Relevant bibliographies by topics / Duct Fittings

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Duct Fittings'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Duct Fittings"

1

John, I. Sodiki. "Analysis of Pressure Losses in Conditioned Air Distribution: Case Study of an Industrial Cafeteria." International Journal of Engineering Works (ISSN:2409-2770) 2, no. 3 (2015): 32–41. https://doi.org/10.5281/zenodo.15965.

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<strong>Fractions of the total head loss which constitute the loss through duct fittings are calculated for various duct runs in a conditioned air distribution system of a cafeteria building project. An &lsquo;Excel&rsquo; plot shows a second order increase of the fraction from 0.70 to 0.76 for an increase in duct length from 6.2m to 22.1m. Also, an average fraction of 0.73 was obtained for an average duct length of 15.8m from the computed values. The study shows that the loss through duct fittings constitutes a major loss (being greater than 50% of the total), as corroborated by results of ea
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Shao, L., and S. B. Riffat. "CFD for prediction ofk-factors of duct fittings." International Journal of Energy Research 19, no. 1 (1995): 89–93. http://dx.doi.org/10.1002/er.4440190110.

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Stewart, Raine, and Karl Peterman. "Preliminary testing for ASHRAE research project 1919: The effects of duct size and aspect ratio on flow noise in elbows." Journal of the Acoustical Society of America 156, no. 4_Supplement (2024): A59. https://doi.org/10.1121/10.0035105.

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The goal of RP-1919 is to investigate the regenerated noise and breakout noise of elbow fittings, eventually resulting in an algorithm for a variety of flow rates that considers a duct’s size and aspect ratio. This algorithm is intended for more accurate noise prediction of elbow fittings, to better inform building design. The practical application of this project necessitates a test method that is applicable to real-world building systems. Sound intensity measurements are a logical choice to investigate the elbow fittings, with one notable challenge: differentiating airflow noise from elbow f
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Mak, C. M., D. C. Waddington, and D. J. Oldham. "The Prediction of Airflow Generated Noise in Ventilation Systems." Building Acoustics 4, no. 4 (1997): 275–94. http://dx.doi.org/10.1177/1351010x9700400404.

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At long distances from the primary noise source (the fan) of a ventilation system, airflow generated noise from duct fittings can become the major noise problem. There exists only a limited amount of measured data on flow generated noise produced by some in-duct elements such as bends and transition pieces. This lack of data reflects the difficulty in obtaining such information from conventional measurements techniques. As an alternative to large scale data collection, attempts have been made to develop pressure-based techniques for predicting the flow generated noise in a duct. In this paper
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Shao, L., and S. B. Riffat. "Accuracy of CFD for predicting pressure losses in HVAC duct fittings." Applied Energy 51, no. 3 (1995): 233–48. http://dx.doi.org/10.1016/0306-2619(95)00002-a.

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Srihari., M., Irshad Md., and Mahesh |. K. Sai Teja K. "Design of Chiller for Air Conditioning of Residential Building." International Journal of Trend in Scientific Research and Development 3, no. 3 (2019): 1246–52. https://doi.org/10.31142/ijtsrd23291.

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The main objective of the project is to design and draft a fully functional Heating, Ventilation and Air Conditional HVAC system for computer center. From residential to commercial structures such as apartments, laboratories, hospitals, etc..., can be designed with HVAC components. HVAC is used to adjust the comfort level of both ambient temperature and air humidity to feel comfortable in enclosed spaces. As we want the heating, cooling, and ventilating system to perform well, we needed to start with an efficient duct design. In this project, we designed a duct system using the protocols based
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Lukács, Eszter, and János Vad. "Parameter Study of a Loss Reducing Passive Flow Control Method in a Square-to-square Sudden Expansion." Periodica Polytechnica Mechanical Engineering 67, no. 3 (2023): 204–13. http://dx.doi.org/10.3311/ppme.22389.

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The energy consumption of mechanical ventilation in buildings needs to be reduced. An efficient way to achieve this goal is to reduce the hydraulic resistance of the ventilation duct system elements, for example, that of sudden expansions. Ventilation ducts and pipe fittings are frequently of rectangular cross-section. The present paper investigates a passive flow control method in order to reduce the loss coefficient of a square-to-square sudden expansion, where the loss-reducing appendages are short guide vanes, termed as miniflaps, placed at the step edge of the sudden expansion. The turbul
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Gao, Ran, Shikuo Chen, Angui Li, Zhigang Yang, and Beihua Cong. "Computational fluid dynamics study on the drag and flow field differences between the single and coupled bends." Building Services Engineering Research and Technology 38, no. 2 (2016): 163–75. http://dx.doi.org/10.1177/0143624416670695.

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Owing to the limited installation space and duct size, coupled fittings are common in the duct systems of buildings. The coupling effect leads to changes in drag and fan energy consumption. This study investigates duct drag and flow field characteristics under coupling conditions. Experiments and numerical simulations with the Reynolds stress model are conducted. Flow field changes, flow field deformation, and drag changes in the duct are analyzed. Regardless of the coupling form, the velocity near the inner arc is fast, whereas that near the outer arc is slow. Under three different coupling c
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Lazarevikj, Marija, Zoran Markov, and Valentino Stojkovski. "The hydraulic role of elbows in rectangular ducts of HVAC distribution systems analysed by CFD." Thermal Science, no. 00 (2025): 51. https://doi.org/10.2298/tsci241230051l.

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Ducts with rectangular cross-section are widely used in HVAC (heating, ventilation and air conditioning) distribution systems applied to residential, commercial and industrial buildings where round elements can?t be used. Usual practical problem is calculating the required pressure drop to drive the air flow for a given duct geometry at a certain flow rate, for which the total hydraulic losses should be obtained. Friction losses in ducts depend on their size, flow capacity and construction material, while minor losses are caused by changes in flow stream direction, expansions or contractions,
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Wahj, Ahmed Mohammed Mari* Prof M.N. Kareemi. "AIR CONDITIONING SYSTEM FOR MULTISTORIED RESIDENTIAL APARTMENT CONSISTING OF G+5 FLOORS." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 6 (2016): 292–97. https://doi.org/10.5281/zenodo.54793.

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This Project is about Air conditioning for 6 levels with 24 Flats. Each flat consist of different numbers of room i.e. Master Bedroom, Bedroom, and Living / Dining room. Each floor is supplied with Air Conditioning system supplied by AHU connected to chiller. &Delta;U can be calculated based on specifications of material used by the Architecture / Civil designer for the project. &Delta;T can be calculated based on specifications for material and in direction to be used i.e. North, South, East, West, North West, North East, South West, and South East. Watts per square feet can be calculated bas
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Dissertations / Theses on the topic "Duct Fittings"

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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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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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Lo, Faro Barbara. "Physical modelling of high redshift galaxy spectra: a new multiwavelenght view on galaxy formation and evolution." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423456.

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A major step forward in our understanding of the formation mechanism and evolution with cosmic time of galaxies is given by the recent development of powerful astronomical tools able to detect exceedingly faint signals from remote distances. One of the latter developments of particular signicance was the opening of wavelengths longwards the classical visual band to the astronomical observation from space. From the mid '80 with the pioneering IRAS survey, until today, with the operation of the Herschel Space Observatory in the far-infrared and the Large Atacama Millimetre Array (ALMA) in the
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Fu, Nicole Christina. "Physical Properties of Massive, Star-Forming Galaxies When the Universe Was Only Two Billion Years Old." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19956.

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Due to the finite speed of light and a vast, expanding universe, telescopes are just now receiving the light emitted by galaxies as they were forming in the very early universe. The light from these galaxies has been redshifted (stretched to longer, redder wavelengths) as a result of its journey through expanding space. Using sophisticated techniques and exceptional multi-wavelength optical and infrared data, we isolate a population of 378 galaxies in the process of formation when the Universe was only two billion years old. By matching the distinctive properties of the light spectra of the
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Books on the topic "Duct Fittings"

1

Layout for Duct Fittings (Indoor Environment Technician's Library). Leo A. Meyer Associates, 2003.

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ASHRAE. Duct Fitting Database /94601. Amer Society of Heating Refrig, 2000.

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Refrigerating and Air-Conditioning Engineers American Society of Heating. ASHRAE Duct Fitting Database CD Version 6.00.00. American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2011.

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4

bcoey. K-3 Install Sheet Metal Ducts, Fittings and Dampers. British Columbia/Yukon Open Authoring Platform, 2022.

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Method of Testing to Determine Flow Resistance of Hvac Ducts and Fittings (A S H R a E Standards, 120-1999). Amer Society of Heating, 1999.

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Book chapters on the topic "Duct Fittings"

1

Ziganshin, Arslan, and Konstantin Logachev. "Applications of Shaped Duct Fittings." In Vortex Ventilation. CRC Press, 2025. https://doi.org/10.1201/9781003632559-9.

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Helbig, Silke, and Uwe Baumann. "Acceptance and Fitting of the DUET Device – A Combined Speech Processor for Electric Acoustic Stimulation." In Cochlear Implants and Hearing Preservation. KARGER, 2009. http://dx.doi.org/10.1159/000262599.

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Wang Zheng. "Dust Particle Recognition Using ROF Model and Feature Information." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2019. https://doi.org/10.3233/978-1-61499-939-3-191.

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When explosive dust concentrations reach a certain value near an ignition source, it creates an explosion hazard. Therefore, we propose an explosive dust detection and characteristic analysis method using dust particle imagery. First, the Fourier transform domain of the fractional derivative is used to define the image filtering framework. The Rudin &amp;ndash; Osher &amp;ndash; Fatemi (ROF) model, in a bounded variation imagery function space, is selected to obtain prior noise knowledge with noise variance. Then, the imagery texture region and the nontexture region are divided according to th
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McFarland, Ben. "The Return of the Exiled Elements." In A World From Dust. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190275013.003.0014.

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The last page in a comic book is often a cliffhanger, so you’ll be more inclined to buy the next issue. It happens so regularly that as I read through the comic (yes, I still read a comic or two), I find myself trying to anticipate what kind of twist will be on the last page. The best twists are the ones you could have seen coming, but didn’t. The story in this book also has a chemical twist here, near the end. This twist is innovative, expensive, and predictable from chemistry. For this twist, the periodic table plays spoiler. Before the Cambrian explosion, hidden in the nets of signaling pro
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Conference papers on the topic "Duct Fittings"

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Jiang, Ruqi, Yongchun Liang, Xiaoyi Zhao, and Chenzhao Fu. "Fast Calculation of Transient Temperature Rise of Duct Cable Based on Fitting Function." In 2024 7th International Conference on Renewable Energy and Power Engineering (REPE). IEEE, 2024. https://doi.org/10.1109/repe62578.2024.10809705.

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Lakshmiraju, Murthy, and Jie Cui. "Laminar Pressure Loss Coefficient in Close Coupled Fittings." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15999.

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Close-coupled fittings are widely used in piping system to change the direction of the fluid and to connect pipes. These fittings cause losses and these losses play a significant role in the total pressure loss in a duct system. Numerical simulations were performed using Fluent on laminar flows in a circular pipe to obtain pressure loss coefficients associated with different fittings of two elbows and three elbows. Each configuration was studied with different intermediate distances between fittings of 0, 1, 3, 5, and 10 pipe diameters. It was observed that for a Reynolds number of 100 and for
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Sacks, M. P., J. G. Kawall, R. Behboudi, and J. Buttell. "Microphone Probe for In-Duct Measurement of Gas Turbine Exhaust Noise." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0349.

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A new probe has been developed for Bruel &amp; Kjaer 6.35 mm (1/4″) microphones in order to allow in-duct measurements in high temperature gas turbine exhaust ducts without exposing the microphone to excessive temperatures. The motivation for this design was the need for a probe system that is easily transported and installed on site. The new probe is made from readily available 6.35 mm (1/4″) o.d. tubing and compression fittings. It consists of a stem to sample the in-duct acoustic field, a shut off valve, a “T” connector to provide a microphone port remote from the hot gas and an anechoic te
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Steppert, Michael, Philipp Epple, Michael Steber, et al. "Development of a New Exhaust Air System for Combined Air Compressor and Dryer System." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5106.

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Abstract In this work a new exhaust air system for rotary screw compressors with integrated refrigeration dryers has been developed. The new system unites both, the exhaust air flow out of the compressor and out of the refrigeration drier and in such a way the overall exhaust air and hence the overall heat are exhausted through one single air duct. For the development of the system, the ASD 50 T SFC compressor system from KAESER Kompressoren SE [1] was used. Because of the slight overpressure in the exhaust air duct due to the cooling radial fan in the compressor, a jet pump was designed and p
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Munisamy, Kannan M., Mohd Zamri Yusoff, Soong Peng Soon, and Pang Win Cheong. "CFD analysis onto PU/PIR fitting in rectangular duct." In 2009 3rd International Conference on Energy and Environment (ICEE). IEEE, 2009. http://dx.doi.org/10.1109/iceenviron.2009.5398616.

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Lankalapalli, Kiran, and Stephen Idem. "Pressure Loss Coefficients for VAV Terminal Units." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23047.

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Abstract This study utilizes static pressure drop data taken from one manufacturer’s catalog to develop total pressure loss coefficient correlations for single duct VAV terminal units having a circular inlet duct and a rectangular outlet. The control dampers for each box were assumed to be in their wide open position. Separate correlations are presented for cases including a plain box, as well as terminal units that have either hot water reheat coils consisting of one to four tube rows, or an electrical heating element. In every instance the correlations account for static pressure and velocit
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Bianchi, Michele, Mustapha Chaker, Andrea De Pascale, Antonio Peretto, and Pier Ruggero Spina. "CFD Simulation of Water Injection in GT Inlet Duct Using Spray Experimentally Tuned Data: Nozzle Spray Simulation Model and Results for an Application to a Heavy-Duty Gas Turbine." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27361.

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This study describes an application of Computational Flow Dynamics (CFD) to the two-phase flow problem of water injection into a compressor inlet duct for fogging systems. The paper addresses issues related to the CFD setup and the developed spray simulation model. Water injection is simulated by fitting experimental data on sprays obtained from industrial nozzles. In particular, the initial droplets size distribution is defined in accordance with results of laboratory tests on impaction-pin type nozzles. By using a commercial CFD software, 3D numerical simulations have been carried out on a t
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Craven, Robert, Keith Kirkpatrick, and Stephen Idem. "Combustion Turbine Exhaust Duct, Silencer, and Stack Scale Modeling." In ASME 2021 Power Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/power2021-64118.

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Abstract After constructing a scale model of planned changes to a power plant exhaust system, tests were performed to measure pressure losses in the transition, silencer, and stack. A dimension of 0.30 m (1.0 ft) for the scale model corresponded to 3.7 m (12.0 ft) at full scale. To the extent possible, the scale model tests exhibited geometric similarity with the actual power plant. Total pressure loss coefficients varied between 2.122, 1.969, and 1.932, for three separate scale model configurations that were considered. A combination of turning vanes and splitter vanes in the five-gore elbow,
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Erol, Nazim, Xin Shan, and Onur Bilgen. "An Equivalent Circuit Model for the Reconfigurable Ducted Turbine Array Concept." In ASME 2022 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/smasis2022-91270.

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Abstract The reconfigurable ducted turbine array concept is an energy harvesting method proposed to reduce the so-called levelized cost of energy extracted from naturally occurring flows (e.g., from wind and water currents.) Duct augmentation is proposed to achieve higher power coefficient than the Betz limit for open turbines, among other (e.g., structural) reasons. Ducted or shrouded hydrokinetic turbines with a contracted throat area can be used to eliminate blade tip vortex, and to potentially increase the flow velocity at the rotor cross-section, consequently speeding up the rotor to impr
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Ayala, Orlando, Thurston Humphries, Tyler Youells, Jahshawn Thomas, and Manuel Ayala. "Computational Fluid Dynamics to Study the Origin of Secondary Flows in Square Ducts With Straightened Elbow Concept Governed by Artificial Body Force." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-71675.

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Abstract The 90° pipe bend is perhaps the most frequently used fitting in piping systems. The secondary flow and associated losses occurring in such bends are therefore of considerable engineering importance. However, although many investigators have studied the problem, it is still unclear how secondary flows develop, and get triggered. The curvature of the 90-degree elbow induces centrifugal force, causing the development of such secondary flow. The intensity of the secondary flow is dependent on the radius of the bend curvature (R) and Reynolds number (Re). The objective of this study is to
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