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An exhaust fan in a building should be able to move 6
Chapter 4, Problem 179EUP(choose chapter or problem)
Problem 179EUP
An exhaust fan in a building should be able to move 6 lbm/s of air at 14.4 psia, 68 F through a 1.4-ft-diameter vent hole. How high a velocity must the fan generate, and how much power is required to do that?
Questions & Answers
QUESTION:
Problem 179EUP
An exhaust fan in a building should be able to move 6 lbm/s of air at 14.4 psia, 68 F through a 1.4-ft-diameter vent hole. How high a velocity must the fan generate, and how much power is required to do that?
ANSWER:
Solution 179 EUP
Step 1 of 4
We have to find the velocity of air generated by the fan and the power required by the fan do generate that velocity.
The velocity of air generated by the fan can be found using an expression for the mass flow rate of air.
Where,
mass flow rate of air
= 6 lbm/s
Area of vent hole in ft2
V = velocity of air in ft/s
specific volume of air in ft3/lb