6.1. An experiment has been performed on a fired heater (furnace). The fuel valve was opened an additional increment of 2 percent in a step, giving the resulting temperature response in Figure 26.1. Determine the model parameters using both process reaction curve methods and estimate the in- accuracies in the parameter values due to the data and calculation methods. 15 100 Input variable, % open Output variable, C -5 5 10 20 25 -5 30 15 Time 6.1. An experiment has been performed on a fired heater (furnace). The fuel valve was opened an additional increment of 2 percent in a step, giving the resulting temperature response in Figure 26.1. Determine the model parameters using both process reaction curve methods and estimate the in- accuracies in the parameter values due to the data and calculation methods. 15 100 Input variable, % open Output variable, C -5 5 10 20 25 -5 30 15 Time