DYNSYS-A Digital Computer Program for Studying the Transient Behaviour of Systems Using a Modular Approach

Abstract

This report deals with the transient behaviour of process systems such as those normally encountered by the chemical engineer. Two competing approaches for the numerical solution of this problem are described. The first is an "equation oriented" approach, and the second is an "equipment oriented11 or "modular" approach. The concept of modularity is discussed, and a brief presentation of its advantages is given. A program DYNSYS-B was written to apply the modular approach to transient studies. The program employs a predictor-corrector technique to solve the system's differential equations in a sequential fashion. The DYNSYS-8 program was applied to a multicomponent liquid-liquid extraction unit with heat effects and reflux, with the object of evaluating the program and gaining some experience with its use. Based on this study. we believe that the program is readily applied to the solutions of many problems. Some suggestions are made for improving the computation efficiency of the program.