Aspen HYSYS Training
Module 1: What is Aspen HYSYS?
Tutor:
M. Ersharry Yunashtanto
Zayyanatun Zulfa
Ikha Muliawati
Mada Harahap
Supported by:
Simulation
+
Use of a computer program to quantitatively model the characteristic
equation of a process in term of material and energy stream.
Principle
Known Feeds
Predict Products
Given
Process Model
• Process Design/Analysis
• Optimization
• Equipment Sizing, Costing
Principle 2
Example of process model
Recycle flowrate?
Catalyst?
Steam Rate ?
Reflux?
P?
CW rate?
T, P?
Chemistry?
Reactor type?
Number
of trays?, Feed Stage?
Right sequence?
Purity?
Model

Steady-State Modeling: Input – Output = 0
FV
F
x

F(x)
xi
FL
F  FV  FL
Solution Space
0
xs
F(x)=0
•Design
•Operation
•Optimization
Simulation Taken Time
or Number of Iteration
Dynamic Modeling: Input – Output = Accumulation
PC
F
FC
FV
x
•Design Verification
•Operation Analysis
•Control Strategy
•Operator Training
LC
FL
dV / dt  F  ( FV  FL )
0
Time
HYSYS Uniqueness
• Interactive Simulation (Automatic Calculation)
• Automatic detection of Degree of Freedom
• Automatic stream Flash calculation
• Full Microsoft Windows Program (click, cut and paste, object,,,)
• Bi-directional calculation (non-sequential)
• Easy to learn & use
• Fast solver (speed)
• Extensibility
• No Input text file (think about MS Excel)
• Fully integrated Steady and Dynamic simulation
Degree of Freedom
Degree of Freedom: the number of independent parameters that define its
configuration
DOF = No of variables – No of equations
5x + 3y = 75
10x + 6y = 150
Yes, because it has unique solutions. DOF = 2 – 2 = 0
Degree of Freedom (2)
DOF in Process Balance = No. of unknown variables + No. of reactions – No
of independent material balances – No. of other relationships
From above case, we can create 3 material balance (oxygen, nitrogen,
and total). However they all will not be independent.
You will need one other relationship. Let’s say you have created total
and oxygen balance (2 equation), then one (1) other relationship equation
will be
yN2 = 1 – yO2
Then, DOF = 3 + 0 – 2 – 1 = 0 (solved)
Degree of Freedom (3)
• Independent Variables
− Intensive variables(x,T,P,V,H,S) : Strength, Quality, Shape
− Extensive variables (F,Q,delta P) : Size, Quantity
• To define Stream completely
− Chemical Components
− State
− Temperature
− Pressure
− V/F (Vapor Fraction) ?
− Quantity
− Flowrate
• To define Process Unit
− All Units: Pressure Drop
− Heater/Cooler, Pump, Compressor: Q(Duty)
− Heat Exchanger, Distillation Column: more specifications
Density ?
Viscosity ?
Cp, Cv, Cp/Cv ?
Enthalpy ?
Thermal Conductivity ?
MW ?
K-value ?
etc....
DOF
Specification
User Input
User Specified
BLUE Variable in HYSYS
First Things First…
Have you installed hysys
with appropriate version??
It is more difficult to open
newer version in older
version (e.g 8.0 to 7.3).
What Good Looks Like..
What Good Doesn’t Look Like..
Thank You
M. Ersharry Yunashtanto
Zayyanatun Zulfa
Ikha Muliawati
Mada Harahap