This document summarizes the key characteristics and types of engine cooling systems. It discusses that a cooling system works to keep an engine from getting too hot or cool by removing about 30% of the heat generated. There are two main types: liquid cooling systems, which circulate coolant around the engine to absorb heat via convection, and air cooling systems, which use fins and airflow to directly cool the engine. The document outlines the components and functioning of both liquid and air cooling systems, and notes some advantages and disadvantages of each type.

1. BY
INDRANIL MANDAL
ASSISTANT PROFESSOR
DEPARTMENT-MECHANICAL ENGINEERING
IDEAL INSTITUTE OF ENGINEERING

2.  It is a system which is used to keep engine from getting not
too hot and at the same time not to keep it too cool either.
Reasons for Cooling:
 To promote a high volumetric efficiency.
 To ensure proper combustion.
 To ensure mechanical operation.
INTRODUCTION

3.  It should be capable of removing about 30% of heat
generated in the combustion chamber while maintaining
the optimum temperature of the engine under all operating
conditions of the engine.
 It should remove heat at a faster rate when engine is hot.
CHARACTERISTICS OF AN EFFICIENT COOLING SYSTEM

4.  Liquid cooling (or indirect cooling) system.
 Air cooling (or direct cooling) system.
TYPES OF COOLING SYSTEM

5.  A liquid (coolant) is circulated around the cylinders and
absorb heat from the cylinder walls, Valve ports and
cylinder head.
 It takes the heat by convection process
 Coefficient of heat transfer is higher in liquids
 Coolant is a mixture of water and antifreeze. (Normally
40/60 mixture)
 Antifreeze-kerosene, wood alcohol, glycerin, sugar
solution etc.
LIQUID COOLING SYSTEM

6. COOLING WATER PASSAGES

7.  This cooling system has four types of systems:
(i) Thermosyphon system,
(ii) Evaporative cooling system,
(iii) Pump/forced circulation system and
(iv)Pressure cooling system
TYPES

8. THERMOSYPHON SYSTEM

9. PUMP/FORCED CIRCULATION SYSTEM

16. EVAPORATIVE COOLING SYSTEM

17. PRESSURE COOLING SYSTEM

18. AIR COOLING (OR DIRECT COOLING) SYSTEM –COOLING FINS

19. BAFFLES

20. ADVANTAGES:
(a) Radiator/pump is absent hence the system is light.
(b) In case of water cooling system there are leakages, but in this case
there are no leakages.
(c) Coolant and antifreeze solutions are not required.
(d) This system can be used in cold climates, where if water is used it may
freeze.
DISADVANTAGES:
(a) Comparatively it is less efficient.
(b) It is used in aero planes and motorcycle engines where the engines are
exposed to air directly.
ADVANTAGES & DISADVANTAGES OF AIR-COOLED SYSTEM

21. ADVANTAGES:
(a) Uniform cooling of cylinder, cylinder head and valves.
(b) Specific fuel consumption of engine improves by using water cooling
system.
(c) If we employ water cooling system, then engine need not be provided at
the front end of moving vehicle.
(d) Engine is less noisy as compared with air cooled engines, as it has water
for damping noise.
DIS ADVANTAGES:
(a) It depends upon the supply of water.
(b) The water pump which circulates water absorbs considerable power.
(c) If the water cooling system fails then it will result in severe damage of
engine.
(d) The water cooling system is costlier as it has more number of parts. Also it
requires more maintenance and care for its parts.
ADVANTAGES & DISADVANTAGES OF WATER COOLED SYSTEM

22. THANK YOU