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Tesis 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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1

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 thi

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2

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.<br>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 di

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3

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.<br>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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4

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.<br>Based on the equations of energy and momentum conservation, a model was formulated to predict the air flow performance of perforated ventilation duct

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5

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.<br>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.<br>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: $V = H sb{o}{X over L} + (V sb{L}-H sb{o}) {X sp2 over L sp2}$.<br>This

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6

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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7

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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8

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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9

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 perfo

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10

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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11

Mak, Cheuk-Ming. "The application of computational fluid dynamics to the prediction of regenerated noise in ventilation systems." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321131.

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12

Tsui, Ka-cheung. "Neighborhood ventilation of a building cluster by combined forces." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B42182128.

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13

Lane-Serff, Gregory. "Heat flow and air movement in buildings." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276888.

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14

Jangam, Ranjit. "Relationship between damper resistance and damper insertion depth." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4509.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains xi, 97 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 62-63).

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15

Judy, Christopher Daniel Shon Paul. "Evaluating the effects of elbows and duct size on the accuracy of hand-held pitot traverse flow measurements." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5479.

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Thesis (M.S.)--West Virginia University, 2007.<br>Title from document title page. Document formatted into pages; contains v, 44 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 39-40).

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16

Abdul, Ghani S. A. A. "An investigation into water ingress through ground vehicle heating ventilation and air conditioning unit." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268509.

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17

Aguirre, Sánchez Mikel. "Air flow disturbance by moving objects at local exhaust ventilation." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-19719.

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The present thesis aims to study the effect of human movements on local exhaust ventilation. In its simplest terms, local exhaust ventilation is a system which has the function of extracting contaminated air situated close to the contaminant source, protecting a working person from exposure to hazardous substances by containing or capturing them locally, at the emission point. As an important security measure referred to terms of health, it is crucial for the healthiness of workers to control and prevent them from the exposure to vapour, mist, dust or other airborne contaminants. Additionally,

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18

Wrisdale, Ian Edward. "Flow prediction for three-dimensional intakes and ducts using viscous-inviscid interaction methods." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293854.

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19

Tsui, Ka-cheung, and 徐家祥. "Neighborhood ventilation of a building cluster by combined forces." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B42182128.

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20

Jouini, Dhafer Ben Mahmoud Carleton University Dissertation Engineering Mechanical. "Experimental investigation of the ventilation air flow properties in an office space." Ottawa, 1992.

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21

Grbál, Jakub. "Analýza větrání banky." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409864.

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The aim of the diploma thesis is the simulation of different types of air conditioners using the CFD methods. The main goal of this thesis is to design the most suitable type of air conditioning in the consideration room, due to the air flow rate in the residental area. The conclusion of the work is to devote the design of air conditioning system with the application of selected type of air conditioning based on the results of CFD simulations.

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22

McBrien, Robert K. 1958. "Pressure measurements for periodic fully developed turbulent flow in rectangular interrupted-plate ducts." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65434.

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23

Mohammad, W. S. "Space air-conditioning of mechanically-ventilated rooms : computation of flow and heat transfer." Thesis, Cranfield University, 1986. http://hdl.handle.net/1826/4022.

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Computational studies of two- and three-dimensional, turbulent recirculating flows within mechanically-ventilated enclosures are reported. Two principal cases are examined: (i) two-dimensional offset jets: and (ii) three-dimensional flow induced in rooms by supply jets emanating from low or high side-wall registers. The calculations were undertaken using iterative finite-domain proceedures which solve the conservation equations for mass, momentum and enthalpy, together with additional transport equations for the turbulent kinetic energy and its dissipation rate . The effect of buoyancy waS. ex

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24

Li, Fan. "Application of computational fluid dynamics to the study of air flow in buildings." Thesis, University of Westminster, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283467.

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25

Ip, Kenneth C. W. "Dynamic modular simulation of variable water and air volume flow systems in buildings." Thesis, University of Bristol, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251526.

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26

Hill, S. D. "Casing treatment for an industrial axial flow fan." Thesis, Cranfield University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241843.

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27

Al-Nizari, Hamdan Omar A. "Dynamic performance and refrigerant flow control in refrigeration systems." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315452.

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28

Houston, Stephen Douglas. "Tube-side flow and heat transfer in package boilers." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/804.

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29

Basharhagh, M. Zia. "Recess vane passive stall control for axial flow fans." Thesis, Cranfield University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305269.

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30

El-Hawat, Salem M. "Numerical modelling of flow and heat transfer for high-performance surfaces." Thesis, University of Brighton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251804.

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31

Tough, M. C. "A heat transfer model of forced convection, cross flow heat exchangers used in space heating." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259171.

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32

Viguer, Torres Luis, and Perez Borja Fatas. "Computer simulations of temperature and flow field in industrial spaces using confluent jets air supply method." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-12409.

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Ventilation systems are closely connected to indoor environment. In industrial spaces it has a major impact due to air quality and thermal comfort requirements, which leads into health and economy improvements. Confluent jets ventilation system has been assess in Söderhamn Eriksson, a machinery company located in Mariannelund, Sweden, since it has been proved as the best ventilation performance. Moreover this system is worthy for both heating and cooling purposes, although just heating case will be developed in this thesis. By means of modelling software such as Gambit and Airpak, the company’

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33

Myjavec, Patrik. "Optimalizace vzduchotechniky výrobní haly." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391909.

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Diploma thesis is divided into two parts. The theoretical part deals with natural ventilation and the practical part focuses on the optimization of the ventilation in the original hall using CFD simulation. One of the solutions is proposed in the design part of the diploma thesis.

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34

Massey, Kevin C. "Flow/acoustic coupling in heated and unheated free and ducted jets." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11971.

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35

Ho, Son Hong. "Numerical simulation of thermal comfort and contaminant transport in air conditioned rooms." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000548.

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36

Štencel, Bedřich. "Distribuce vzduchu při větrání bytů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225398.

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My thesis is divided into three separate parts. The first part is devoted to the theoretical part of the ventilation systems. The second part deals with the determination of the conditions for a number of air exchange, a comparison of three variants of the location of air outlets in dwelling units and the application image airflow from experimental measurements on the common room. The third part is focused on the description of the experimental tasks in the laboratory at the Institute building services.

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37

Bombera, Jiří. "Simulace koncových elementů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371836.

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The aim of the diploma thesis is the simulation of air valves and difusers using CFD. The goal of this thesis is to determinate the type of air valve and diffusor, which would ventilate the room of a detached house the best – considering the speed of the airflow and the age of the air. Outcome of this work is the design of the air conditioning system for a detached house with application of the air valve and difuser which is evaluated as the ideal option for the ventilation in the room.

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38

Johansson, Tom, and Viktor Ryberg. "Val av ventilationssystem för kontorsverksamhet : En kostnadsjämförelse." Thesis, KTH, Byggteknik och design, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-149462.

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Enligt Folkhälsomyndighetens uppgifter påstår 18 procent av den vuxna populationen att de lider av symtom relaterat till inomhusmiljön. Symtomen kan beröra alldagliga ohälsor däribland trötthet och huvudvärk till allvarliga åkommor såsom cancer (Folkhälsomyndigheten, 2013). Då ventilationens huvuduppgift är att tillgodose kraven på inomhusklimatet och därmed förebygga ohälsa, berör detta examensarbete problematiken kring ventilationssystemets utformning och dess ekonomiska konsekvenser. Syftet med arbetet var att identifiera vilken luftflödesprincip som är kostnadseffektivast för kontorsverksa

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39

O'Sullivan, Paul D. "Experimental study of single sided ventilation through a multi-configuration slotted louvre system." Thesis, Brunel University, 2018. http://bura.brunel.ac.uk/handle/2438/16416.

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Evidence based performance of novel ventilation systems in existing low energy buildings is invaluable as it provides data on the system operation in a real dynamic environment. This thesis presents the outcomes from research involving a number of experimental field studies of a single sided ventilation system installed in a single cell office space as part of a building retrofit pilot project in Cork, Ireland. The solution consists of a purpose provided, multi configuration opening, comprising a narrow slotted architectural louvre component split across a low level manual opening section and

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40

Ahlgren, Tobias, and Jalal Eliassi. "Värmeförluster vid utvändigt placerade ventilationssystem." Thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-20676.

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To be able to handle tomorrows need for limited energy consumption we need to reduce our use of energy. The building sector stands for around 40 % of all energy consumption in the society. The government has put up a goal to reduce the energy consumption in our buildings with 20 % by year 2020 and 50 % by year 2050 compared with year 1995. To be able to do reach that goal we need a more energy efficient building stock. The main part of the energy used in our buildings is used for space heating. By installing ventilation systems with heat recovery on the exhaust air it is possible to use the he

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41

Hayati, Abolfazl. "Natural Ventilation and Air Infiltration in Large Single‑Zone Buildings : Measurements and Modelling with Reference to Historical Churches." Doctoral thesis, Högskolan i Gävle, Energisystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24612.

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Natural ventilation is the dominating ventilation process in ancient buildings like churches, and also in most domestic buildings in Sweden and in the rest of the world. These buildings are naturally ventilated via air infiltration and airing. Air infiltration is the airflow through adventitious leakages in the building envelope, while airing is the intentional air exchange through large openings like windows and doors. Airing can in turn be performed either as single-sided (one opening) or as cross flow ventilation (two or more openings located on different walls). The total air exchange affe

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42

Ekl, Martin. "Experimentální stanovení charakteristik proudění vzduchu z distribučních prvků." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226017.

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The thesis is aimed at the problem of the air distribution in buildings. The object of research is the concert hall. The thesis contains three different technical proposals and technical views of the microclimate concert hall. The microclimate’s solutions are focused on the air distribution in the hall. The part of the thesis is an experiment. The experiment continues on the one of the technical proposals. Its purpose is to determine the characteristics of air flowing from distribution element.

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43

Kanaani, Hussein. "Real time detectionof airborne fungal spores and investigations into their dynamics in indoor air." Queensland University of Technology, 2009. http://eprints.qut.edu.au/30350/.

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Concern regarding the health effects of indoor air quality has grown in recent years, due to the increased prevalence of many diseases, as well as the fact that many people now spend most of their time indoors. While numerous studies have reported on the dynamics of aerosols indoors, the dynamics of bioaerosols in indoor environments are still poorly understood and very few studies have focused on fungal spore dynamics in indoor environments. Consequently, this work investigated the dynamics of fungal spores in indoor air, including fungal spore release and deposition, as well as investigating

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44

Alhakim, Ali, and Roz Hakim. "Inneklimat i kontorsmiljö : Utvärdering av inneklimat i en kontorsmiljö med fokus på ventilationen." Thesis, KTH, Byggteknik och design, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231499.

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I dagens samhälle tillbringar människan ca 90 procent av sin tid inomhus, vilket innebär att människan befinner sig i konstgjort inomhusklimat. Då människan tenderar att befinna sig inomhus är det stor vikt att ventilationen ska fungera så bra som möjligt och att inomhusklimatet är tillfredsställande för vårt välmående och välbefinnande på arbetsplatsen. Tidigare studier visar att nästan hälften av svenskar är missnöjda med ventilationen i deras arbetsmiljö (kontor). Ett bra inomhusklimat i kontorsmiljöer ökar tillfredställandet hos personalen, ökar produktiviteten samt minskar sjukfrånvaron.

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45

Gaidžiūnaitė, Daiva. "Oro srauto pasiskirstymo pagrindiniame ortakyje tyrimai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110602_114712-40431.

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Darbo apimtis 42 puslapiai, jame yra 15 paveikslų ir 2 lentelės. Literatūros sąraše 31 šaltiniai(iš jų 11 rusų kalba). Darbo pradžia 2009.09.01 pabaiga 2011.05. Šio darbo tikslas – nustatyti debito koeficiento kitimą išilgai pagrindinio ortakio, priklausomai nuo šoninių ortakių aerodinaminio pasipriešinimo ir tiekiamo oro srauto. Ekspermentinio stendo pagalba nustatyti faktinis oro pasiskirstymas išilgai pagrindinio ortakio. Matematinio modulio pagalba apskaičiuotas teorinis oro pasiskirstymas, kai oras išteka į šoninius ortakius veikiamas statinio slėgio. Išanalizavus rezultatus nustatytas de

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46

Yin, Youbing. "MDCT-based dynamic, subject-specific lung models via image registration for CFD-based interrogation of regional lung function." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/1112.

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Computational fluid dynamics (CFD) has become an attractive tool in understanding the characteristic of air flow in the human lungs. Inter-subject variations make subject-specific simulations essential for understanding structure-function relationship, assessing lung function and improving drug delivery. However, currently the subject-specific CFD analysis remains challenging due, in large part to, two issues: construction of realistic deforming airway geometry and imposition of physiological boundary conditions. To address these two issues, we develop subject-specific, dynamic lung models by

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47

Urban, Ondřej. "Větrání tělocvičny." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372264.

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The master thesis deals with flow modeling in the CFD program. By means of which the opti-mal version of the air distribution diffuser in the sports hall will be selected. The first variant will bring fresh air through textile diffusers. The second variant will bring fresh air through flooded large circular diffusers. The tested parameter of the indoor environment will be the flow velocity and the age of the air. The better-performing version will be processed as an implementation documentation.

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48

Olausson, Jesper. "Energy efficiency in a renovated modern office with activity-based work style." Thesis, Högskolan i Gävle, Energisystem och byggnadsteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-30113.

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During renovation Ljusåret 2 was converted to a modern office with an activity based work style (ABW) with a Demand Controlled Volume (DCV) ventilation system connected to a closed-loop duct. Cooling is provided through air handling units and active water based beams, the underfloor heating system was kept. Written instruction and specification have been studied for the two different control systems Schneider EcoStructure and Lindinspect. Both control systems have been analyzed according to time schedule, set-point and process value by using different functions in software. To be able to perfo

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Lapáček, Milan. "Čištění vzduchotechnických systémů a dosažitelné energetické úspory." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232143.

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The main aim of this thesis is to explore fouling of air ducts and its influence on energy consumption of HVAC systems. The first part focuses on typical parts that create the IAQ in buildings and on evaluating energy consumption of air transportation. The following section deals with the theories of fluid flow, flow regimes and pressure losses that are created as a side effect. The thesis outlines possible methods of assessing the impact of pollution with an emphasis on pressure losses and their influence on the fan power consumption. The actual experimental measurement, conducted in a select

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Romero, João Vitor Fontenele. "Estudo experimental de sonda direcional para determinação da velocidade do escoamento de ar." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3150/tde-19072011-104247/.

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O presente trabalho trata do desenvolvimento de uma sonda de pressão para medição de magnitude e direção da velocidade em um escoamento de ar. Primeiramente, é feita uma pesquisa sobre métodos e instrumentos de medição de velocidade de escoamentos de ar, utilizando a literatura existente sobre os tipos de medidores e suas restrições e capacidades na medição de direção do escoamento. Em seguida, são escolhidos dois tipos de medidores capazes de atender aos requisitos de fabricação simples e robusta, sendo um deles aplicado a escoamentos bidimensionais (sensor de três orifícios, tipo prisma) e o

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