1. The document discusses a hydraulically driven engine cooling fan system that is becoming more common to reduce noise in construction equipment. 2. It describes the functions of cooling fans to circulate air through the radiator and release engine heat, and compares mechanical and electrical fan types. 3. The document outlines factors to consider when selecting a cooling fan, including capacity, airstream properties, physical limitations, noise levels, and safety accessories. It then discusses how thermal clutch fans work to efficiently cool engines.

1. EAB 2603
POWER SYSTEM
COOLING FAN SYSTEM
NAME MATRIC NO.
MUHAMMAD ARIFF BIN ISA S16945
MOHD FAIZOL HAFFIZ BIN ABD RAZAK S17061
NORHIDAYAH BINTI MALAHUBBAN S17730
NUR SURAYA FITRI BINTI PIRDAUS S17921
MACLESTER ANAK ENTALAI S18167
Diploma in Agricultural Engineering Semester 4
2nd Semester Session 2013/2014
Lecturer: MR. LING JEN UNG

2. INTRODUCTION
• Recently a hydraulically driven engine cooling fan is
becoming a mainstream technology as one of the
means to bring down the level of noises generated by
construction equipment
• However, the currently available system is no better
than a small combination of various general purpose-
devices such as a hydraulic pump and motor and
valves

3. Function of cooling fan
• The cooling fan circulates air through the radiator
so it can release engine heat into the surrounding
air.
• With the introduction of fan clutches and electric
cooling fans, fans have become more efficient by
operating only when they need to.
• Electric cooling fans also improve the operation of
the air conditioning system.

4. Types of Fan
1. Mechanical fan
• Mechanical fan is also called belt drive
• Mechanical fans are still used on some cars and light
trucks
• These fans now use a temperature-sensitive fan
clutch that allows the fan to disengage and engage
according to different operating conditions

5. Advantages Disadvantages
Cheap Speed ratio is not constant
(slip & stretch)
Allows misalignment
(parallel shafts)
Heat accumulation
Protects from overload Speed limited – 2000 m/min
Absorbs noise and vibrations Power limited – 700 kW
Cushion load fluctuations Endless belts needs special attention
to install
Needs little maintenance
High efficiency (90-98%, usually 95%)

6. 2. Electrical fan
• Electrical fans are powered by
vehicle’s electrical system
• More efficient alternative to
mechanical fans

7. Advantages Disadvantages
Consistent cooling Expensive
Reduced water pump wear Multiple fan used for better control
Multiple sizes and configurations
Can fit in the radiator
Have adjustable thermostat that
can operate from the driver’s seat
Versatility

8. FACTORS CONSIDERATION
FOR FAN SELECTION

9. • Flow rate based on system
requirements. Expressed as actual
cubic feet per minute (acfm).
• Pressure requirement based on system
pressure requirements. Expressed as
FSP or FTP in inches of water gauge.
1. CAPACITY
• Material handled through fan.
• Explosive or flammable material.2. AIR STREAM
• Performance requirements
• Inlet size and location
• Fan weight
3.PHYSICAL
LIMITATIONS

10. • Generated by turbulence within he fan housing.
• “White” noise which is a mixture of all
frequencies is mostly produced.
• Radial blade fans produce a pure tone at a
frequency BPF
• BPF = rpm * n * CF.
4.NOISE
• Safety guards are required at inlet, outlet,
shaft, drive and cleanout doors.
• Accessories help in future maintenance
requirements.
• Flow control can be done using dampers.
5.
SAFETY
AND
ACCESSO
RIES

11. How Cooling Fan Work?
• A thermal clutch fan operates using silicon fluid
as a viscous coupling medium.
• When the clutch is cool and disengaged, most of
the silicon fluid is stored in the reservoir allowing
your fan clutch to slip relative to your water
pump shaft thereby spinning at a lower RPM
than the water pump.

12. Continue…
• This saves your money because the horsepower from
your engine is not wasted driving a clutch fan when it's
not needed.
• As your engine heats up, the thermal spring on the front
of the clutch expands, which opens a valve allowing the
silicon fluid to drive your clutch at an increased RPM.
• This provides more air flow through your radiator,
preventing your car from overheating.

14. INNOVATION FOR COOLING
FAN SYSTEM
 Structure of in-fan mounted motor
 Built in control valve
 High working efficiency
 Wide variation in combination of pump and
motor components
 Reversing fan rotating

15. CONCLUSION
• A hydraulically driven engine cooling fan system is
becoming more essential for lowering noises
generated by construction equipment
• It seems the fan system will remain as effective as
ever in the future since people will further intensify
attention to the issue of protecting the global
environment