Cooling fan system (presentation)

EAB 2603POWER SYSTEM

COOLING FAN SYSTEM

NAME MATRIC NO.MUHAMMAD ARIFF BIN ISA S16945

MOHD FAIZOL HAFFIZ BIN ABD RAZAK S17061

NORHIDAYAH BINTI MALAHUBBAN S17730NUR SURAYA FITRI BINTI PIRDAUS S17921

MACLESTER ANAK ENTALAI S18167

Diploma in Agricultural Engineering Semester 42nd Semester Session 2013/2014

Lecturer: MR. LING JEN UNG

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

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.

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

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%)

2. Electrical fan

• Electrical fans are powered by

vehicle’s electrical system

• More efficient alternative to

mechanical fans

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

FACTORS CONSIDERATION FOR FAN SELECTION

• 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

• 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

ACCESSORIES

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.

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.

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

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