Quick Answer: What Are Shell And Tube Heat Exchangers Used For?

How does a plate and frame heat exchanger work?

Plate Heat Exchanger Working Principle.

A plate exchanger consists of a series of parallel plates that are placed one above the other so as to allow the formation of a series of channels for fluids to flow between them.

The space between two adjacent plates forms the channel in which the fluid flows..

Why are the most efficient heat exchangers made up of many metal plates rather than pipes?

Flat plate heat exchangers are extremely compact since they are made of small plates and not long pipes, as is the case with tube and shell heat exchanger. In addition, since the plates are usually brazed and not welded, the cost of manufacturing is significantly lower.

How are heat exchangers classified?

Starting with a definition, heat exchangers are classified according to transfer processes, number of fluids, degree of surface compactness, construction features, flow arrangements, and heat transfer mechanisms.

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.

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 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 types of heat exchangers are there?

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

What advantages does the plate heat exchanger have over the tube in tube heat exchanger?

Save energy 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.

What are heat exchangers used for?

A heat exchanger is a system used to transfer heat between two or more fluids. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact.

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…

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.

Which type of heat exchanger has more heat transfer for the same area?

Now for same mass flowrate and same inlet and outlet conditions of temperature the LMTD OF COUNTER FLOW HEAT EXCHANGER WILL BE MORE COMPARED TO PARALLEL FLOW HEAT EXCHANGER as the flow is in opposite direction. Hence the area for counter flow heat exchanger will be LESS compared to parallel flow heat exchanger.

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.

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.

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…

What are the 4 types of heat transfer?

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

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

ΔTm = Log mean temperature difference (°C) (°F). And: Ct = Liquid specific heat, tube side (kJ/kg°K) (Btu/lb°F); Cs = Liquid specific heat, shell side (kJ/kg°K) (Btu/lb°F).