Question: Why Do We Use Shell And Tube In Heat Exchanger?

How many types of heat exchangers are there?

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

What is the difference between double pipe and shell and tube heat exchanger?

Double pipe heat exchanger consists of two concentric pipes of different diameters. One pipe is for hot fluid and another is for cold fluid. … Shell and tube heat exchanger consists of a shell in which large number of parallel tubes are present. One fluid hot or cold flow in shell and other hot or cold flow in the tubes.

Where are shell and tube heat exchangers used?

The simple design of a shell and tube heat exchanger makes it an ideal cooling solution for a wide variety of applications. One of the most common applications is the cooling of hydraulic fluid and oil in engines, transmissions and hydraulic power packs.

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 calculate the efficiency of a shell and tube heat exchanger?

Shell & tube heat exchanger efficiency where, LMTD is the logarithmic mean temperature difference. In this equation only the definition of mean temperature difference has been made more specific. Otherwise, the heat transfer rate is still governed by the product – UA.

Is condenser a heat exchanger?

A condenser unit used in central air conditioning systems typically has a heat exchanger section to cool down and condense incoming refrigerant vapor into liquid, a compressor to raise the pressure of the refrigerant and move it along, and a fan for blowing outside air through the heat exchanger section to cool the …

What are the four important parts of shell and tube heat exchanger?

The shell and tube exchanger consists of four major parts:Front Header—this is where the fluid enters the tubeside of the exchanger. … Rear Header—this is where the tubeside fluid leaves the exchanger or where it is returned to the front header in exchangers with multiple tubeside passes.More items…

How do you maintain a heat exchanger?

Here are 5 proven industry practices to boost heat exchanger performance and maintain process efficiency:Online and Offline Cleaning. … Maintaining Heat Exchanger. … Periodic Cleaning. … Cleaning the PHE Manually. … Minimizing the Fouling Factor. … Analyzing and Addressing Issues in Heat Exchanger Efficiency.

What is the basic difference between 1 1 and 2/4 heat exchanger?

1–2 HX means 1 shell and 2 pass HX same with 2–4 HX as 2 shell and 4 pass. In a single shell HX the shell is horizontally divided into 2 segments where the tube inverts as a u-tube to pass from both the segments of the shell.

How does a 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.

Is boiler a heat exchanger?

No. You need heat exchanger to extract heat from boiler. Simply put, heat exchanger is a device where you just need to transfer heat from one fluid medium to anothor, whereas, Boiler is a a steam generation machines which needs bunch of heat exchanger for its operation. … So, boiler is definitely not a heat exchanger!

Why are heat exchangers important?

Heat exchangers are used either to heat or cool the oil. … The heat exchanger is designed to provide the required amount of thermal energy needed for either heating or cooling a fluid stream in the process. The rate of heat transfer is important for the selection of a particular type of heat exchanger.

What is shell and tube type heat exchanger?

The most common type of heat exchanger is the shell-and-tube type illustrated in Figure 2. It utilizes a bundle of tubes through which one of the fluids flows. These tubes are enclosed in a shell with provisions for the other fluid to flow through the spaces between the tubes.

What are the two types of heat exchangers?

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

What are the 4 types of heat transfer?

Various heat transfer mechanisms exist, including convection, conduction, thermal radiation, and evaporative cooling.

How is shell and tube heat exchanger capacity calculated?

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)

What is the most effective heat exchanger?

Plate exchanger is the most efficient due to turbulent flow on both sides. High heat-transfer coefficient and high turbulence due to even flow distribution are important. However, a plate heat exchanger regenerator is restricted to low viscosities. With high viscosities, a special tubular may be required.

What is baffle cut?

Baffle is provided with a cut (%) which is expressed as the percentage of the segment height to shell inside diameter. In general, baffle cut can vary between 15% and 45% of the shell inside diameter. This cut allows the fluid to pass through in parallel or counter flow direction.

Why multi pass heat exchanger is used?

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. Non-regenerative heat exchangers use separate fluids for heating and cooling.

How do you choose a shell and tube heat exchanger?

Selection of Exchanger GeometryTube outside diameter. For the process industry, 19.05 mm (3/4″) tends to be the most common.Tube wall thickness. Reference must be made to a recognized pressure vessel code to decide this.Tube length. … Tube layout. … Tube pitch. … Number of tube passes. … Shell diameter. … Baffle type.More items…

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.