were 0.13, 0.12, and 0.19 respectively. The findings revealed some direct variation in natural ventilation with the floor level in the studied classrooms, which was more manifested as the floor level increased upwards. In conclusion, the floor level and orientation affect wind-driven ventilation. There is also a need for further field studies on more suitable cases (higher floor levels) to ascertain the level of significance of this variation and the optimisation window area based on floor levels for orientation for wind-driven natural ventilation.
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Дисертації з теми "Wind ventilation"

1

Luo, Zhiwen, and 罗志文. "City ventilation by slope wind." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B46089962.

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2

Wang, Bo. "Unsteady wind effects on natural ventilation." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11653/.

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Ventilation stacks are becoming increasingly common in the design of naturally ventilated buildings. The overall aim of the work described is ultimately to improve design procedures for such buildings. This thesis presents the experimental and theoretical investigation of unsteady wind effects on natural ventilation of a single envelope with multiple openings for both wind alone, and wind and buoyancy combined cases. There are two types of openings: namely the sharp-edged orifice and the long opening (stacks being treated as long openings). Two methods are adopted: 1) direct wind tunnel measurements using the hot-wire technique; 2) theoretical analysis using steady and unsteady envelope flow models. For the wind alone experiments, the influences of wind speed, wind direction and opening configuration on flow patterns are studied. For the wind and buoyancy combined tests, the transitional process between wind dominated and buoyancy dominated states are investigated. The direct velocity measurements provide the criteria for testing the validity of the theoretical models, and ways to improve them. Additionally, improvements are made to the experimental techniques: e.g. a precise unsteady calibration method of the hot-wire is developed; improvements of pressure measurements are also investigated. The experimental technique works well with multiple stacks. Even though small openings are used, some dependence of the mean pressure coefficient on opening configuration is observed. The theoretical models also work reasonably well with multiple stacks, yet it is observed that the accuracy of the theoretical models decrease with the increasing number of openings, and is sensitive to the chosen discharge coefficient which defines the characteristics of ventilation openings.
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3

Al-Qahtani, Turki Haif. "An improved design of wind towers for wind induced natural ventilation." Thesis, University of Bath, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323566.

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4

Straw, Matthew Peter. "Computation and measurement of wind induced ventilation." Thesis, University of Nottingham, 2000. http://eprints.nottingham.ac.uk/10110/.

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This thesis aims to predict wind induced ventilation of a structure through the application of current analytical techniques, computational fluid dynamics simulations and novel techniques for ventilation flows induced by turbulent mechanisms. Validation of the predictions was carried out through full-scale measurements undertaken on a purpose built test structure. The structure was of cubic design with an external dimension of 6m. The construction of this full-scale research structure at Silsoe Research Institute, Bedfordshire, England, provided a unique opportunity for undertaking full-scale experimentation on a fundamental wind engineering test case which, prior to this thesis, had only been investigated using scale models in wind tunnels and computational simulations.
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5

Chaplin, G. C. "Turbulent wind interactions with ventilated structures." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339663.

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6

Hang, Jian, and 杭建. "Wind conditions and urban ventilation in idealized city models." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42841471.

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Hang, Jian. "Wind conditions and urban ventilation in idealized city models." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42841471.

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8

Bensalem, Rafik. "Wind driven natural ventilation in courtyard and atrium-type buildings." Thesis, University of Sheffield, 1991. http://etheses.whiterose.ac.uk/3000/.

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This study investigated the effectiveness of wind-driven natural ventilation in courtyard and atrium-type buildings, particularly in the context of ventilative cooling. Courtyard and atrium buildings are currently enjoying great popularity. Perhaps a primary reason for their revival comes from the energy and environmental awareness of the current period, in which courtyard and atrium concepts are emerging as very promising. Wind-driven ventilation is one of the most basic and probably among the most efficient ways to prevent overheating, and provide cooling in the summer season, especially in humid climates. A review of previous works showed that little attention has been given to the wind-driven natural ventilation capability of these structures, and to the means of maximizing this ventilation. This study was thus aimed to fill part of the gap in this subject. In order to evaluate the wind-driven ventilation effectiveness of these structures, and to examine some of the influential parameters, experimental wind tunnel tests were made. Actual indoor air flows were measured in small replica models of four-storey courtyard and atrium buildings by means of small calibrated orifice plates. A parametric study of the geometry of the courtyard was made in isolation conditions, where the depth and breadth of the courtyard were systematically varied. Several atrium ventilation modes were tested both in isolation and in urban terrains. The tests involved different roof geometries and various roof porosities. The measurements were followed by a discussion on the validity of simple computational methods to predict airflow in atria. The investigation portrayed the importance of some factors, such as the wind orientation rather than the courtyard geometry, for enhancing the flow in these structures. The superiority of some atrium designs over the courtyard types, particularly in sheltered sites, was underlined. The study concluded with a discussion of design guide-lines and referred the reader to an application as an example, describing a simple step-by-step method to estimate the cooling benefits of these structures in a particular site, and making use of the measurement data obtained from the study.
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9

Carey, P. S. "Direct wind tunnel modelling of natural ventilation for design purposes." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422325.

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10

Lishman, Ben Stanley Roy. "The control of natural ventilation with opposing wind and buoyancy." Thesis, University of Cambridge, 2007. https://researchportal.port.ac.uk/portal/en/theses/the-control-of-natural-ventilation-with-opposing-wind-and-buoyancy(97d0423b-9083-4078-bd8c-009141a8559e).html.

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This thesis is an investigation of the control of naturally ventilated buildings subject to opposing wind and buoyancy. Previous research shows that the interaction of wind and buoyancy can lead to complicated behaviour, and that this in turn can make it difficult to design controllers for naturally ventilated buildings. The aim of this research is therefore to aid in the design of such controllers.
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Книги з теми "Wind ventilation"

1

El-Gowhary, Hatem Yousary. Wind catchers: A ventilation strategy for the future in hot regions - with reference to Egypt. London: University of East London, 1998.

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2

Gids, W. F. de. The effect of surrounding buildings and fluctuations in wind pressure differences on the ventilation of dwellings. Luxembourg: Commission of the European Communities, 1987.

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3

Stock, David E. Wind tunnel study of fresh air inlet locations for Kennedy Library. Pullman, WA: Washington State University, 1995.

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4

Got sun? go solar: Harness nature's free energy to heat and power your grid-tied home. 2nd ed. Masonville, CO: PixyJack Press, 2009.

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5

Ewing, Rex A. Got sun? go solar: Get free renewable energy to power your grid-tied home. Masonville, CO: PixyJack Press, 2005.

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6

Ewing, Rex A. Got sun? go solar: Get free renewable energy to power your grid-tied home. Masonville, CO: PixyJack Press, 2005.

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7

Dihqānī, ʻAlī Riz̤ā, 1978 or 1979-, ed. Bādgīr, shāhkār-i muhandisī-i Īrān. Tihrān: Yazdā, 2008.

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8

Wind-driven Natural Ventilation Systems. BSRIA, 2005.

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9

Jones, Phil, and Don Alexander. Wind Tunnel Modelling and Ventilation Design. Butterworth-Heinemann Ltd, 2000.

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10

Foss, James Robert. Evaluation of building exhaust gas dilution models using field and wind tunnel measurements. 1994.

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Частини книг з теми "Wind ventilation"

1

Ohba, Masaaki. "Ventilation Flow Structure and High-Precision Ventilation Network Model." In Advanced Environmental Wind Engineering, 51–74. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55912-2_3.

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2

Etheridge, David. "Design Procedures for Natural Ventilation." In Advanced Environmental Wind Engineering, 1–24. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55912-2_1.

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3

Dunster, Bill, Craig Simmons, and Bobby Gilbert. "ZEDfactory Wind Cowl Passive Heat Recovery Ventilation System." In the ZED book, 167–78. London: Taylor & Francis, 2021. http://dx.doi.org/10.4324/9781003073130-16.

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4

Morgan, Lynette. "The greenhouse environment and energy use." In Hydroponics and protected cultivation: a practical guide, 30–46. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789244830.0030.

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Abstract This chapter discusses the greenhouse environment and its energy use. Its heating, cooling, shading, ventilation and air movement, humidity, carbon dioxide enrichment, automation, energy use and conservation in protected cropping, renewable energy sources for protected cropping such as geothermal energy, solar energy, passive solar energy, wind-generated energy, biomass and biofuels are also discussed.
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Morgan, Lynette. "The greenhouse environment and energy use." In Hydroponics and protected cultivation: a practical guide, 30–46. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789244830.0003.

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Abstract This chapter discusses the greenhouse environment and its energy use. Its heating, cooling, shading, ventilation and air movement, humidity, carbon dioxide enrichment, automation, energy use and conservation in protected cropping, renewable energy sources for protected cropping such as geothermal energy, solar energy, passive solar energy, wind-generated energy, biomass and biofuels are also discussed.
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6

Yaganoglu, A. Vahap. "Ridge vent, wind direction and wind velocity effects on closed, naturally ventilated cattle-building ventilation." In Agricultural Engineering, 1441–47. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003211471-90.

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7

Li, Zhenzhen, Chao Chen, Le Yan, Song Pan, and Lili Zhang. "“Cross-Ventilation” Effect of Piston Wind and Energy-Saving Evaluation for the Ventilation and Air Condition in Subway Station." In Lecture Notes in Electrical Engineering, 147–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39578-9_16.

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AlAkaby, Eman Ahmed Elsayed Mahmoud. "Utilizing Wind-Driven Ventilation Force as a Technique in Adaptive Passive Interior Design." In Towards Implementation of Sustainability Concepts in Developing Countries, 171–83. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74349-9_14.

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9

Bencheikh, H. "The Effect of Wind Velocity and Night Natural Ventilation on the Inside Air Temperature in Passive Cooling Ventilation in Arid Zones." In Renewable Energy in the Service of Mankind Vol I, 423–32. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17777-9_38.

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Das, Soumalya, Shrikant D. Mishra, R. N. Sarangi, Raghupati Roy, and Arvind Shrivastava. "Soil-Structure-Interaction Study and Safety Assessment of Ventilation Stack for Extreme Wind Events." In Lecture Notes in Civil Engineering, 75–88. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5673-6_7.

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Тези доповідей конференцій з теми "Wind ventilation"

1

Ghaderi, Roozbeh, and Mohammed Javad Khoshharf. "Building Ventilation by Wind." In Architectural Engineering Conference (AEI) 2008. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/41002(328)56.

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2

Aktan, E. Ö. Aktuğlu. "Wind ventilation in the built environment." In ENERGY QUEST 2014. Southampton, UK: WIT Press, 2014. http://dx.doi.org/10.2495/eq140702.

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3

Cui, D. J., C. M. Mak, and K. C. S. Kwok. "Effects of Building Configuration on Ventilation Performance of Naturally-Ventilated Building." In Eighth Asia-Pacific Conference on Wind Engineering. Singapore: Research Publishing Services, 2013. http://dx.doi.org/10.3850/978-981-07-8012-8_275.

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4

Ghaddar, Nesreen, Kamel Ghali, and Bassel Jreije. "Ventilation of Wind-Permeable Clothed Cylinder Subject to Periodic Swinging Motion." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32052.

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Анотація:
A theoretical and experimental study has been performed to determine ventilation induced by swinging motion and external wind for a fabric-covered cylinder of finite length representing a limb. The estimated ventilation rates are used in determining the sensible heat loss form a clothed cylinder using a simplified resistance model. A model is developed to estimate the external pressure distribution resulting from the relative wind around the swinging clothed cylinder. A mass balance equation of the microclimate air layer is reduced to a pressure equation assuming laminar flow in axial and angular directions and that the air layer is lumped in the radial direction. The ventilation model predicted the total renewal rate during the swinging cycle. A good agreement was found between the predicted ventilation rates at swing frequencies between 40 and 60 rpm and measured values from experiments conducted in a controlled environmental chamber (air velocity is less than 0.05 m/s) and used the tracer gas method to measure the total ventilation rate induced by the swinging motion of a cylinder covered with cotton fabric for both closed and open aperture cases. A parametric study using the current model is performed on cotton fabric to study the effect of wind on ventilation rates for a non-moving clothed limb at wind speeds ranging from 0.5–8 m/s, the effect of a swinging limb in stagnant air at frequencies up to 80 rpm, and the combined effect of wind and swinging motion on the ventilation rate. For a non-moving limb, ventilation rate increases with external wind. In absence of wind, the ventilation rate increases with increased swinging frequency. The combined effect of wind and swing is not additive of the single effects at high wind speed while at low frequency it can be assumed additive for wind speeds below 2 m/s and frequencies below 40 rpm. The heat transfer by ventilation is more than 50% of total heat loss from a clothed cylinder at f = 80 rpm in abs cense and presence of wind.
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5

Soares, S. "34. Influence of Wind on Industrial Ventilation Networks Behavior." In AIHce 2006. AIHA, 2006. http://dx.doi.org/10.3320/1.2759034.

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6

Fu, Runzhi, Caifeng Wei, and Jingde Zhao. "Ventilation Energy Conservation in Highway Tunnel with Piston Wind." In 2019 4th International Conference on Electromechanical Control Technology and Transportation (ICECTT). IEEE, 2019. http://dx.doi.org/10.1109/icectt.2019.00091.

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7

Mike Brugger and Timothy LaFrance. "Overview of Wind Pressure Coefficients Related to Natural Ventilation Performance." In 2005 Tampa, FL July 17-20, 2005. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2005. http://dx.doi.org/10.13031/2013.19521.

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8

Janatifar, Reza, Lyazid Djenidi, and Michael Ostwald. "Study of Natural Ventilation Performance Relative to Different Wind Directions." In 22nd Australasian Fluid Mechanics Conference AFMC2020. Brisbane, Australia: The University of Queensland, 2020. http://dx.doi.org/10.14264/bd81a08.

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9

Abdo, Peter, Rahil Taghipour, and B. P. Huynh. "Three Dimensional Simulation of Ventilation Flow Through a Solar Windcatcher." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5383.

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Анотація:
Abstract Natural ventilation is the process of supplying and removing air through an indoor space by natural means. There are two types of natural ventilation occurring in buildings: winddriven ventilation and buoyancy driven or stack ventilation. The most efficient design for natural ventilation in buildings should implement both types of natural ventilation. Stack ventilation which is temperature induced is driven by buoyancy making it less dependent on wind and its direction. Heat emitted causes a temperature difference between two adjoining volumes of air, the warmer air will have lower density and be more buoyant thus will rise above the cold air creating an upward air stream. Combining the wind driven and the buoyancy driven ventilation will be investigated in this study through the use of a windcatcher natural ventilation system. Stack driven air rises as it leaves the windcatcher and it is replaced with fresh air from outside as it enters through the positively pressured windward side. To achieve this, CFD (computational fluid dynamics) tool is used to simulate the air flow in a three dimensional room fitted with a windcatcher based on the winddriven ventilation alone, buoyancy driven ventilation alone, and combined buoyancy and winddriven ventilation. Different wind speeds between 0 up to 2.5 m/s are applied and the total air flow rate through the windcatcher is investigated with and without temperature of 350 K applied at the windcatcher’s outlet wall. As the wind speed increased the efficiency of the solar windcatcher decreased.
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10

Bu, Zhen, and Yan Lin. "Experimental Investigation of Wind-Driven Natural Ventilation in an Areaway-Attached Basement: Wind Tunnel Measurements of Wind Pressures." In 2011 Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2011. http://dx.doi.org/10.1109/appeec.2011.5748757.

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