Automobile Cooling System

8/11/2019 Automobile Cooling System

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Necessity

To remove the cylinder wall heat.

To prevent preignition of charge.

To prevent burning of the lubricants.

To do away with possible seizure of the piston.


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Extent of Cooling

It must be optimal


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Methods of Cooling

Air Cooling

Water Cooling

Liquid Cooling

Air Cooled Engine

AirCylinder Barrel

Baffle

Air

Fin

Air

Short BaffleNormal Baffle Complete Baffle


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Advantages and Disadvantages of Air

Cooled Engines

Advantages

Lightness

Operability at extreme

conditions

Easier Maintenance

Early Warm up

Disadvantages

Difficulty in maintaining even

cooling

Less efficient cooling

Bulky fan

More noisy

Air DuctAir

LongitudinalFins

Crankcase


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Pump Circulation System

Pump is used for thecirculation of coolingwater.

A fan is employed toassist the air flow.

Filler Cap

Header

Tank

Collector

Tank

Radiator

Cooling

Air

Engine

Hose Pipe

Water

Pump

Fan


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Components of Water Cooling System

Radiator

Thermostat

Pump

Fan

Hose

Heater (Auxiliary)


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RadiatorFunctions:

A radiator is a type of heat exchanger.

to transfer heat from the hot coolant to air blownthrough it.

Construction:

Basically it consists of two tanks, a top and abottom tank,

Finned tubes located in the core of the radiator

Components: Header Tank

Core

Lower Tank

Overflow Pipe Tank

Cap


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Radiator Components


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ThermostatFunctions:

To block the coolant flow to the radiator

To allow the coolant flow to the radiator

To regulate the engine temperature.

Types:

Bellows or Aneroid type

Wax or Hydrostatic type


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Bellows Type Thermostat

Components

Bellows

Valves

Valve

Water

Bellows


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Wax ThermostatPlunger

Components:

Copper Loaded Wax

Rubber Plunger

Seal

RubberPlug

CopperLoaded

Wax


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Water PumpFunctions:

The pump circulates fluid whenever theengine is running.

Components:

Belt connected to the crankshaft of theengine.

Hoses


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Fan-Functions & ComponentsFunction:

To drive the airflow through the radiator

Components:

A Fan

Drive Mechanism (Belt drive)

Arrangements:

Mounted on the water pump shaft (rear wheel drive).

Thermostatic control,flexible fan blades, variable angles ofblades and different number of blades.

Independently mounted fans (in front wheel drive cars),Electrical and Thermostatic Control.


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Fan-Illustrations

Battery

Fuse Box

MainSwitch

FanFan

Motor

Radiator FanThermo Switch

Fan


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HosesFunction:

To carry hot and cold streams ofliquid to the radiator and the engine

channel.

The interconnecting hoses fromradiator to engine and from engine to

cabin heater and back again are veryspecial.

Construction:

Radiator to engine hoses - metal coil

reinforced hoses

The bottom hose

Hose clamps

Hose PipeHose Clamp


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HeaterFunctions:

Act as a secondary cooling system

It is not an electric heater


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Other Methods of Cylinder Cooling

Liquid Cooling

Pressure Sealed Cooling


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Coolant

113 C / 235 F106 C / 223 F100 C / 212 FBoiling Point

-55 C / -67 F-37 C / -35 F0 C / 32 FFreezing Point

70/30

C2H

6O

2/Water

50/50

C2H

6O

2/Water

Pure Water


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Automobile Cooling System

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