Fans

1
Fans Lecture 2

• Fan testing

Dr. C. L. Jones Biosystems and Ag. Engineering
2
propeller fan
Axial flow fans

• tube-axial fan

vane-axial fan
Dr. C. L. Jones Biosystems and Ag. Engineering
3
centrifugal
Radial flow fans
Sukup literature
Dr. C. L. Jones Biosystems and Ag. Engineering
4
cross-flow (tangential) fans
Dr. C. L. Jones Biosystems and Ag. Engineering
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mixed-flow tubular cent. fans
Dr. C. L. Jones Biosystems and Ag. Engineering
6
Fan Curves

• AMCA Handout

Dr. C. L. Jones Biosystems and Ag. Engineering
7
Total pressure, total efficiency, static
efficiency

• Total Pressure eqn. 5.1, pg 127
• Find v eqn. 5.2
• Conversions
• 1 H2O 249 Pa
• 1 ft/min .00508 m/sec
• 1 lb/in3 27679.9 kg/m3
• 1 ft3/min .000471947 m3/sec
• 1 HP 745.7 Watts
• Total efficiency eqn. 5.3
• Static efficiency eqn. 5.4

• Assume 1750 rpm
• Outlet of 10 x 12
• Q 12030 cfm
• Static pressure 2
• 50 hp
• Density 3.9E-5 lb/in3

Dr. C. L. Jones Biosystems and Ag. Engineering