![]() ![]() and a problem has shown up in my simulation. A reasonable compromise is achieved by using the largest possible step size, while maintaining an acceptable degree of accuracy without becoming unstable.I am doing my final student project using Aspen Hysys V.10. However, this gain in rigour is offset by the additional calculation time required to simulate the same amount of elapsed real time. ![]() The smaller the time step, the more closely the calculated solution matches the analytic solution. Therefore, numerical integration is used to determine the process behaviour at distinct time steps. Non-linear differential equations can be formulated to approximate the conservation principles however, an analytical solution method does not exist. The equations for material, energy, and composition balances include an additional “accumulation” term which is differentiated with respect to time. On the other hand, the dynamic model uses a different set of conservation equations which account for changes occurring over time. The dynamic model simulates the thermal, equilibrium, and reactive behaviour of the chemical system in a similar manner as the steady state model. The HYSYS dynamic model shares the same physical property packages as the steady state model. Transitions between operating conditions.In HYSYS, the dynamic analysis of a process system can provide insight into the process system when it is not possible with dynamic simulation, you can investigate: Dynamic analysis provides feedback and improves the steady state model by identifying specific areas in a plant that have difficulty achieving the steady state objectives. You can examine the dynamic response to system disturbances and optimize the tuning of controllers. You can design and test a variety of control strategies before choosing one that is suitable for implementation. Offline dynamic simulation can optimize controller design without adversely affecting the profitability or safety of the plant. By defining detailed equipment specifications in the dynamic simulation, you can verify that the equipment functions as expected in an actual plant situation. With dynamic simulation, you can confirm that the plant can produce the desired product in a manner that is safe and easy to operate. The transient behaviour of the process system is best studied using a dynamic simulation tool like HYSYS. Feed and environmental disturbances, heat exchanger fouling, and catalytic degradation continuously upset the conditions of a smooth running process. Chemical plants are never truly at steady state. Dynamic simulation can help you to better design, optimize, and operate your chemical process or refining plant. This is a powerful tool that is quickly gaining use in several industries and companies. Now, it is possible for any design to have an associated dynamic simulation that will test the controllability of the process before it is constructed. ![]() In the past, creating a dynamic simulation for a new process to test for controllability issues was a luxury that could not be afforded. The ability for process engineers to create accurate dynamic simulations quickly is quite new. However, dynamic simulations are required when an engineer is examining controllability and equipment sizing issues. Steady state simulations can help process engineers in choosing an appropriate design that will meet certain conditions. ![]()
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