| Shell And Tube Heat Exchanger |
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| chemical engineering | |
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| mechanical engineering | |
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Two fluids, of different starting temperatures, flow through the exchanger. One through the tubes and the other through the shell. Heat is transferred from one fluid to the other. In this way, waste heat can be put to use. This is a great way to conserve energy. There can be many variations on the shell and tube design. Most are either 1, 2, or 4 pass designs. This refers to the number of times the fluid in the tubes passes through the fluid in the shell. In a single pass heat exchanger, the fluid goes in one end and out the other. Two and four pass designs are common because the fluid can enter and exit on the same side. This makes construction much simpler. Counter current heat exchangers are most efficient because they allow the highest Log Mean Temperature Difference between the hot and cold streams. Many companies however do not use them because they can break easily in addition to being more expensive to build. Often multiple heat exchangers can be used to simulate the counter current flow of a single large exchanger. See also |
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