P4-17

PART 2 LINEAR OPEN-LOOP SYSTEMS increased quickly from 1.5 to 4.8gal/min, determine the transfer function that relates the height in the tank to the inlet flow. Be sure to use deviation variables and include units on the steady-state gain and the time constant. 4.17. A simple mixing process follows first-order behavior. A 200-gal mixing tank process, initially at steady state, is shown in Fig. P4-17. At time t=0, the inlet flow is switched from 5% salt to freshwater. What does the inlet flow rate need to be to FIGURE P4-17 reduce the exit concentration to less than 0.5% in 30min ? 4.18. Joe, the maintenance man, dumps the contents of a 55 -gal drum of water into the tank pro