William A. Burgess's Ventilation for control of the work environment PDF

By William A. Burgess

ISBN-10: 047109532X

ISBN-13: 9780471095323

Distinct assurance of either theoretical and sensible points of business air flow systems––newly up-to-date during this moment version

Designed for use with the ACGIH business air flow guide, air flow for keep an eye on of the paintings atmosphere explains the reason of the fabric inside the guide whereas demonstrating either the theoretical and useful facets of the topic. The layout of neighborhood exhaust air flow platforms is illustrated by way of examples taken from the authors’ business adventure. moreover, end-of-chapter challenge units are actually provided to enhance the content material of applicable chapters. either English and metric devices are utilized in this re-creation, and new air flow practices and examine advances are famous all through this significant revision.

issues coated contain:

  • Overview of commercial exhaust air flow and its effect
  • Fluid mechanics
  • Methods and instrumentation for measuring airflow
  • Hood layout, choice, and function
  • The layout of neighborhood exhaust air flow structures
  • Fan layout and function
  • Air-cleaning units
  • Computational fluid dynamics
  • Dealing with the reentry of exhausted air

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Example text

Tapered expansions are used to reduce the extent of the shock by decreasing the flow separation and improve the efficiency of the static pressure regain. The pressure losses in tapered expansions are dependent on the angle of the expansion as well as the ratio of the initial and final cross-sectional areas. A table of values for the static regain in tapered expansions is provided in the Ventilation Manual, Fig. 5-18. 2 Contractions A duct contraction, like an expansion, can be either sudden or gradual, with the latter being more efficient (Fig.

The pressure losses in tapered expansions are dependent on the angle of the expansion as well as the ratio of the initial and final cross-sectional areas. A table of values for the static regain in tapered expansions is provided in the Ventilation Manual, Fig. 5-18. 2 Contractions A duct contraction, like an expansion, can be either sudden or gradual, with the latter being more efficient (Fig. 11). When the cross-sectional area decreases, the velocity (and the velocity pressure) must increase in accordance with the continuity relation.

A modified ellipsoidal nose was designed by the UK National Physical Laboratory to eliminate these effects while reducing the impact on the k factor from small changes in the nose profile due to manufacturing variations and damage during use. This new design, called the modified ellipsoidal Pitot–static tube, is now specified in the British Standards (BSI, 1992) while the hemispherical design continues to be the standard in the United States (ASHRAE, 2001). 10 m) in the air positioning the Pitot–static tube for the traverse and attempting to read an inclined manometer in a poorly illuminated background.

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Ventilation for control of the work environment by William A. Burgess


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