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The velocity head at the discharge of the ventilation system. Throughout
the system, the velocity head changes with each change in duct area or
number and is a function only of the velocity of airflow. It is not a head
loss. The velocity head for the system must technically be counted a loss,
because the kinetic energy of the air is discharged to the atmosphere and
wasted. Therefore, it must be considered a loss to the system in
determining overall energy loss. Hartman, 2
Source:
Dictionary of Mining, Mineral, and Related Terms
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