Heat Exchanger : Shell and Tube Heat Exchanger Definition and their parts

shell & tube heat exchanger

DEFINITION OF HEAT EXCHANGER

Heat exchanger is a device for transferring heat from one medium to another medium.

In other words we can also defined ” it is device which is transferring heat from solid medium to fluid medium”.

TYPES OF HEAT EXCHANGER

  1. Shell and Tube heat exchanger
  2. Plate heat exchanger
  3. kettle heat exchanger
  4. Re boiler

shell and tube heat exchanger:

  • U tube heat exchanger
  • Fixed tube sheet heat exchanger
  • Floating head type heat exchanger
  • Pipe in pipe heat exchanger
  • Fin fan type exchanger
Heat exchanger

Shell and tube heat exchanger

 

Function of shell & tube heat exchanger:

-Heating(gas or liquid)

-Cooling without condensing

-Condensing of vapors(partial condensing or full condensing)

-Evaporating

you can also read this:http://mechmaintenance.com/strength-material-theory-of-column/

 

CONSTRUCTION DETAILS

  • Shell side: shell, shell covers, shell nozzles
  • Tube side: Tube sheet, Tubes, Baffles, Tie rods, Spacers, Impingement plate, Channel shell, Channel cover, Tube side nozzles.
  • Non-pressure attachments: Saddles, Structural

Basic component of shell & tube heat exchanger

  • Tubes

-Provides the heat transfer area

-Bare tubes or finned tubes

-seamless or welded

  • Tube sheet

-Holds the tubes in place

-Tubes expended or welded on the tube sheets

  • Tube side nozzles & channel

-Controls the flow of the tube side fluid

-Normally of same material as that of tube & tube sheet or are cladded.

  • Channel covers

-Round plate bolted to the channels and can be removed for tube inspection

  • Shell & shell side nozzles

-It is a container for shell side fluid.

-shell side nozzles are inlets and outlet for shell side fluid.

-It is normally circular in cross section.

-It is made by rolling of plates or pipes.

  • Impingement plate

-Provided at shell inlet nozzle to avoid impact of fluid on the top row of the tubes.

  • Pass partition plate

-Provided in channel or bonnet for increasing the number of tube passes

  • Baffles

-Provide support to the tubes during assembly and operation and prevent vibration of the tubes.

-Guide the shell side fluid flow resulting in increased turbulence and heat transfer coefficient.

-For liquid flows baffle cut is approx 20 to 25% of shell diameter.

-For gaseous flow baffle cut is 40 to 45% of shell diameter.

 

 

 

 

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