Major Functions of Static Pressure LEV System and Velocity Pressure Questions . 1
What are two major functions of static pressure? Please explain where static pressure losses
occurs in the LEV system?
What are the basic components of local exhaust ventilation? Please briefly explain the
primary function(s) of each component?
If the conversion efficiency of SP to VP in the LEV system is less than 100%, there will
Use you own words to discuss why and how energy losses occur in local exhaust ventilation
system. At least 4 factors need to be discussed
Review ABIH 9-e table, and use your own words to describe how changes in curvature (R/D) and the transition
(pieces) of round elbow can affect the loss factor K
What is the 90-degree elbow loss factor (K elbow) where the elbow radius of curvature is
R/D = 1.0 in a smooth transition elbow?
We have discussed several different losses including duct friction loss, elbow loss and branch
entry loss. Why these losses are the square function of velocity (V^2)?
If the duct diameter, air temperature and humidity are same throughout a LEV system, you
perform the SP and VP measurements at two different points (#1 and 2) of the duct: At a
point (#1) of the upstream of air cleaner you get SP1 and VP1, and at another point (#2) of
the downstream of air cleaner (but before fan) you have SP2 and VP2. Please determine the
following relationship between two values using the symbol > (greater than), = (equal), or
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