This technical presentation summarizes different types of fans used in mechanical engineering. It was presented by Danial Sohail, Osaid Haq, Daniyal Iqbal, and Owais Ali. The presentation describes the key types of fans like propeller, axial, forward curved blade, and backward curved blade fans. It also discusses critical parameters that affect fan performance like brake horsepower, capacity, efficiency and pressure. The optimal working conditions and proper installation of fans is emphasized. Common causes of failures in fans and blowers are also outlined.

1. Technical Presentation
Presenters:
1- Danial Sohail (ME-11089)
2- Osaid Haq (ME-11102)
3- Daniyal Iqbal (ME-11103)
4- Owais Ali (ME-11105)

2.  Delivers quantity of air or gas at a desired pressure
Fans

3. Types of Fans
Fans
Propeller
Axial
Forward
Curved Blade
Backward
Curved Blade
Radial Blade
• Light or Medium Duty Application
• Ventilation Unit
• Air can be moved in either direction
• Enclosed in Cylindrical Housing
• One way direction of air
• Used in Clean environment
• Moderate Efficiency
• Moderate Noise Level
• Used in Clean environment
• Highest Efficiency
• Lowest Noise Level
• High Temperature
• Any Environment
• Lowest Efficiency
• Highest Noise Level

4. Performance Parameters
Brake
Horsepower
Fan
Capacity
Fan Rating
Outlet
Velocity
Static
Efficiency
Static
Pressure
Tip Speed
Total
Pressure

5.  Design Speed 10 – 15% less than critical speed of fan
 Maintenance of speed and mass of rotating element
 Lack of maintenance can lead to serious damage/failure
 Stable Inlet Conditions
 Ducts should be designed to ensure:
 Adequate volume of clean air or gas
 Stable inlet pressure
 Laminar flow
 Controlled moisture, dirt content, barometric pressure, density
Optimum Working Conditions

6.  Rigid stable foundation.
 Bearing supported structure
 Leak proof, airtight minimum friction loss duct work
 Flow control devices for inlets and outlets.
Installation of Fans

7.  Delivers quantity of air or gas at a desired pressure
 Moderate to high pressure devices.
 Compression by helical lobes or screws.
Blowers

8.  Process Instability
 Start/Stop Operation
 Demand Variation
 Mechanical Failures
Causes of Failures in Blowers

9.  Fluidizers are devices to provide moderate to high pressure transfer of
non-abrasive, dry materials
Fluidizers

10.  Air Leakage
 Couplings Misaligned
 Dirt in Air
 Wrong Direction of Rotation
 Insufficient Air Suction
Causes of Failures in Fluidizers