GOVERNMENT ENGINEERING COLLEGE BHAVNAGAR PREPARED BY: AJAY VEKARIYA (130210119122) HARPAL VANAR (130210119120) MAHENDRA PARMAR (130210119080) ANIRUDDH.

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Presentation transcript:

GOVERNMENT ENGINEERING COLLEGE BHAVNAGAR PREPARED BY: AJAY VEKARIYA ( ) HARPAL VANAR ( ) MAHENDRA PARMAR ( ) ANIRUDDH SOLANKI ( ) GUIDED BY: D.J. MEHTA SIR

What is Heat Exchanger? What is Radiator? Purpose of radiator Cooling system in engine Types of flow About Radiator What is Area density?

What is Heat Exchanger? Heat exchangers is devices that are facilitate the exchange of heat between two fluids that are different temperature without mixing to each other

What is Radiator? Radiator is the application of the heat exchanger which is the part of the engine cooling system

Purpose of Radiator  Remove excessive heat produced by the engine during combustion and by friction.  4000 degree temps. could seriously damage engine parts.

Types of Cooling Systems  Air cooling system  Liquid cooling system

Air cooling system  Air Cooled engines are light and use a very simple cooling system.  Have few if any moving parts.  Require little or no maintenance.  Cannot cool as efficiently as liquid cooling systems

Liquid cooling system  Use antifreeze (a 50/50 mix of water and ethylene glycol).  This antifreeze circulates through the engine absorbing and carrying away some excess heat with it.  These systems are heavy and have many parts which require maintenance.  They cool an engine far more efficiently than an air cooling system.  Get the engine up to operating temperature faster than air cooling

 Centrifugal pump  Cooling fluid  Radiator  Fan  Thermostat System componentsFunction Cooling fluid circulation Heat transfer Heat exchange with the ambient Air through the radiator at low vehicle speed Engine temperature stabilization Cooling system in engine

Types of flow  Parallel flow  The hot fluid and cold fluids enters the same direction.  Counter flow  The hot fluid and cold fluids enters the opposite direction.  Cross flow  The hot fluid and cold fluids usually move to perpendicular to each other.

About Radiators  Allows for heat to move from coolant to the outside air.  Cooler air flowing through the radiator cools the coolant.  Most radiators about sq. feet.  Can have multiple cores to increase area.  Two types… - Cross flow - Down flow

Down flow Radiator

Cross flow Radiator

What is Area density ?  Area density(ß) is ratio of heat transfer surface area of heat exchanger to its volume.  Area density of car radiator (ß= 1000)