By William A. Burgess
Specified assurance of either theoretical and useful points of commercial air flow systems––newly up to date during this moment variation
Designed for use with the ACGIH commercial air flow handbook, air flow for keep watch over of the paintings atmosphere explains the explanation of the fabric inside the guide whereas demonstrating either the theoretical and useful elements of the topic. The layout of neighborhood exhaust air flow platforms is illustrated by means of examples taken from the authors’ business adventure. furthermore, end-of-chapter challenge units are actually provided to augment the content material of applicable chapters. either English and metric devices are utilized in this re-creation, and new air flow practices and learn advances are famous all through this significant revision.
subject matters lined contain:
- Overview of business exhaust air flow and its influence
- 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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Extra resources for Ventilation for control of the work environment
There is a reduction in the cross-sectional area of the duct on the intake side of the fan, where the static pressure would be negative (with respect to ambient). Assuming that the only losses in the system are due to friction and ignoring the losses associated with the shock in the abrupt reduction, the graphical representation of the pressures in the system is as shown. While the static and total pressures drop through the system, the velocity pressure remains constant within each section. The increase in velocity pressure at the transition from the larger section to the smaller section results from the change in velocity, which is a function of the ﬂow Q and the duct area A.
The advantage of the inclined manometer is its simplicity and the fact that it can be constructed in the laboratory from standard glass tubing and a wooden wedge. The diﬃculty encountered in its use is the problem in leveling the two legs and ensuring a 10 : 1 inclination plane. The commercially available single-leg, inclined manometer is a solution to the diﬃculties encountered with the double-leg, inclined manometer described above. In this unit, one leg is replaced by a ﬂuid reservoir, while the reading leg is a takeoﬀ from the reservoir (Fig.
This ﬂuid has an additional advantage in that a well-deﬁned meniscus is formed and the ﬂuid “clears” or seeks a stable reading quickly. For high-pressure measurements, for example, those made on high-velocity/low-volume systems where total and static pressures are encountered in the range of 1–10 in. 4 cm Hg), an electronic transducerbased instrument is appropriate. Any change in manometer ﬂuid must be noted so that the subsequent pressure readings can be adjusted for density. 5 (a) Inclined manometer.