Heat Transfer (2151909)

Presented By:Upadhyay Ayush. (150123119053)

Presentation On:- Heat Exchanger

GANDHINAGAR INSTITUTE

OF

TECHNOLOGY

Introduction

• A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. The media may be separated by a solid wall, so that they never mix, or they may be in direct contact.

• They are widely used in petroleum refineries, chemical plants, petrochemical plants, natural gas processing, refrigeration, power plants, air conditioning and space heating.

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Classification

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According to Heat Exchanger

Processes

Direct Contact Type

Non-Direct Contact Type

Recuperators

Regenerators

1)

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According to direction of fluid

motion

Parallel FlowCounter

FlowCross Flow

2)

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3)According to mechanical design

Concentric Tubes

Finned TubeMultiple shell & Tube passes

Compact Shell & Tube

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According to Physical state of

fluid

Condensor Evaporator

4)

Types of Heat Exchangers

• Shell and Tube Heat Exchanger.

• Plate Heat Exchanger.

• Adiabatic Wheel Heat Exchanger.

• Plate Fin Heat Exchanger.

• Pillow Plate Heat Exchanger.

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Shell & TubeHeat Exchanger

• Shell and tube heat exchangers consist of a series of tubes.

• One set of these tubes contains the fluid that must be either

heated or cooled. The second fluid runs over the tubes that

are being heated or cooled so that it can either provide the

heat or absorb the heat required.

Plate Heat Exchanger

• Plate Heat Exchanger is composed of multiple, thin, slightly

- separated plates that have very large surface areas and

fluid flow passages for heat transfer.

• This stacked-plate arrangement can be more effective, in a

given space, than the shell and tube heat exchanger.

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Adiabatic Wheel Heat Exchanger.

• Adiabatic Wheel heat exchanger uses an intermediate fluid

or solid store to hold heat, which is then moved to the other

side of the heat exchanger to be released.

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Plate Fin Heat Exchanger

• Plate Fin heat exchanger uses "sandwiched" passages

containing fins to increase the affectivity of the unit.

• The designs include cross flow and counter flow coupled

with various fin configurations such as straight fins, offset

fins and wavy fins.

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Pillow Plate Heat Exchanger

• A pillow plate exchanger is commonly used in the dairy

industry for cooling milk in large direct-expansion stainless

steel bulk tanks.

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Applications

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• Heat Exchangers prevent car engine overheating

and increase efficiency

• Heat exchangers are used in many Industries Like,

Oil & Gas , Chemical Processing , Power

Generation , etc. for heat transfer.

• Heat exchangers are used in AC and furnaces.