![]() The shell side fluid is the process fluid that is required to be heated to a certain temperature setpoint. To develop a comprehensive control strategy for any control loop, it’s important to identify the process variable of interest-called the "controlled variable," the manipulated variable, and the different disturbance variables that directly affect the controlled variable.Ĭonsider the heat exchanger shown in Figure 3. To transfer heat efficiently, many tubes are used, which increases the heat-transfer surface area between the two fluids. Fluids can be liquids or gases on either the shell or the tube side. Heat is transferred from the tube fluid to shell fluid to remove heat, or from the shell fluid to the tube fluid to heat the material inside. Heat is transferred from one fluid to the other through the walls of the tubes.
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