What Are The Four Important Parts Of Shell And Tube Heat Exchanger?

How do you calculate the overall heat transfer coefficient for shell and tube heat exchanger?

1/U = 1/h****o + (r****o – ri)/k + 1/h****i (Note that the thickness of the tube wall, ro – ri, is represented by the symbol ΔXw in the diagram at the right.) This equation gives an estimate for the overall heat transfer coefficient, U, for a new heat exchanger, or one with newly cleaned heat transfer surfaces..

What is a Tubesheet?

In tube-shell exchangers, tube sheets are plates that are perforated with a pattern of holes designed to accommodate pipes. They support and isolate tubes in the tube-shell exchangers or in boilers. Therefore, they come in different sizes and number of holes. Moreover, they support filter elements.

How does shell and tube heat exchanger work?

As its name implies, this type of heat exchanger consists of a shell (a large pressure vessel) with a bundle of tubes inside it. One fluid runs through the tubes, and another fluid flows over the tubes (through the shell) to transfer heat between the two fluids.

What are the two types of heat exchangers?

There are two main types of regenerative heat exchangers—static heat exchangers and dynamic heat exchangers.

How many types of exchangers are there?

There are two main types of regenerative heat exchangers—static heat exchangers and dynamic heat exchangers.

What is h in heat transfer?

The approximate rate of heat transfer between the bulk of the fluid inside the pipe and the pipe external surface is: where q = heat transfer rate (W) h = convective heat transfer coefficient (W/(m2·K)) t = wall thickness (m) k = wall thermal conductivity (W/m·K) A = area (m2) = difference in temperature.

Shell and tube heat exchangers are the most common kind of heat exchangers used in the cooling of both liquids and gasses. They thank their popularity to their design flexibility allowing a wide variety of temperatures, pressures and mediums used.

What is the most effective heat exchanger?

In counter-flow heat exchangers the fluids enter the exchanger from opposite ends. The counter current design is the most efficient, in that it can transfer the most heat from the heat (transfer) medium per unit mass due to the fact that the average temperature difference along any unit length is higher.

How do I choose a heat exchanger?

The following criteria can help in selecting the type of heat exchanger best suited for a given process:Application (i.e. sensible vapor or liquid, condensing or boiling)Operating pressures & temperatures (including startup, shutdown, normal & process upset conditions)More items…

How do you find the area of a shell and tube heat exchanger?

4.0 – HEAT EXCHANGERS CALCULATIONS:The main basic Heat Exchanger equation is: Q = U x A x ΔTm =The log mean temperature difference ΔTm is: ΔTm =(T1 – t2) – (T2 – t1) = °F.T1 = Inlet tube side fluid temperature; t2 = Outlet shell side fluid temperature;ln (T1 – t2) (T2 – t1)

How do you calculate the efficiency of a shell and tube heat exchanger?

The efficiency of heat exchanger is ratio of actual temperature drop to the maximum temperature drop.

What is a floating head heat exchanger?

In a Floating Head Heat Exchanger, one end of the tubesheet is fixed to the shell, while the other one can “float” freely inside the shell. … They are recommended in place of fixed plate heat exchanger for high pressure and temperature operation.

How does a baffle work?

Baffles work by disrupting the flow pattern and providing top to bottom flow. … By ensuring that top to bottom flow is achieved in addition to swirling flow, baffles are able to prevent this from happening.

What baffle means?

verb (used with object), baf·fled, baf·fling. to confuse, bewilder, or perplex: He was baffled by the technical language of the instructions. to frustrate or confound; thwart by creating confusion or bewilderment. to check or deflect the movement of (sound, light, fluids, etc.). to equip with a baffle or baffles.

What are the parts of a heat exchanger?

The Major Components of Heat ExchangersThe Tubes. Tubes are perhaps the most important component of a heat exchanger. … Front and Rear Headers. The front and rear headers of heat exchangers are where the liquid enters and leaves the tubes. … Transfer Line Exchangers. … The Air Cooling System. … Why Heat Exchange Is Necessary.

How do you choose a shell and tube heat exchanger?

Tips on Selection of Shell and Tube Heat ExchangersMeasurement of Heat Load. … Levelling-Off Temperature. … Natural Radiation Cooling. … Estimating Heat Load. … Maximum Heat Exchanger Capacity. … Heat Generation in the System. … HP = GPM × PSI ÷ 1,714.Cooling Water.More items…

What is a baffle cut?

A segment, called the baffle cut, is cut away to permit the fluid to flow parallel to the tube axis as it flows from one baffle space to another. Segmental cuts with the height of the segment approximately 25 percent of the shell diameter are normally the optimum.

What is the use of baffle?

Baffles are flow-directing or obstructing vanes or panels used in some industrial process vessels (tanks), such as shell and tube heat exchangers, chemical reactors, and static mixers. Baffles are an integral part of the shell and tube heat exchanger design.

What is a tube sheet in a heat exchanger?

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.

Why do we use shell and tube in heat exchanger?

Why are Shell and Tube Heat Exchangers Used? Shell and tube heat exchanger is used in various industrial process applications because they can perform tasks such as: Removal of process heat and feed water preheating. Cooling of hydraulic and lube oil.

How many tubes are in a tube and shell heat exchanger?

9600 tubesCan a heat exchanger contain 9600 tubes? It is a shell and tube heat exchanger.