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Informationen zum Autor WILLIAM A. BURGESS is Associate Professor of Occupational Health Engineering, Emeritus, at the Harvard School of Public Health. He is the 1996 recipient of the Donald E. Cummings Memorial Award of the American Industrial Hygiene Association, and the author of Recognition of Health Hazards in Industry (Wiley). MICHAEL J. ELLENBECKER is Professor of Industrial Hygiene in the Department of Work Environment at the University of Massachusetts Lowell and the Director of the Toxics Use Reduction Institute. A Certified Industrial Hygienist, Dr. Ellenbecker received his ScD in environmental health sciences from Harvard. ROBERT D. TREITMAN, a graduate of Brown University and the Harvard School of Public Health, has done extensive research and consulting in industrial hygiene and indoor air pollution. He is currently Vice President and co-owner of Softpro, Inc., in Waltham, Massachusetts. CONTRIBUTORS-Professor Michael Flynn, University of North Carolina at Chapel Hill, has contributed a chapter introducing the application of computational methods to the study of ventilation. Martin Horowitz, an industrial hygiene pr actitioner at Analog Devices, has presented an overview of the techniques for the identification and control of contaminant reentry. Klappentext The second edition of Ventilation Control of the Work Environment incorporates changes in the field of industrial hygiene since the first edition was published in 1982. Integrating feedback from students and professionals, the new edition includes problems sets for each chapter and updated information on the modeling of exhaust ventilation systems, and thus assures the continuation of the book's role as the primary industry textbook.This revised text includes a large amount of material on HVAC systems, and has been updated to reflect the changes in the Ventilation Manual published by ACGIH. It uses both English and metric units, and each chapter concludes with a problem set. Zusammenfassung The second edition of Ventilation Control of the Work Environment incorporates changes in the field of industrial hygiene since the first edition was published in 1982. Inhaltsverzeichnis List of Units xiii Preface xv 1 Ventilation for Control 1 1.1 Control Options 2 1.2 Ventilation for Control of Air Contaminants 3 1.3 Ventilation Applications 5 1.4 Case Studies 7 1.5 Summary 9 References 11 2 Principles of Airflow 12 2.1 Airflow 13 2.2 Density 13 2.3 Continuity Relation 14 2.4 Pressure 16 2.4.1 Pressure Units 16 2.4.2 Types of Pressure 17 2.5 Head 18 2.6 Elevation 20 2.7 Pressure Relationships 22 2.7.1 Reynolds Number 24 2.8 Losses 26 2.8.1 Frictional Losses 26 2.8.2 Shock Losses 28 2.9 Losses in Fittings 30 2.9.1 Expansions 30 2.9.2 Contractions 32 2.9.3 Elbows 35 2.9.4 Branch Entries (Junctions) 36 2.10 Summary 38 List of Symbols 38 Problems 39 3 Airflow Measurement Techniques 43 3.1 Measurement of Velocity by Pitot-Static Tube 45 3.1.1 Pressure Measurements 47 3.1.2 Velocity Profile in a Duc 50 3.1.3 Pitot-Static Traverse 57 3.1.4 Application of the Pitot-Static Tube and Potential Errors 60 3.2 Mechanical Devices 61 3.2.1 Rotating Vane Anemometers 61 3.2.2 Deflecting Vane Anemometers (Velometer) 68 3.2.3 Bridled Vane Anemometers 71 3.3 Heated-Element Anemometers 72 3.4 Other Devices 75 3.4.1 Vortex Shedding Anemometers 75 3.4.2 Orifice Meters 76 3.4.3 Venturi Meters 76 3.5 Hood Static Pressure Method 77 3.6 Calibration of Instruments 79 3.7 Observation of Airflow Patterns with Visible Tracers 80 3.7.1 Tracer Design 81 3.7.2 Applicatio...
