Archive for November, 2012

Heat Exchangers

November 15th, 2012

In accordance with the concept of the flow arrangement, there are two main classifications
of the heat exchangers. The first kind is known as the parallel flow heat exchangers. In these cases, the entrance of the fluids within the exchangers occurs at the same time. The second important kind of heat exchanger is known as the counter exchangers. The entrance of the fluids in the exchangers is in the opposite direction. This is an important example of one of the most efficient heat exchangers. One of the main facts based on which this kind of heat exchanger is most efficient is that the transfer of heat from the medium to the space is efficient. In this case, the difference of an average temperature between the environment and the medium is lesser. The third kind is known as the cross flow heat exchanger. The fluids in the case of this heat exchanger travel in an opposite direction to each other.

For increased efficiency, it is important that the surface area of wall between the two fluids
is increased for maximum heat exchange. With the help of the material chosen for the heat exchanger, the resistance of flow can be reduced. The heat exchangers can be used for many purposes and these include residential as well as industrial purposes. It has been seen that in the presence of fins or any kind of corrugations can reduce the efficiency of the heat exchangers. These are the fins or corrugations that increase turbulence by often increasing the surface area.

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Shell and Tube Heat Exchanger

November 11th, 2012

systems. The water is converted into steam. This steam is an important source of energy required to drive turbines. The typical and most commonly used shell and tube heat exchanger is based on 1 to 4 pass designs on the side of the tubes. The pass designs refer to the repetition of times the fluid passes through the tubes as well as over the shells. When the shell and tube heat exchanger is single pass, fluid enters the tube and comes out of the shell.

The advantages offered by the shell and tube exchanger are numerous. Power plants use single pass design shell and tube heat exchangers. Two and four pass shell and tube exchanger is also used at an industrial scale. An important advantage offered by these exchangers is an easier and timely construction.There is one variety of the shell and tube heat exchanger having baffles with the help of which the flow of the liquid is directed from the sides of the shell. In this model, the fluid does not have to take a short cut by leaving the shell side that makes the volume flow lower as well as ineffective. The baffles are attached to the tube bundles instead of the shell so that in case of maintenance, there is no need of removing the bundle. The ease is the main factor that carries more weightage as compared to the heating advantages.

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