Ventilation

Question 0

Pressure in fluid flow through conduits

Answer 0

TP=SP+VP
TP: total pressure
SP: static pressure
VP: velocity pressure

Question 1

Volumetric Flow Rate

Answer 1

Q=V*A
Q: volumetric flow rate
V: velocity of flow
A: cross sectional area

Question 2

Velocity & Velocity Pressure

Answer 2

V = 4005 * sqrt(VP)
V: velocity, ft/minute
VP: velocity pressure, in-water

Question 3

Affinity Laws

Answer 3

AKA fan laws
Q(1)/Q(2) = N(1)/N(2)
H(1)/H(2) = (N(1)/N(2))^2
HP(1)/HP(2) = (N(1)/N(2))^3
Q: flow rate @ RPM
H: head developed in the fluid
HP: horsepower
N: fan (impeller) speed, RPM

Question 4

ERPG-1

Answer 4

Max airborne concentration below which 1 hr exposure wo more than mild, transient health effects

Question 5

ERPG-2

Answer 5

Max airborne exposure below which for 1 hr wo irreversible or other serious health effects

Question 6

ERPG-3

Answer 6

Max airborne concentration below which for up to 1 hr wo life-threatening health effects

Question 7

Hood Entry Coefficient

Answer 7

C = sqrt(VP/SP)

Question 8

Frictional Losses in Piping

Answer 8

P(d) = (4.52Q^1.85) / (C^1.85 * d^4.87)
P(d): frictional pressure loss in psi/ft
Q: flow rate
d: pipe diam, in
C: coefficient of friction