A constant block is used to set the desired temperature of the cylinder, and the difference between that signal and its actual temperature acts as an input to the PI controller. Based on that input, the pump activity is regulated to reach and maintain the desired temperature. At 50 seconds, a disturbance in the form of an external heat flow starts affecting the system.
Here, dynamic diagrams have been built into the connection lines that correspond to either heat flow or mass flow. The thickness of these lines depends directly on the size of the flow. Also, the color of the cylinder indicates its temperature, ranging from high (red) to low (gray).