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
- Shell and Tube heat exchanger
- Plate heat exchanger
- kettle heat exchanger
- 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
Function of shell & tube heat exchanger:
-Heating(gas or liquid)
-Cooling without condensing
-Condensing of vapors(partial condensing or full condensing)
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- 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
-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
-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.