Design a PD controller so that the peak time of the PD-compensated system is reduced by a factor of 1.5 from the peak time of the gain-compensated system, and the damping ratio remains at 0.6. Determine the location of the compensator zero, calculate the corresponding overall gain KP and calculate the resulting s

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?