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Author :
Publisher :
ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.3/5 (91 download)
Download or read book Deposition of Submicron-size Particles in Ventilation Ducts written by and published by . This book was released on 1963 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mark Raymond Sippola
Publisher :
ISBN 13 :
Total Pages : 490 pages
Book Rating : 4.:/5 (34 download)
Download or read book Particle Deposition in Ventilation Ducts written by Mark Raymond Sippola and published by . This book was released on 2002 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particle Deposition in Ventilation Ducts written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In ventilation duct flow the turbulent flow profile is commonly disturbed or not fully developed and these conditions are likely to influence particle deposition to duct surfaces. Particle deposition rates at eight S-connectors, in two 90{sup o} duct bends and in two ducts where the turbulent flow profile was not fully developed were measured in a laboratory duct system with both galvanized steel and internally insulated ducts with hydraulic diameters of 15.2 cm. In the steel duct system, experiments with nominal particle diameters of 1, 3, 5, 9 and 16 [mu]m were conducted at each of three nominal air speeds: 2.2, 5.3 and 9.0 m/s. In the insulated duct system, deposition of particles with nominal diameters of 1, 3, 5, 8 and 13 [mu]m was measured at nominal air speeds of 2.2, 5.3 and 8.8 m/s. Fluorescent techniques were used to directly measure the deposition velocities of monodisperse fluorescent particles to duct surfaces. Deposition at S-connectors, in bends and in straight ducts with developing turbulence was often greater than deposition in straight ducts with fully developed turbulence for equal particle sizes, air speeds and duct surface orientations. Deposition rates at all locations were found to increase with an increase in particle size or air speed. High deposition rates at S-connectors resulted from impaction and these rates were nearly independent of the orientation of the S-connector. Deposition rates in the two 90{sup o} bends differed by more than an order of magnitude in some cases, probably because of the difference in turbulence conditions at the bend inlets. In straight steel ducts where the turbulent flow profile was developing, the deposition enhancement relative to fully developed turbulence generally increased with air speed and decreased with downstream distance from the duct inlet. This enhancement was greater at the duct ceiling and wall than at the duct floor. In insulated ducts, deposition enhancement was less pronounced overall than in steel ducts. Trends that were observed in steel ducts were present, but weaker, in insulated ducts.
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ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (871 download)
Download or read book Experiments Measuring Particle Deposition from Fully Developed Turbulent Flow in Ventilation Ducts written by and published by . This book was released on 2003 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle deposition in ventilation ducts influences particle exposures of building occupants and may lead to a variety of indoor air quality concerns. Experiments have been performed in a laboratory to study the effects of particle size and air speed on deposition rates of particles from turbulent air flows in galvanized steel and internally insulated ducts with hydraulic diameters of 15.2 cm. The duct systems were constructed of materials typically found in commercial heating, ventilating and air conditioning (HVAC) systems. In the steel duct system, experiments with nominal particle sizes of 1, 3, 5, 9 and 16 [mu]m were conducted at each of three nominal air speeds: 2.2, 5.3 and 9.0 m/s. In the insulated duct system, deposition rates of particles with nominal sizes of 1, 3, 5, 8 and 13 [mu]m were measured at nominal air speeds of 2.2, 5.3 and 8.8 m/s. Fluorescent techniques were used to directly measure the deposition velocities of monodisperse fluorescent particles to duct surfaces (floor, wall and ceiling) at two straight duct sections where the turbulent flow profile was fully developed. In steel ducts, deposition rates were higher to the duct floor than to the wall, which were, in turn, greater than to the ceiling. In insulated ducts, deposition was nearly the same to the duct floor, wall and ceiling for a given particle size and air speed. Deposition to duct walls and ceilings was greatly enhanced in insulated ducts compared to steel ducts. Deposition velocities to each of the three duct surface orientations in both systems were found to increase with increasing particle size or air velocity over the ranges studied. Deposition rates measured in the current experiments were in general agreement with the limited observations of similar systems by previous researchers.
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ISBN 13 :
Total Pages : 1242 pages
Book Rating : 4.E/5 ( download)
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1969 with total page 1242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : B. R. Fish
Publisher : Elsevier
ISBN 13 : 1483154874
Total Pages : 428 pages
Book Rating : 4.4/5 (831 download)
Download or read book Surface Contamination written by B. R. Fish and published by Elsevier. This book was released on 2016-10-27 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Contamination presents the proceedings of first International Symposium on Surface Contamination, held at Gatlinburg, Tennessee in June 1964. The meeting discusses the potential hazards brought about by noxious contaminants on surfaces; the effects of contamination to human health and safety; and the integrity of scientific and technical machinery and products in meeting the exacting requirements. The book contains the work of experts from different technical and administrative disciplines. Areas covered include fundamental research on redispersible and evaporable contamination, including radioactive, biological, chemical, and abrasive contaminants. Administrative and technical problems on radioactive surface contamination control criteria; measurement techniques; environmental control of surface contamination; dissemination of airborne microorganisms; radioactive contamination control applications; biological and chemical surface contamination; insurance and economics; and decontamination are tackled as well. The text will be a good source of information for ecologists, environmentalists, chemists, biologists, students, and policymakers.
Download or read book Modeling Particle Loss in Ventilation Ducts written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Empirical equations were developed and applied to predict losses of 0.01-100 [mu]m airborne particles making a single pass through 120 different ventilation duct runs typical of those found in mid-sized office buildings. For all duct runs, losses were negligible for submicron particles and nearly complete for particles larger than 50 [mu]m. The 50th percentile cut-point diameters were 15 [mu]m in supply runs and 25 [mu]m in return runs. Losses in supply duct runs were higher than in return duct runs, mostly because internal insulation was present in portions of supply duct runs, but absent from return duct runs. Single-pass equations for particle loss in duct runs were combined with models for predicting ventilation system filtration efficiency and particle deposition to indoor surfaces to evaluate the fates of particles of indoor and outdoor origin in an archetypal mechanically ventilated building. Results suggest that duct losses are a minor influence for determining indoor concentrations for most particle sizes. Losses in ducts were of a comparable magnitude to indoor surface losses for most particle sizes. For outdoor air drawn into an unfiltered ventilation system, most particles smaller than 1 [mu]m are exhausted from the building. Large particles deposit within the building, mostly in supply ducts or on indoor surfaces. When filters are present, most particles are either filtered or exhausted. The fates of particles generated indoors follow similar trends as outdoor particles drawn into the building.
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ISBN 13 :
Total Pages : 1162 pages
Book Rating : 4.3/5 (91 download)
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 760 pages
Book Rating : 4.3/5 (121 download)
Download or read book Air Pollution Abstracts written by and published by . This book was released on 1972-03 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : U.S. Atomic Energy Commission. Division of Technical Information
Publisher :
ISBN 13 :
Total Pages : 824 pages
Book Rating : 4.F/5 ( download)
Download or read book Reports Received by Division of Technical Information Extension written by U.S. Atomic Energy Commission. Division of Technical Information and published by . This book was released on with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particle Deposition in Ventilation Ducts written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In ventilation duct flow the turbulent flow profile is commonly disturbed or not fully developed and these conditions are likely to influence particle deposition to duct surfaces. Particle deposition rates at eight S-connectors, in two 90{sup o} duct bends and in two ducts where the turbulent flow profile was not fully developed were measured in a laboratory duct system with both galvanized steel and internally insulated ducts with hydraulic diameters of 15.2 cm. In the steel duct system, experiments with nominal particle diameters of 1, 3, 5, 9 and 16 [mu]m were conducted at each of three nominal air speeds: 2.2, 5.3 and 9.0 m/s. In the insulated duct system, deposition of particles with nominal diameters of 1, 3, 5, 8 and 13 [mu]m was measured at nominal air speeds of 2.2, 5.3 and 8.8 m/s. Fluorescent techniques were used to directly measure the deposition velocities of monodisperse fluorescent particles to duct surfaces. Deposition at S-connectors, in bends and in straight ducts with developing turbulence was often greater than deposition in straight ducts with fully developed turbulence for equal particle sizes, air speeds and duct surface orientations. Deposition rates at all locations were found to increase with an increase in particle size or air speed. High deposition rates at S-connectors resulted from impaction and these rates were nearly independent of the orientation of the S-connector. Deposition rates in the two 90{sup o} bends differed by more than an order of magnitude in some cases, probably because of the difference in turbulence conditions at the bend inlets. In straight steel ducts where the turbulent flow profile was developing, the deposition enhancement relative to fully developed turbulence generally increased with air speed and decreased with downstream distance from the duct inlet. This enhancement was greater at the duct ceiling and wall than at the duct floor. In insulated ducts, deposition enhancement was less pronounced overall than in steel ducts. Trends that were observed in steel ducts were present, but weaker, in insulated ducts.
Author :
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ISBN 13 :
Total Pages : 654 pages
Book Rating : 4.E/5 ( download)
Download or read book Air Pollution Abstracts written by and published by . This book was released on 1971-05 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 1548 pages
Book Rating : 4.F/5 ( download)
Download or read book Nuclear Safety written by and published by . This book was released on 1963 with total page 1548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sumanta K. Pal
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (359 download)
Download or read book Transport and Deposition of Submicron Aerosol Particles for Unsteady-state Flows in Pores with Application to the Lung written by Sumanta K. Pal and published by . This book was released on 1996 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Oak Ridge National Laboratory
Publisher :
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.3/5 (91 download)
Download or read book Publications, Reports, and Papers for 1961- from Oak Ridge National Laboratory written by Oak Ridge National Laboratory and published by . This book was released on 1965 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nuclear Safety Information Center
Publisher :
ISBN 13 :
Total Pages : 428 pages
Book Rating : 4.3/5 (91 download)
Download or read book Indexed Bibliography of Current Nuclear Safety Literature --15 written by Nuclear Safety Information Center and published by . This book was released on 1968 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. M. O'Hara
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.3/5 (91 download)
Download or read book Publications, Reports, and Papers for 1966 from Oak Ridge National Laboratory written by F. M. O'Hara and published by . This book was released on 1967 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
