Why do we use shell and tube in heat exchanger?

Shell and tube Heat Exchangers have the ability to transfer large amounts of heat in relatively low cost, servicable designs. They can provide large amounts of effective tube surface while minimizing the requirements of floor space, liquid volume and weight.

What is the use of tube sheet in heat exchanger?

Tube Sheet – The tube sheet is used to support and isolate the tubes within a shell and tube heat exchanger. Baffles – Baffles are plates that direct shell fluid flow around the tube bundle to promote heat transfer.

Why a large number of tubes is used in heat exchangers?

The fluids can be either liquids or gases on either the shell or the tube side. In order to transfer heat efficiently, a large heat transfer area should be used, leading to the use of many tubes. In this way, waste heat can be put to use. This is an efficient way to conserve energy.

What are the different kinds of tubes used in heat exchangers?

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.

Why are shells and tubes better?

Advantages of Shell and Tube Heat Exchangers; Smaller designs can be lower cost. Much easier to service. O Ring seals also make them cheap to service. A better solution for sea water coolant, or other fluids at risk of clogging in narrow spaces.

Why shell and tube heat exchanger is used in oil refinery?

In heat exchanger, Shell and tube heat exchanger is the most utilizable exchanger which used for transfer the heat from one medium of fluid by another fluid medium through convection. In oil & gas refinery, exchange of heat is very necessary to complete the process to produce desired product in a safe manner.

What is the function of tube sheet?

A tube sheet is usually made from a round flat piece of plate,sheet with holes drilled to accept the tubes or pipes in a accurate location and pattern relative to one another. The tube sheets are used to support and isolate tubes in heat exchangers and boilers or to support filter elements.

What is Kern method?

methods is the well-known Kern method, which was an attempt to correlate data. for standard exchangers by a simple equation analogous to equations for flow in. tubes. However, this method is restricted to a fixed baffle cut (25\%) and cannot. adequately account for baffle-to-shell and tube-to-baffle leakages.

Why counter flow heat exchanger is preferred over parallel flow?

Counter Flow Heat Exchanger The diagram above shows a Shell and Tube Heat Exchanger. In the counter flow setup, the fluids are travelling along the heat exchanger in opposite directions.

How many tubes does a heat exchanger have?

In Power plant 500-1000 MW or more turbine hot well surface condenser are available more than 10,000 Number of tubes. waste heat boiler in power plant gas turbine are shell & tube type heat exchanger are also larger size and having 5000-12000 number of tubes.

Why plate heat exchanger is better than shell and tube heat exchanger?

Plate heat exchangers are up to five times more efficient than shell-and-tube designs with approach temperatures as close as 1°F. Heat recovery can be increased substantially by simply exchanging existing shell-and-tubes for compact heat exchangers.