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| Topic: |
Technology
|
| Number of pages / Number of words: |
3 / 767 |
Essay's paper body
However, excessive face velocity can also cause the possibility
of contaminant carry out from turbulence at the worker/airflow interface.
5. A 4 foot wide exhaust hood has a moveable sash, open at a height of 1 foot, and a fan exhausting a constant volume of 600 cfm of air. You require an exhaust air velocity of 200 fpm in order to ensure that no hazardous vapours escape from the hood, how you would accomplish this...
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You require an exhaust air velocity of 200 fpm in order to ensure that no hazardous vapours escape from the hood, how you would accomplish this. (4 marks)
Solution:
Q=VA
Q1= V1 A1; Q2= V2 A2 ; V1 A1 = V2 A2
A=4*1=4ft2
600.
V1 = 4 = 150fpm
Q 600
A2= V2 = 200 = 3ft2
A2 3
H= W= 4 = 0.75ft
In order to follow the requirement of an exhaust air velocity of 200 fpm to ensure that no hazardous vapours escape from the hood, I would accomplish this by adjusting the height of the sash by 0...
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