As was discussed before, heat exchanger are equipment used for heat transfer between two fluid flows with different temperatures. In design of heat exchangers such as double pipe heat exchanger, shell & tube heat exchanger, etc., it must be noted that there are some factors that affect the heat transfer rate during the equipment operation period. One of the most important factors is called fouling.
Chemical Engineering AppSuite HD is a free chemical engineering app introduced for Apple iPad and iPhone. Using this freeware, you can find specification of materials, steam pressure and temperature data, thermodynamic and fluid dynamics tools and many more …. This app is free and available on itunes.
Heat exchanger calculator is a program written for shell and tube and double pipe heat exchanger. The full version software costs 89 USD, but the demo version works well, except you can change the shell or tube fluid flow rate. You can use this software to do your heat exchanger calculations easily and freely. More free chemical engineering software will be added soon.
Natural gas, a mixture of light hydrocarbons has clean burning characteristics led to increment of its use in vehicles as a clean fuel. Natural gas contains mostly methane and ethane. These light gases have very high vapor pressure at ambient temperature and their storage require high pressure compression or reduction of temperature extremely.
I want to introduce a package for drawing chemical structures i.e. ACD/ChemSketch. You can draw chemical structures including organics, organometallics, polymers, and Markush structures by this software. It is also possible to calculate molecular properties with this software. You can view the structures in 2D and 3D views. Another important thing is that this software is FREE . . .
In the 2nd part of this article, the calculation of convective heat transfer coefficient was explained. In a double pipe heat exchanger the internal and external heat transfer coefficients are different and it is required to use an overall heat transfer coefficient to perform the calculations.
As was mentioned before, UC, is defined as follows based on convection heat transfer coefficients:
Foot finger has some lines and this view under microscope is amazing. Below we have provided finger skin microscope photo both at 100x and 300x zoom. The lines are those which makes the finger prints.
In the first part of this article, heat exchanger design basics were introduced. In the following article, the design formulations and calculations are introduced.
As mentioned in part 1, overall heat transfer in heat exchanger in increased in the flow are set to be countercurrent. As a result, only countercurrent double pipe heat exchanger design is discussed here. To start the design of a double pipe heat exchanger, the first step is to calculate the heat duty of the heat exchanger. It must be noted that for easier design, it’s better to ignore heat loss in heat exchanger for primary design. The heat duty can be defined as the heat gained by cold fluid which is equal to the heat loss of the hot fluid. It can be calculated as:
Reciprocating compressor is the earliest compressor type with wide range of application from consumer to industrial usages. These compressors are manufactured in the broad range of configurations and the pressure range is wider than other types of compressors beginning from vacuum to 40000 psig. Higher maintenance cost and lower capacity of reciprocating compressors in comparison with centrifugal compressors have reduced the population of this type since late 1950s to the mid-1970s. But recent rises in energy cost and the advent of new specialty process plants have given the reciprocating compressors a more prominent role in the design of new plants.
Compressors are mechanical devices used to increase the pressure of gas or vapor to be transferred from one point to another through a pipe.