Heat exchanger

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VIVEKANAND INSTITUTE OF TECHNOLOGY & SCIENCE(GZB)

SEMINAR- 2008-09PRATEEK SHARMAMECHANICAL ENGINEERING- 3rd Year.

INTRODUCTION

HEAT EXCHANGER

TOPIC OF DISCUSSION Heat Exchanger Classification of heat Exchangers Acc. To Type of flow Acc. To construction Acc. To no. of passes How it works ? Maintenance Examples of heat exchanger

HEAT EXCHANGER - INTRODUCTION

A heat exchanger is a device built for efficient heat transfer from one medium to another, whether the media are separated by a solid wall so that they never mix, or the media are in direct contact

Classification of Heat Exchanger

Acc.to type of flowParallel flow H.E.Counter flow H.E.Cross flow H.E.

Acc.to type Construction

Acc.to No.of Passes Single pass H.E.Multipass H.E.

WORKING 1> Entry of Both the fluids in H.E. 2> Extraction of Heat from hot fluid to cold fluid. 3> Rise in Temp. of cold fluid & fall in temp. of hot fluid 4> Both fluids exit from their respective outlets

MAINTENANCE Due to presence of impurities in the fluids

certain depositions occur inside the tubes of the heat exchanger which is known as FOULING . This reduces the heat transfer between the fluids and hence the efficiency.

For removing these scales the heat exchangers are cleaned periodically

Examples of Heat Exchanger

RADIATOR CONDENSER

ECONOMISER SUPERHEATER

AIR PREHEATER RECUPERATOR

THANK YOU

Heat exchanger

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