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Dissertations / Theses on the topic 'Air ducts Air ducts'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Aydın, Çiğdem Özerdem M. Barış. "Air leakage detection in various cross sectioned air ducts and research on manufacturing methods for airtightness/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/makinamuh/T000515.pdf.

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2

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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3

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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4

Gibbs, Daniel Chad. "Laboratory testing of ducts and fittings to determine pressure loss characteristics a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=30&did=1913184291&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1265044286&clientId=28564.

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5

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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6

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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7

McNicol, Ian David. "Active adaptive cancellation of sound in ducts /." Title page, contents and synopsis only, 1985. http://web4.library.adelaide.edu.au/theses/09ENS/09ensm169.pdf.

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8

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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9

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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10

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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11

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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12

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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13

Uosukainen, Seppo. "JMC method applied to active control of sound : theoretical extensions and new source configurations /." Espoo [Finland] : Technical Research Centre of Finland, 1999. http://www.vtt.fi/inf/pdf/publications/1999/P386.pdf.

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14

Wei, Cheng. "Air Induction System (AIS) Optimization." Thesis, KTH, Fordonsdynamik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198507.

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Air intake system (AIS) plays an important role on affecting the performance of the engine and the vehicle. The design and optimization of the structures and materials of AIS contributes to producing a quality reliable system, reducing noise, cost and weight at the same time, which are significant to improve the performance of engine and vehicle. Fresh air hoses/pipes are intended to transport, in air cleaner purified, air from the air cleaner to the throttle fitted on the inlet manifold or to the compressor fitted to the exhaust manifold. Air cleaner box is responsible for filtering out the d

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15

Rosell, Olle. "Modelling and simulations for analysing thermal performance enhancement in air ducts with cold surface and hot air." Thesis, Karlstads universitet, Institutionen för ingenjörs- och kemivetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-66677.

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The world today has large challenges in order to manage a changing climate and the consequences that the climate change has on the environment and human living standards. This climate change is largely affected by the emissions of greenhouse gases, which come from usage of fossil fuels. This is a global problem that will affect the whole world and cause an increase of mean global temperature, which would lead to drastically changes in the living environment for human beings. A large part of the use of fossil fuels is connected to electric energy production. In EU almost half of the electric en

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16

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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17

Michaud, Alexander Page. "Experimental Investigation of Reflection of Airborne Noise at Duct Terminations." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16209.

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Noise between 25-500 Hz is a common problem in Heating, Ventilating, and Air Conditioning (HVAC) systems. The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Handbook lists values of end reflection loss (ERL), a frequency dependent parameter describing energy reflected back up a duct at a termination impedance, to help engineers design and account for noise. The ASHRAE Handbook does not account for common termination variations and only lists ERL values using octave bands down to 63 Hz. This thesis experimentally determined the ERL of a variety of rectang

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18

Küpper, Christoph. "A study of the application of air-jet vortex generators to intake ducts." Thesis, City University London, 1999. http://openaccess.city.ac.uk/7750/.

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Many modem combat aircraft have S-bend intake ducts supplying air to the engine compressor. At high Mach number and/or extreme manoeuvre conditions such ducts can produce excessive flow distortions at the engine face due to flow separating at the first bend of the duct. It has been proposed that vortex generators may be usefully employed in such intake ducts to enhance the homogeneity of the pressure distribution at the engine face, and hence, reduce the unsteady loading on the engine. Both vane and air jets have been tested experimentally as vortex generators and each has been found to reduce

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19

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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20

Slagley, Jeremy Michael. "Effects of diameter and cross-sectional partitioning on active noise control in round ducts." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4490.

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Thesis (Ph. D.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains ix, 77 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 75-77).

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21

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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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

Gottmann, Matthias 1964. "Local wall shear stress and interface behavior of adiabatic air-water flows in rectangular ducts." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282445.

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An experiment was designed and built to study vertical annular air-water flows in a channel with a rectangular cross section with no heat transfer. Flush-wire electrical conductivity probes were theoretically analyzed to demonstrate their potential to accurately measure liquid film thickness in the experiment with high temporal and spatial resolution. Flush-wire probes were then successfully implemented and film thickness measurements obtained. From theoretical analysis, the suitability of micromachined hot film and floating element wall shear stress sensors for measurements of wall shear stre

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24

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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25

Lakkundi, Avinash Basavraj Soschinske Kurt A. "Prediction of crack growth in aircraft engine bleed air ducts using finite element and crack growth analysis." Diss., Click here for available full-text of this thesis, 2006. http://library.wichita.edu/digitallibrary/etd/2006/t011.pdf.

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Thesis (M.S.)--Wichita State University, Dept. of Mechanical Engineering.<br>"May 2006." Title from PDF title page (viewed on October 19, 2006). Thesis adviser: Kurt Soschinske. Includes bibliographic references (leaves 71-75).

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26

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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27

Snyder, Scott D. "A fundamental study of active noise control system design /." Title page, contents and abstract only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phs675.pdf.

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28

Šmejdová, Jaroslava. "Klimatizace kancelářských prostor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230451.

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Diploma thesis is focused on the design and dimensioning of the central air-condition system of the offices in two-story building. The thesis consists of a theoretical part which deals with air- condition systems, and computation and design part. The computation part is comprised of calculation of quantity of ventilation air, calculation of heat losses and heat gains and psychrometric evaluation of operation during summer and winter. Design part consists of design and dimensioning of air-distriutions and air ducts and consist of design of air-conditioner and machine room. There are specificati

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29

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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30

Taclík, Jakub. "Klimatizace kanceláří." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-316998.

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The aim of this diploma thesis is to design the air conditioning system for one floor of the offices. The thesis is divided into theoretical, computational and design part. The computational part consists in determining the amount of ventilation air, calculation of heat losses, heat gains and psychrometric calculations for summer and winter season. Based on the calculated values, air ducts, end-points and air-conditioning units are designed. The diploma thesis is supplemented with a list of materials and drawing documentation.

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31

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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32

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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33

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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34

Ranganathan, Sreenivasan. "Influence of Dusts on Premixed Methane-Air Flames." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/86.

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Influence of dust particles on the characteristics of premixed methane-air flames has been studied in this dissertation. Experiments are performed in a Bunsen burner type experimental set-up called Hybrid Flame Analyzer (HFA), which can be used to measure the burning velocity of gas, dust, and hybrid (gas and dust) premixed flames at constant pressure operating conditions. In the current study, analysis of particle-gas-air system of different types of dust particles (at particle size, dp = 75-90 Âµm) in premixed methane-air (ϕg = 0.8, 1.0 and 1.2) flames. Coal, sand, and sodium bicarbonate par

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35

Michael, Michalakis Christaki. "Noise generation by duct terminations." Thesis, London South Bank University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240206.

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36

Davis, Paul Joseph Brian. "In vitro biological effects of mineral dusts and polycyclic aromatic hydrocarbons (PAHs)." Thesis, University of Surrey, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304940.

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37

Adisesh, Linganatha Anil. "Exhaled air nitric oxide and occupational exposure to organic dusts and endotoxin." Thesis, University of Manchester, 2003. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:86766.

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38

Johnson, Kyle Jacob. "AXISYMMETRIC AIR AUGMENTED METHANOL/GOX ROCKET MIXING DUCT EXPERIMENTAL THRUST STUDY." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/930.

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A hot-flow axisymmetric Air Augmented Rocket (AAR) test apparatus was constructed to test various mixing duct configurations at static conditions. Primary flow for the AAR was provided through a liquid methanol-gaseous oxygen bipropellant rocket. Experimental thrust measurements were recorded and propellant mass flow rates and chamber conditions were calculated using an iterative solver dependant on recorded propellant line stagnation pressures. Primary rocket flow produced thrust ranging from 14 to 17.9lbf. Primary mass flow rate through testing ranged from 0.071 to 0.085lbm/s with calculated

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39

Hickman, Craig. "Determining the effects of duct fittings on volumetric air flow measurements." Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/4229.

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Master of Science<br>Department of Mechanical and Nuclear Engineering<br>B. Terry Beck<br>The purpose of the research was to quantify the influence of several duct disturbances on volumetric flow rate measurements and use these in developing guidelines for field technicians. This will assist the field technicians in making more accurate volumetric air flow measurements in rectangular ducts during a test and balance operation. Multiple duct sizes, fittings, probes, traverse algorithms, and locations upstream and downstream of the disturbances are used to compare a variety of situations. Th

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40

Cortes, Capetillo Azael Jesus. "Computational fluid dynamic modeling of in-duct UV air sterilisation systems." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/9591/.

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In-duct UVC air sterilisation is a technology that can help in the reduction and control of airborne diseases. Nevertheless, improvements in sterilisation performance efficiency are required for the technology to succeed in an increasingly restricted energy society. Computational fluid Dynamics (CFD) was used to systematically improve the performance of in-duct UVC air sterilisation systems. The Discrete Ordinates method (DO) was used to model lamp irradiation, and a user defined function (UDF) to model the injection of microorganisms inside the duct to then calculate the average UV dose of th

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41

Patel, Kalpesh B. "The effectiveness of ventilated sanders in controlling inhalable dusts during scuff sanding on military aircraft /." Oklahoma City : [s.n.], 2001. http://library.ouhsc.edu/epub/theses/Patel-Kalpesh.pdf.

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42

Stewart, Lloyd Dorton. "Gas turbine inlet duct air temperature measurement using CO[subscript]2 infrared absorption." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/17367.

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43

Petr, Lukáš. "Klimatizace líhně kuřat." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228778.

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My diploma thesis focuses on design of air-conditioning system for chicken breeding spaces. In the background are considered general issues of air-conditioning, hatchery layout and microclimate for eggs incubation and chicken breeding. The research part is divided into two parts – Calculations and Design. The Calculations address the amount of incoming fresh air, heat loss, heat load and psychrometric calculations for summer and winter periods. The Design focuses on defining suitable diffusers and air-ducts, optimal air-conditioning unit with fans corresponding to hatchery requirements and pre

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44

Al, Dwaikat Hadeel Majed. "Air pollution by aeolian dusts in Amman and Levant Jordan : environmental controls and potential health hazards." Thesis, Coventry University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436265.

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45

Sun, Haomin. "Study on Upward Air-Water Two-Phase Turbulent Flow Characteristics in a Vertical Large Square Duct." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188585.

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46

Popish, Martin Roy. "Primary and Secondary Flow Interactions in the Mixing Duct of a 2-D Planer Air Augmented Rocket." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/766.

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Experiments were conducted on the Cal Poly air augmented rocket (AAR) in order to characterize two-dimensional flowfield phenomenon occurring in the mixing duct. The testing utilized a direct connect system where high pressure nitrogen is fed into the combustion chamber, to form a primary flow. The high pressure nitrogen is then expanded through a nozzle, with an area ratio of 22 and an exit area of 0.75 in2, up to Mach 4.3. Secondary air is entrained from a plenum chamber which is used to create a lower stagnation pressure for the secondary flow. The two flows mix in a duct that has a cro

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47

Asiedu, Yaw. "Life-cycle cost analysis and probabilistic cost estimating in engineering design using an air duct design case study." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0033/NQ63835.pdf.

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48

Hernández, Marco Manuel. "A non-linear quasi-3D model for air management modelling in engines." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/103683.

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El modelado se ha convertido en los últimos años en una herramienta esencial en el diseño de motores de combustión interna alternativos, ya que permite reducir considerablemente el tiempo y los costes de desarrollo. Las metodologías de diseño clásicas se basan en la fabricación de prototipos y la realización de pruebas de ensayo y error. Actualmente, la mayoría de estas pruebas han sido sustituidas por cálculos numéricos, de modo que sólo las opciones de diseño más prometedoras se prueban en realidad en banco motor. Durante años, los códigos unidimensionales de dinámica de gases en el dominio

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49

Montre, Trevor Allen. "Experimental Investigation of a 2-D Air Augmented Rocket: Effects of Nozzle Lip Thickness on Rocket Mixing and Entrainment." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/662.

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Cold-flow tests were performed using a simulated Air Augmented Rocket (AAR) operating as a mixer-ejector in order to investigate the effects of varied primary nozzle lip thickness on mixing and entrainment. The simulated primary rocket ejector was supplied with nitrogen at a maximum chamber stagnation pressure of 1712 psi, and maximum flow rate of 1.67 lbm/s. Secondary air was entrained from a plenum, producing pressures as low as 6.8 psi and yielding maximum stagnation pressure ratios as high as 160. The primary ejector nozzles each had an area ratio of approximately 20, yielding average prim

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50

SCAPIN, VALDIRENE de O. "Avaliacao da contaminacao por elementos inorganicos e esteres ftalicos em poeira domestica da regiao metropolitana de Sao Paulo." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9495.

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Made available in DSpace on 2014-10-09T12:27:18Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:13Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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