What is Shell pass and tube pass?

Most shell-and-tube heat exchangers are either 1, 2, or 4 pass designs on the tube side. This refers to the number of times the fluid in the tubes passes through the fluid in the shell. In a single pass heat exchanger, the fluid goes in one end of each tube and out the other.

What is tube pass?

The tubes are arranged within the shell and tube heat exchangers in passes. The passes can be One, Two, Four, Six or Eight. This arrangement can be illustrated in the figure below: Two tube passes.

What is pass in heat exchanger?

Single-pass heat exchangers have fluids that pass each other only once. Multi-pass heat exchangers have fluids that pass each other more than once through the use of U tubes and baffles. Regenerative heat exchangers use the same fluid for heating and cooling.

What is shell side pass?

The shell-side fluid is limited to one pass within one shell and this type of exchanger is known as a 1-2 exchanger. Fixed Head 1 – 2 Exchanger. In this exchanger the tubes are held in tube sheets (one each end) and these tube sheets are fixed to the shell.

What is a shell and tube heat exchanger used for?

Shell and tube Heat Exchangers represent the most widely used vehicle for the transfer of heat in industrial process applications. They are frequently selected for such duties as: Process liquid or gas cooling. Process or refrigerant vapor or steam condensing.

What is the purpose of a shell and tube heat exchanger?

Shell and tube heat exchangers make it possible to pump materials as soon as possible, and they transfer temperatures efficiently so you can ensure the materials are at the necessary temperature without expending extra energy to do so.

What is number of tube passes in heat exchanger?

The tube passes vary from 1 to 16. The tube passes of 1, 2 and 4 are common in application. The partition built into exchanger head known as partition plate (also called pass partition) is used to direct the tube side flow.

What is shell and tube evaporator?

The main function of Shell & Tube Type Evaporator is to act as a heat exchanger in a vessel form. This is mainly done to cool closed circuit for re-circulating fluid flow. The refrigerants passed through the expansion device that passed into tubes and evaporates to produce a cooling effect.

What is tube in tube heat exchanger?

The equipment consists of a single tube mounted inside an outer shell tube, so that the product medium flows counter-current through the inner tube, with the service medium around it. The unit features a fully welded construction with a bellow-on-shell tube to absorb thermal expansion.

What is the advantage of shell and tube heat exchanger?

Advantages and disadvantages of shell-and-tube heat exchangers 1. The advantages of the devices are: Internal reliability. Shell-and-tube heat exchangers are more resistant to scale formation, which implies that cleaning should be done less frequently than with other heat exchangers.

Which industries use shell and tube heat exchangers?

Shell and tube heat exchangers are the most widely used heat exchanger type in a number of different industries….Where are the Shell and Tube Heat Exchangers Used?

• Power Generation.
• HVAC.
• Marine Applications.
• Pulp and Paper.
• Refrigeration.
• Pharmaceuticals.
• Air Processing and Compressor Cooling.
• Metals and Mining.

What are types of shell and tube heat exchanger?

The three flow types of shell and tube heat exchangers are parallel, counter, and cross. The design, operation, and applications necessitate the three flow types be used in combinations. Parallel flow is when the shell and tube sides enter the heat exchanger at the same end and flow directly to the opposite end.

How many passes are there in a shell and tube heat exchanger?

Shell-and-tube heat exchangers can have multiple passes, such as 1-1, 1-2, 1-4, 1-6, and 1-8 exchangers, where the first number denotes the number of the shells and the second number denotes the number of passes. An odd number of tube passes is seldom used except the 1-1 exchanger. A 1-2 shell-and-tube heat exchanger is illustrated in Figure

What is the difference between 1 shell pass and 2 tube pass?

1 shell pass and 2 tube pass .1 shell pass means ,the shell side fluid enters at one side and it leaves through the other side.inlet and outlet of shell side fluid will be at opposite positions.this will be the same in the case of odd shell pass 3,5, etc

What is the structure of a heat exchanger?

The structure consists of large pressure vessel – the shell and within this shell there are bundle of tubes. So, when fluids of two different temperatures are passed through the exchanger, one flows through the tubes (tube side, the tube pass) and the other flows outside the tubes but within the shell (shell side, the shell pass).

What is a baffle in a shell and tube heat exchanger?

Baffles are installed in the shell of the shell and tube heat exchanger to create more turbulence and increase the flow time so that better heat exchange is possible. Baffles support the tubes so that damage and vibration of tubes are minimized.