Recent content by David Deal

1. Steady State Distillation Process

Hi David What did you but for the ii) part of the question? I was thinking it would be: Q=UA(Tf−Ts) where U = overall heat transfer coefficient for the system (Wm^−2∘C^−1) A = heat transfer area (m2).
2. How proportional action is produced in a pneumatic controller

Hey Jim Thanks for the info, someone at work is very good at PID controllers also. The above solutions are correct. I will mark this as solved now. Thanks again
3. How proportional action is produced in a pneumatic controller

Thats great. Thanks for the information. Now I have to derive an equation for Po relating to measure and desired pressures for b). Any pointers?
4. How proportional action is produced in a pneumatic controller

Homework Statement (a) With the aid of a sketch explain how proportional action is produced in a pneumatic controller whose output is 0.2 to 1.0 bar. Assume that the controller is direct acting. (b) Show, mathematically, that the output is dependent on the difference between the measured and...
5. Single transfer lag in an open-loop system

Hello everyone. I am new to Physics Forums. I seem to be doing the same course studying as you all too. I am having difficulty on how you managed to get t = -5 ln(4/10) t = 2.55 I am coming out with t = 4.58 Any help would be greatly appreciated. Thanks