Engineering, 01.12.2020 14:00 carterhoward

Suppose to capture a particulate coming from a process requires a rate of air flow of 20 fpm. Now you have a square hood of 6 ft2 to capture the contaminant. What is the distance of the hood to capture the contaminant if the velocity of air is 190 fpm?
What is the required air flow if the hood is placed 3 ft away from the source?
In the discussion of use of settling chambers to remove large particulate from exhaust air, the addition of baffles to the chamber was described as increasing efficiency of the system. What price is paid for this addition, ignoring the cost of the baffle installation itself?
We can calculate the amount of air necessary to hold the concentration of a vapor at the legal limit. Calculate the rate necessary to vapors of methylene chloride at its TLV when
G= 8 pt/hr

SG = 1.336

K = 5

TLV = 500 ppm

What is the flow rate necessary to hold this vapor at the TLV?
What would be the rate be if the room had the twice the volume?
If we were to change room volume, perhaps by doubling the room size without changing anything else, what factor in the calculation might change to reflect this change?
Suppose the location of the fan with respect to the source of contamination were changed, what factor in the calculation might change to reflect this change?

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Suppose to capture a particulate coming from a process requires a rate of air flow of 20 fpm. Now yo...

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