Submitted to: Mr. Surendra Saini

Lecturer (Dairy & Food Sci. Engg.)

College of Dairy & Food Sci. Technology

Udaipur

Submitted by: Reena Chittora

II Semester (Dairy & Food Sci. Engg.)

College of Dairy & Food Sci. Technology

Udaipur

Introduction: Heat ExchangerA 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. They are widely used in Space Heating, Refrigeration, Air Conditioning, Power Plants, Chemical Plants, Petro-chemical Plants, Petroleum Refineries, and Natural Gas Processing. One common example of a heat exchanger is the Radiator in a car.

The mechanical design of a heat exchanger depends on the operating pressure and temperature .

Application of Heat ExchangerHeat exchange is used every where around the human and it surroundings like human itself use heat transfer in daily use. Heat exchangers are used in many industries, some of which include:

Waste water treatment,Refrigeration systems, Wine-brewery industry, Petroleum industry, In aircraft industry to make the aircraft cool

during the flights.

Classification: Heat Exchanger(According to way of heat transfer)

Direct Contact Type Heat ExchangerStream Heat ExchangerStream Influence Heat Exchanger

Indirect Contact Type Heat ExchangerTubular Type Heat Exchanger

Double Pipe Heat Exchanger Shell & tube Heat Exchanger Spiral Heat Exchanger Cracked Surface Heat Exchanger

Plate Heat ExchangerJacked & Kettle Heat Exchanger

Direct Contact Heat ExchangerIn Direct Contact type of heat Exchanger heat is

directly transferred between Hot and Cold fluids.There is no separating wall between the hot and cold

fluids.Most direct contact heat exchangers fall under the Gas-

Liquid category, where heat is transferred between a gas and liquid in the form of drops, films or sprays.

Properties of both fluids, such as viscosity, thermal conductivity, density, specific heat and reaction on the metal in contact are essential to determine the pumping, thermal requirement and material construction.

Indirect Contact Heat ExchangerIn an Indirect Contact Type Heat Exchanger, the

fluid stream remains separated. There is separating wall between the hot and cold fluids.

The heat transfer in this type of heat exchanger takes place continuously through a dividing wall.

Most indirect contact heat exchangers fall under those gases and liquids that are soluble in nature.

Difference between Direct and Indirect Heat Exchanger

Direct Heat Exchanger Indirect Heat Exchanger

Not have a separating wall between two fluids.

Have a separating wall between two fluids.

Mostly used for those gases and liquids that are not soluble in nature

Used for those gases and liquids that are soluble in nature.

Mostly use drops and steam for heat transfer

There is no use of steam and drops

Stream Heat ExchangerSteam heat exchanger uses steam to

exchange the heat. This type of heat exchanger first convert fluid

into steam and then passes this steam through pipes.

Put some more text here related to topic….

Stream Influence Heat ExchangerReena put here some thing related to Steam

influence heat exchanger… for your books… if possible then make points. Otherwise text will be okay.

Tubular Heat ExchangerThis type of heat exchanger are categorized in following types:-Double Pipes heat ExchangeShell & Tube Heat ExchangerSpiral Heat Exchanger Cracked Surface Heat Exchanger

Shell and Tube Heat ExchangerShell 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. A set of tubes is called the tube bundle and can be made up of several types of tubes: plain, longitudinally finned.

Plate Heat Exchanger

Plate heat exchanger uses plates to exchange the heat. This the most common and popular method that is used in most common devices to keep the device cool.

Jacketed & Kettle Heat ExchangerIn this type of heat exchanger, the liquid to be heated is contained in a vessel with an agitator to stir the liquid across the heat transfer surface .It is a batch type equipment. Steam or hot water may be used as heating medium. Generally, steam is allowed to condense in the jacket. Care is to be taken so that there is minimum incorporation of air with the steam and that steam should not be in super heated state.When heating is done by hot water, it can either be spread on the outer surface of the hemispherical container or flooded into the heating/ cooling medium passage. The former method is more efficient, as the transfer of heat is faster due to rapid moving thin film or heating medium.

Any Query ???

Thank You…Reena Chittora