Right-click on Non-isothermal flow, go to Heat transfer and add a Temperature boundary. In the temperature field, type in T_water, then rename Temperature 1 as Temperature water. From the selection list choose Inlet water and in the expression field enter p then click on the evaluate button to see the average inlet water pressure. Though fouling should be avoided, it will inevitably happen sooner or later. Once again, add a third material by opening the material browser and adding Structural steel. From this graph you can see where the most critical areas in terms of mesh resolution are located. In the model library go to Heat Transfer Module, then Heat exchangers, and open the “shell and tube heat exchanger geometry. The first fluid, in this case water, is passed through the tubes, while the second fluid, air, circulates within the shell of the heat exchanger but outside of the tubes. From the Boundary Selections, list choose Outlet water, then rename Outflow 1 as Outflow water. The concept used to design a shell and tube heat exchanger is examined by exploring the working model of a straight, cross-flow, one pass shell and tube heat exchanger. When that happens, you may need to replace the corroded parts of the exchanger. Putting them on the shellside can maximize heat exchange efficiency. From the plane list, choose zx-planes as the plane of symmetry. Physical:611 North Road, Medford, WI 54451, different materials of construction for the tubes and the shell. Find this and similar models in the model gallery, at comsol.com/models. our website http://www.lordfintube.com. Please note that it takes about 3 hours to compute the model with an average computer containing 12 Gigabytes of free memory. This further supports putting them on the shellside as a way to minimize the drop, but also necessitates some careful considerations. Under the Built In tab, choose Air and add the material to the model. Multiscale Modeling in High-Frequency Electromagnetics, © 2020 by COMSOL Inc. All rights reserved. Right-click on Non-isothermal flow and go to Heat Transfer and choose the boundary condition Highly Conductive Layer. Now rename Outlet 1 as Outlet water. It is important to balance between accuracy and computational cost in order to ensure the most accurate solution in a timely manner. Choose boundary as the geometric entity and from the selections list choose Inlet air. Design A Shell & Tube Heat Exchanger On Ms Excel - posted in Process Heat Transfer: I am new to this website, I wanted to share a few spreadsheets, dont know whether this where I should share the file or not. The location for each makes a big difference in the effectiveness of heat transfer, maintenance needs and the cost of the exchanger and any replacements. Replacing the shell often means replacing the whole exchanger. Both of these fluids have different starting temperatures when entering the heat exchanger, however after circulating within the shell and tubes, the fluids are brought closer to an equilibrium temperature. Again, right-click on Non-isothermal flow and add a k-epsilon turbulent outlet. Corroded tubes are easier to replace than a corroded shell. Now that we have validated the model, let us analyze the temperature distribution along all of the wall boundaries. Rename Outlet 2 as Outlet air. Right-click on Streamline 1 and choose Color Expression. In this example, two fluids are passed through the heat exchanger. You should take the same thoughtful deliberation when deciding which fluid to put on the shellside and which to allocate to the tubeside. You can download the shell and tube heat exchanger model from the model gallery, and use the preprocessed model to follow along with the steps described in the video. Now, right-click on definition, go to model couplings and select Integration. Of course, this depends on the heat exchanger design. As such, allocating your highest pressure fluid to tubeside can help keep exchanger costs down. Shell and tube heat exchangers are one of the most widely used type of heat exchanger in the processing industries (65% of the market according to H. S. Lee’s book, Thermal Design) and are commonly found in oil refineries, nuclear power plants, and other large-scale chemical processes. From the boundary selection list, choose Inlet air and in the expression field, type in P. Now, click the evaluate button to see the average inlet air pressure. From the Selections list choose Walls and change the layer thickness to 5 millimeters. Now, right-click on Inlet 1 and rename it as Inlet water. From the Selection List, choose Outlet air and Normal Stress as the Boundary Condition. Click plot to view the temperature distribution along the new surface. This website uses cookies to function and to improve your experience. Hello, The video below shows the basic steps for setting up a simulation of a shell and tube heat exchanger, including the selection of a suitable turbulence flow model, assigning temperature and pressure dependent materials, setting up inlet and outlet boundary conditions, defining heat conductance using the Highly Conductive Layer feature, and other steps.