The document provides an overview of logical operations in Aspen HYSYS, including set, adjust, balance, recycle operations, and spreadsheet functionalities for process modeling. It describes how to implement each operation, their functions, and includes examples and exercises to reinforce understanding. Emphasis is placed on the relationship between process variables and the integration of these operations within simulations.

1. Supported by:
Aspen HYSYS Training
Module 4: Logical Operations
Tutor:
M. Ersharry Yunashtanto
Zayyanatun Zulfa
Ikha Muliawati
Mada Harahap

2. • The Set Operation
• The Adjust Operation
• The Balance Operation
• The Recycle Operation
• The Spreadsheet
Logical Operations Used in HYSYS Steady State

3. SET OPERATION

4. • Function : used to set the value of specific Process Variable (PV)
in relation to another PV.
• The set operation only can be used to define relationship
between the same PV in two like objects,
i.e.: relationship between two temperatures of two different
streams.
• The dependent, or target variable is defined in terms of
independent, or source variable according to the following linear
relation:
Set Operation
Y = MX + B
where: Y = Dependent (target) variable
X = Independent (source) variable
M = Multiplier (slope)
B = Offset (intercept)

5. How to Add Set Operation (1st method)

6. How to Add Set Operation (2nd method)
click
Double
click

7. Example Using Set in Simulation

8. Set Connections Tab
Click to choose Target Object
and variable to set
Click to choose Source
Object where independent
variable placed

9. Set Parameters Tab
Define Multiplier and offset
for dependent variable
towards independent
variable

10. ADJUST OPERATION

11. • Function : varies the value of one stream variable (the independent
variable) to meet a required value or specification (the dependent
variable) in another stream or operation (automatically conduct the
trial and error iterations.)
• Unlike set operation, Adjust can be used for both different and same
Process Variable in two different objects.
Adjust Operation

12. How to Add Adjust Operation (1st method)

13. How to Add Adjust Operation (2nd method)
click
Double
click

14. Example Using Adjust in Simulation
Adjusting feed
temperature to
get specific
molar flow rate
in SepLiq.

15. Adjust Connections Tab
Click to choose object
and variable that want to
be adjusted
Click to choose target
object and variable
Type the specified
target value
User can input
specific target
value, or choose
the value from
another object
with the same
process variable

16. Adjust ParametersTab
Define convergence criteria on this tab.
Method:
Broyden: used this to quickly converge
to the desired value
Secant: generally results in good
convergence once the solution has
been bracketed
Tolerance: The maximum difference
between the Target Variable and the
Target Value
Step Size: The initial step size
employed until the solution is
bracketed
Minimum/Maximum: The upper and
lower bounds for the independent
variable (optional) are set in this field
Maximum Iterations: The number of
iterations before HYSYS quits
calculations

17. SET & ADJUST OPERATION EXERCISE
Problem Description:
There are two wells (A and B) with different composition that want to be joined.
Well temperature and pressure are 120oC and 40 barg.
A : B Molar flow ratio is 80 : 20
The expected gas flowrate from well is 300 MMSCFD
And water gas ratio is 20 Sbbl/MMSCF
TARGET PFD
OPEN FILE :
SET-ADJUST EXERCISE-STARTER.HSC

18. BALANCE OPERATION

19. • Function : provides a general-purpose heat and material balance
facility.
• There are six Balance types which are defined in the table below:
Balance Operation
Type Definition
Mole An overall balance is performed where only the molar flow of each
component is conserved.
Mass An overall balance is performed where only the mass flow is conserved.
Heat An overall balance is performed where only the heat flow is conserved.
Mole and
Heat
An overall balance is performed where the heat and molar flow are
conserved.
Mass and
Heat
An overall balance is performed where the overall mass flow and heat flow
are conserved.
General HYSYS will solve a set of n unknowns in the n equations developed from
the streams attached to the operation.
Component ratios may be specified on a mole, mass or liquid volume
basis.

20. How to Add Balance Operation (1st method)

21. How to Add Balance Operation (2nd method)
click
Double
click

22. Example Using Balance in Simulation
create a stream that
has the same molar
composition and
flow rate as another
stream, but a
different pressure
and temperature
(e.g. - at dew point
conditions)

23. Example Using Balance in Simulation
all the
components of gas
stream RX Inlet are
converted to pure
propane in
the outlet stream RX
Outlet at the same
pressure condition.
Determine the
temperature of RX
Outlet when there is
no accumulation
happen.
Mass in = Mass out

24. Balance Connections Tab
Click to choose
inlet stream
Click to choose
outlet stream

25. Balance Parameters Tab
Click to choose
balance type

26. Balance Worksheet Tab
Mass Flow for each
stream is the same
Temperature of
RX Outlet

27. BALANCE OPERATION EXERCISE
Problem Description:
Create a stream that has the same molar composition and flow rate as another stream, but a different
pressure and temperature (e.g. - at dew point conditions). dewpoint of the product at 6000 kPa.
TARGET PFD
OPEN FILE :
BALANCE EXERCISE-STARTER.HSC

28. RECYCLE OPERATION

29. • Use this operation every time you need to recycle a stream.
• The logical block connects the two streams around the tear stream
(stream with temporary specification).
• Before you can install the RECYCLE the flowsheet must have
completed. That means there need to be values for both
the assumed stream and the calculated stream.
• Once the Recycle is attached and running, HYSYS compares the
two values, adjusts the assumed stream, and runs the flowsheet
again. HYSYS repeats this process until the two streams match
within specified tolerances.
Recycle Operation

30. How to Add Recycle Operation (1st method)

31. How to Add Recycle Operation (2nd method)
click
Double
click

32. Example Using Recycle in Simulation

33. Recycle Connections Tab
Click to choose
inlet stream
Click to choose
outlet stream
Inlet stream will always
be a product stream
from a unit operation.
Outlet stream will
always be a feed
stream to a unit
operation

34. Recycle Parameters Tab
to set the
convergence criteria
factor for each of
the variables listed
to select the transfer
direction of the
variable

35. RECYCLE OPERATION EXERCISE
Problem Description:
a two-phase feed stream (FEED) is mixed with a recycled stream (RECYCLE) and fed to separator V-
100. The vapour from V-100 is expanded in expander E-100 and then reflashed in separator V-101.
Half of the liquid from this separator is fed to pump P-100 and then recycled back and mixed with
the fresh feed.
TARGET PFD
OPEN FILE :
RECYCLE EXERCISE-STARTER.HSC

36. SPREADSHEET

37. • The Spreadsheet applies the functionality of Spreadsheet programs
to flowsheet modeling. With essentially complete access to all
process variables, the Spreadsheet is extremely powerful and has
many applications in HYSYS.
• The HYSYS SPREADSHEET has standard row/column
functionality. You can import a variable, or enter a number or
formula anywhere in the spreadsheet.
• Complex mathematical formulas can be created, using syntax which
is similar to conventional Spreadsheets. Arithmetic, logarithmic, and
trigonometric functions are examples of the mathematical
functionality available in the Spreadsheet.
Spreadsheet

38. How to Add Spreadsheet (1st method)

39. How to Add Spreadsheet (2nd method)
click
Double
click

40. Example Using Spreadsheet in Simulation

41. Spreadsheet Connections Tab
Used to Add, Delete
and Edit Imported and
Exported variable

42. Spreadsheet Parameters Tab
Used to edit number of
column and rows on
the spreadsheet
Show cells that contain
calculated results form
formulas define on the
spreadsheet

43. Spreadsheet Formulas Tab
Show the results of the
calculation
Show Formulas used
for calculation

44. Spreadsheet Tab
Color Code:
Blue: Show
independent value
imported from stream
in the simulation or
value/text that we
manually type on the
spreadsheet.
Black: Show
dependent value
imported from stream
in the simulation.
Red: Show cell that
contain formulas

45. How to Import Data to Spreadsheet Tab (1st Method)
1. On the spreadsheet cell,
right click the mouse
and then choose import
variable
2. Select variable to be
import
3. Click OK

46. How to Import Data to Spreadsheet Tab (2nd Method)
1. Open stream that want to be
imported to spreadsheet
2. Right click on the variable that
want to imported. HOLD the
right click.
3. Drag the mouse to desired cell.
RELEASE the right click

47. How to Import Data to Spreadsheet Tab (3rd Method)
Select targeted cell

48. SPREADSHEET EXERCISE
From fluid composition described in the feed stream and following information, calculate reynold’s
number of the liquid.
Pipe ID : 0.02 m
TARGET
SPREADSHEET
OPEN FILE :
SPREADSHEET-STARTER.HSC
Re = Reynold number, dimensionless
ρ = liquid density (kg/m3)
D = pipe ID (m)
v = liquid flow velocity (m/s)
μ = liquid viscosity (kg/m-s)
Viscosity
1cP = 0.001 kg/m-s

49. Thank You
M. Ersharry Yunashtanto
Zayyanatun Zulfa
Ikha Muliawati
Mada Harahap

50. • Aspen Hysys Unit Operation Guide, Aspen Technology, 2011
• HYSYS.Plant Simulation Basis, Hyprotech Ltd, 2000.
• “……………….”, Process Simulation Workshop.
REFERENCES