Frank R Brown III

Thermo 1.01. Energy out minus Work in equals change in internal energy. Q - W = Delta U. You tell me it is an exothermic reaction. Therefore Energy (heat) must be removed. In the Isothermal case all heat is removed; it is a negative value. In the Adiabatic case all energy is used to heat up the products of reaction. There should be no energy stream. With Defined Temperature Outlet case, it is intermediate to both of the above. Some heat is used to raise the temperature to the desired level and the...

I suspect that you have done what I have done on a numberof occasions. You have let the installer put the program where it wants to, not where you want it. Try this solution. Right Click on the desktop short cut and choose File location. Then navigate to that location and try to look for a DWSIM.exe file. Choose that and see if it is version 9.02.

Dhinesh: Apparently, I forgot to post the converged simulation. Here it is. Frank

Chidu: i do not understand. Your Description sounds like a perfectly steady state simulation. And it seems straight forward. What are you trying to study in the Dynamic mode? the start-up or shutdown of the generator exhaust train? The cooling/condensing time in any heat exchanger is a function of the rate of heat transfer. Frank

Anonymous: Could you possibly post your latest simulation. Believe me at age 87 I am not interested in you research or thesis. I use DWSIM to stay active in Chem Engineering. So I solve problems like other elders work Cross Word puzzles. Actually, if we help you a nice Thanks in your thesis acknowledgement would be sufficient!

Dhinesh: Here is a solution that converged. Now all you have to do is adjust the parameters till you get what you want. Comment: The feed flows are very small. Why? You had no bottom product specified. I changed that.

Most of the simulations like the one explained are Steady State. 3500 kg/hr seems like a large amount of gas. Do you have any idea of its composition? That is how much is water vapour? Can you post the diesel simulation?

Subhash Kumar: Read the DWSIM User Guide (PDF) Chapter 11.3.5. It gives a very good explanation of the equations used in solving DE for the CSTR. Almost any text on Chemical Engineering Kinetics will also give details on the design of a CSTR, such as " Chemical Reaction Engineering" by Professor Octave Levenspiel Hope this information helps.