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Industrial Hygiene > Ventilation Part 2 > Flashcards

Ventilation Part 2 Flashcards

1
Q

What are the components of the LEV system, and their purpose?

A
  • Hood / exhaust grill/ return air register- air is drawn in to capture contaminant
  • Ducts - connect the components
  • Air cleaner- removes materials before discharge
  • fan and motor- provide energy to draw air through ventilation system
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2
Q

What are the three measurements to take for ventilation systems? What are the symbols?

A

Velocity (V)

Flow Rate (Q)

Pressure (SP or VP)

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3
Q

Is the velocity uniform throughout the ventilation system?

A

no

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4
Q

What is the equation for velocity?

A

Distance/ Time

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5
Q

What are the units for velocity?

A

feet per minute or meters per second

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6
Q

What tools are used to measure velocity?

A

Pitot tubes, velometer, anemometer

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7
Q

What does the flowrate measure?

A

Volume of air/ time

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8
Q

What are the units for flowrate?

A

cubic feet per minute (CFM)

Cubic meters per second (m3/s)

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9
Q

What tools are used to measure flowrate?

A
  • bubblemeter
  • DryCal
  • Rotameter
  • Critical orifice
  • mass flowrate meter
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10
Q

How many types of pressure do local exhaust systems have?

A

2

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11
Q

What are the two types of pressure in a local ventilation system?

A

Static pressure (SP) and velocity pressure (VP)

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12
Q

Describe static pressure

A

exerts pressure on the sides of the duct

  • positive on blower side of fan- pushes on the duct sides
  • negative on suction side of duct- pulls on duct side
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13
Q

Describe velocity pressure

A

result of air moving through the system

Positive sign in direction of flow

exerted by moving air in direction of air movement

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14
Q

What is the relationship between VP and V?

A

V=4005*VP^0.5

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15
Q

Can VP be negative?

A

No, VP always positive

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16
Q

What is the equation for total pressure?

A

Total Pressure = VP + SP

17
Q

What is a loss of pressure?

A

Losses or resistance in a ventilation system

18
Q

What are examples of losses?

A
  • contractions/ expansions/ bends in ductwork
  • hood and hood entries
  • turbulence
  • air cleaners
  • smokestack
19
Q

What are the devices commonly used to evaluate ventilation systems?

A 
Velometer
anemometer
pitot tube and manometer
balometer
smoke tube
20
Q

Measurements of round ducts?

A

?

21
Q

Measurements of sq/ rec ducts?

A

?

22
Q

Measurements to take in ventilation system

A

1) Hood entry velocities- entry losses
2) duct velocities- traverse
3) Duct velocity pressure- system losses
4) hood static pressure- amount of suction
5) tracers or tracer decay- complex systems

Industrial Hygiene (12 decks)

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