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27 Cards in this Set
- Front
- Back
One of the laws of physics states that the mass of a closed system will remain constant.
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Conservation of Mass
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All changes must be accounted for as air flows from one point to another.
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Conservation of Energy
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Inside the diameter or dimension?
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Duct Area
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What is expressed as the Q or cubic feet per minute?
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Air Flow Volume
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What is potential energy of the ventilation system?
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Static Pressure
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What pressure is exerted by a fluid in motion?
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Velocity Pressure
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Which type of pressure carries the sign of SP (either positive or negative) and measures the energy content of the air stream?
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Total Pressure
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What dictates the Q system must pull (key parameters of the design)?
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Capture Velocity
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What is the measurement of air at the opening of a local exhaust capture hood?
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Face Velocity
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What is the amount of air required to keep a contaminant entrained throughout the system?
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Transport Velocity
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What term is defined as the air being drawn into the hood, which captures, contains, or controls the emission source?
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Inlet
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The_____carries the contaminant to the air cleaner and then to the outside environment.
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Duct
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The_______scrubs, seperates, removes, or filters the contaminant from the air.
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Air Cleaner
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The______generates static pressure and moves the air.
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Fan
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The______disperses the remaining air contaminants into the outside environment.
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Outlet
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One of the main components you need to calculate when determining the effectiveness of a ventilation system is the_________?
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Duct Area
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What is related to the average velocity and the flow cross-sectional are by Q=AV
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Air Flow Volume components
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There are various methods for moving air in a ventilation system, the fan is often called the______of the system?
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Heart
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Static pressure is the____________of the ventilation system?
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Potential Energy
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Velocity pressure is the pressure_______by air in motion.
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Exerted
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Total Pressure is simply the______of the static and velocity pressures at a given point in the duct.
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Sum
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Which pressure loss has to do with entry of air into the hood or opening?
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Pressure loss
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Four major factors contribute to__________: duct material, air velocity, duct diameter, and duct length.
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Friction Loss
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Air entering a duct suffers from a great deal of_______?
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Turbulence
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What is the point where the air stream diameter is at its smallest point?
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Vena Contracta
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Adequate make-up air is too often neglected when_________is considered.
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Local Exhaust Ventilation
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____________is critical to functioning of large- volume systems.
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Make up Air
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