Question 54 marks An open loop dynamic test has been performed on an air drier to relate the input power to the exit. Air temperature from the drier has been given in Figure below. From the shape of the normalized response an under damped model may be proposed. An ultimate temperature difference of 7.5C is obtained from a base temperature of 72C, for an input power change of 22 kcal/min (calculated from the change of steam flow rate). 1.6 1.4 1.525 1.2 YUVY ULT 1.145 1.0 0.8 0.6 Your 0.4 0.2 1.8 32 9.625 0 10 12 16 8 Time, min The normalized step response of a drier with air recycle. Using the graphical parameters of the Figure above, find the characteristic values of response and find the transfer function of the system. 3.34