Prepared by :-
Naimish hingu

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COOLING SYSTEM OF I.C. ENGINE
INTRODUCTION
I.C. Engine converts fuel energy into mechanical energy by combustion of fuel inside the cylinder.
During this high amount of heat is produced.
Working of cooling system is to take care of produced heat to operate engine.
NECESSITY OF COOLING
The engine runs best when its coolant is about 200 degrees Fahrenheit (93 degrees Celsius). At this temperature:
The combustion chamber is hot enough to completely vaporize the fuel, providing better combustion and reducing emissions.
The oil used to lubricate the engine has a lower viscosity (it is thinner), so the engine parts move more freely and the engine wastes less power moving its own components around.
Metal parts wear less.
NECESSITY OF COOLING
If engine temperature rise, then :
Strength of material decrease with increase in temperature.
Expansion of parts on high temperature.
Pre-ignition and detonation.
Property of lubricant may change on high temperature.
TYPES OF COOLING SYSTEM
Air cooling system
Water cooling system.
AIR COOLING SYSTEM
The engine block is covered in aluminum fins that conduct the heat away from the cylinder. A forced air passes over these fins, which cools the engine by transferring the heat to the air.
WATER COOLING SYSTEM
The cooling system on water-cooled, circulates a fluid through pipes and passageways in the engine. As this liquid passes through the hot engine it absorbs heat, cooling the engine. After the fluid leaves the engine, it passes through a heat exchanger, or radiator, which transfers the heat from the fluid to the air blowing through the exchanger.
WORKING OF WATER COOLING SYSTEM
PARTS OF WATER COOLING SYSTEM
Water pump
Radiator
Fan
Thermostat
Pipes.
Pressure cap
WATER PUMP
RADIATOR AND FAN
THERMOSTATE
PRESSURE CAP
TYPES OF WATER COOLING SYSTEM
Thermo-syphon cooling
Forced or pump cooling
Cooling with thermostatic regulator
Pressurized water cooling
Evaporative cooling