The document discusses different types of heat exchangers. It begins by defining a heat exchanger as a device that transfers heat from one medium to another. It then provides examples of applications of heat exchangers in various industries. The document goes on to classify heat exchangers as either direct contact or indirect contact types, and lists examples of each type such as tubular, shell and tube, plate, and jacketed & kettle heat exchangers. It provides brief descriptions of some of these types.

1. 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

7. 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

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

12. 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.

13. Jacketed & Kettle Heat Exchanger In 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.

14. Any Query ??? Thank You… Reena Chittora