Table of Contents
What is sensitivity analysis Aspen?
During a sensitivity analysis (or design specification) Aspen iterates its calculation sequence through a range of values provided for an independent variable, in order to obtain a specified result for a dependent variable (within a certain tolerance).
How is sensitivity analysis performed?
The sensitivity analysis is based on the variables that affect valuation, which a financial model can depict using the variables’ price and EPS. The sensitivity analysis isolates these variables and then records the range of possible outcomes.
What is Property method in Aspen?
Aspen has four main types of Property Methods: Ideal, Equation of State, Activity Coefficient, and Special Systems. In addition, an advanced user can modify any of these available methods or create a new property method on their own.
What is sensitivity analysis chemical engineering?
A sensitivity analysis methodology based on continuation techniques is applied to chemical engineering processes. The method is based on the trace of the optimal solution path of a process model under multiple model parameter variations of finite magnitude.
How do you add a reaction to Aspen Plus?
Reactions – Stoichiometry
- Select New…
- Reaction Name: enter a name for the reaction set.
- Select Type: LHHW.
- Select OK.
- In Stoichiometry select: New.
- Under Rectants: select acetone from the components pull-down menu and set the coefficient to -1.
- Under Products: select ketene and methane and set both coefficients to 1.
Why is NRTL used?
NRTL0-HOC (Hayden-O’Connell) model is used when you have a non-ideal vapor containing polar or solvating compounds. hi Moonsang, check this paper. NRTL is a non-random two-liquid model used for calculating activity coefficient to take into account non-ideality in the liquid phase.
What is NRTL property method?
The non-random two-liquid model (abbreviated NRTL model) is an activity coefficient model that correlates the activity coefficients of a compound with its mole fractions in the liquid phase concerned. It is frequently applied in the field of chemical engineering to calculate phase equilibria.
Where is the model palette in Aspen?
Properties Controls Click on the Simulation environment button on the bottom left panel. A new contextual ribbon for the Simulation Environment was designed to be workflow-oriented (Figure 16). You will see the Model Palette appear on the bottom of a blank flowsheet.
What is FT correction factor in HYSYS?
Warning sign in Aspen HYSYS such as low ft correction factors and temperature cross are also considered in this test. A ‘ft correction factor’ is defined as a ratio of the true mean temperature difference to the log-mean temperature difference (see Eq(2)).
Can you manipulate the stage efficiencies in a sensitivity analysis?
You can manipulate the stage efficiencies in a sensitivity analysis, but this method has several pitfalls for the unwary and I do not recommend this as results are readily misinterpreted whenever you use stage efficiencies other than ideal. The method I have used often is to change the number of stages by hand and record the results.
How to simulate distillation process using HYSYS?
To simulate the process, Aspen HYSYS was employed to develop the model of the process using Distillation Column Sub- Flowsheet having 21 stages apart from the condenser and the reboiler. The column was divided into five (condenser, rectifying, reaction, stripping and reboiler) sections.
Can I manipulate block-var variables in sensitivity analysis?
Whatever Block-Var variable you are manipulating is likely tied to some other parameter. You can manipulate the stage efficiencies in a sensitivity analysis, but this method has several pitfalls for the unwary and I do not recommend this as results are readily misinterpreted whenever you use stage efficiencies other than ideal.
