Positive Step Change to Set Point and Fan

Let us consider an experiment, wherein, a positive step change of 5$^\circ$ C (from 35$^\circ$ C to 40$^\circ$ C) was provided to set point at time t=250 s and a step change to fan was provided at t = 500 s, from 100 to 150.

Figure 10.3: Xcos output for positive Step Change to Set Point and Fan

Figure 10.4: Temperature and Heater plot

As can, be seen above, when, the temperature set point is raised to 40 from 30, at t=250 s, the value of the heater increases, so that it can heat up the plant upto the required set point. Similarly, when the fan speed is increased at t=500s, the heater value increases yet again to maintain the same constant temperature of the SBHS blade.