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2 TRG-TRC013-EN
notes
period one
Fan Performance
Compared to compressors, the pressures generated by these air-moving
devices within the ductwork of HVAC systems are relatively small. The
measurement of these pressures is, however, essential to the determination of
fan performance.
One instrument that is available to measure these small pressures is a U-tube
that contains a quantity of water. One end of the tube is open to the atmosphere
(open leg), while the other end is connected to the ductwork (closed leg).
Air Conditioning Fans
period one
Figure 3
Measuring Pressure
atmospheric
atmospheric
pressure
pressure
duct
duct
pressure
pressure
Figure 4