Heat Exchanger

Amitesh.KumarGau-c-10/L-193

Introduction

Heat exchangers are devices in which heat is transferred between two fluids at different temperatures without any mixing of the fluids.

Heat exchanger are classified on the basis of --

• Transfer process• Number of fluids• Surface compactness• Construction • Flow arrangement• Heat transfer mechanisms

Types of Heat Exchangers

On the basis of transfer process:-• Direct transfer type Or Recuperating

exchanger.• Storage type Or Regenerating

exchanger.• Direct contact type Or Direct contact

exchanger.

Direct transfer type of heat exchanger is one in which the cold and hot fluids flow simultaneously through the device and heat is transferred through a wall separating the fluids.

Concentric tube Heat Exchanger

Concentric tube Heat Exchanger

Storage type/Recuperating Exchanger

• Storage type heat exchanger is one in which the heat transfer from the hot fluid to the cold fluid through a coupling medium in the form of a porous solid matrix. The hot and cold fluids flow alternately through the matrix,

the hot fluid storing heat in it and the cold fluid extracting heat from it.

Single Matrix Storage type Heat Exchanger

Direct Contact type

Direct contact type heat exchanger is one in which the two fluids are not separated. If heat is to be transferred between a gas and a liquid, the gas is either bubbled through the liquid or the liquid is sprayed in the form of droplets into the gas.

Direct contact type heat exchanger

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