1) Shown in the figure is a simple room temperature control system. The desired room temperature is set by manual adjustment of a potentiometer. The room temperature is sensed via a thermocouple and compared with the desired temperature. The error between the desired and actual value is send to the controller, and the controller sends a control signal to the solenoid valve which produces a linear movement of the valve spool, thus adjusting the hot water flow rate to the radiator. Desired Temperature Outside Temperature Heat Loss Potentiometer Controller Solenoid Valve Heat Input Thermocouple Hot Water Measured Temperature • Identify the basic elements of the system; reference input, output, controller, plant, actuator, sensor, disturbance. Draw a block diagram of this room temperature control system; also write the names and the physical units of the signals on the branches of the block diagram.