The cooling system serves to remove excess heat from the engine through combustion and friction. It works to quickly bring the engine up to optimal operating temperature and maintain it there. There are two main types - air cooling, which radiates heat through fins to the atmosphere, and liquid/water cooling, which circulates coolant through water jackets and a radiator. Water cooling cools more uniformly and improves fuel efficiency but requires more components and depends on the water supply. The main components of a water cooling system are the radiator, water jackets, water pump, and thermostat.
2. Purpose of the
Cooling system
• Remove excessive heat produced
by the engine during combustion
and by friction.
• Get the engine up to operating
temperature as quickly as possible.
• Maintain the engine at its’
optimum operating temperature.
• Engines only turn about 33% of the
heat produced during the
combustion process into usable
energy.
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4. Air cooling
• In this type of cooling system, the heat, which
is conducted to the outer parts of the engine,
is radiated and conducted away by the stream
of air, which is obtained from the atmosphere.
5. Dependency of Air cooling
The total area of the fin surfaces,
The velocity and amount of the
cooling air
The temperature of the cooling
air.
6. Advantage and disadvantage of air
cooling
• Air Cooled engines are light and use a very
simple cooling system.
• Coolant or antifreeze solution are not required
• Require little or no maintenance.
• Cannot cool as efficiently as liquid cooling
systems
7. Water cooling
It serves two purposes in the working of an
engine:
a) It takes away the excessive heat generated in
the engine and saves it from over heating.
a) It keeps the engine at working temperature
for efficient and economical working
8. Advantage and disad. Of water cooling
• Uniform cooling of cylinder, cylinder head and
valves.
• Specific fuel consumption of engine improves.
• Engine is less noise as compare to air cooled
engine.
• More component in water cooled engine
make it costly.
• Depends on supply of water.
10. Radiators
• A radiator is a heat
exchanger.
• Tube and fin style
the most popular.
• Made of copper and
brass or aluminum
and plastic.
• 3 (radiator,
evaporator, heater
core)
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11. Water jackets
• Surrounds the
cylinders with water
passage.
• Absorbs heat from
the cylinder wall.
• Pump move water to
radiator where heat
is exchanged to the
air.
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12. Water Pump
• Non-positive
displacement pump
which circulates
coolant around cooling
system.
• Simple impeller design.
• Usually driven by drive
belt from crankshaft.
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