The document outlines the use of subflowsheets in Aspen HYSYS for simulating complex processing facilities through a multi-level flowsheet architecture. It details methods for adding subflowsheets, such as using existing templates or creating blank flowsheets, and emphasizes the significance of transfer basis in defining parameters for fluid packages. Additionally, it includes exercises related to developing a simplified refrigeration unit within a subflowsheet.

1. Supported by:
Aspen HYSYS Training
Module 6: Subflowsheet
Tutor:
M. Ersharry Yunashtanto
Zayyanatun Zulfa
Ikha Muliawati
Mada Harahap

2. • The subflowsheet operation uses a multi-level flowsheet
architecture and provides a flexible and simplified method for
building a simulation.
• It is very useful when simulating a large, complex processing
facility with a number of individual process units.
Subflowsheet in Aspen HYSYS

3. Example of Using Subflowsheet

4. How to Add Subflowsheet? (1st Method)

5. How to Add Subflowsheet? (2nd Method)

6. Source for Subflowsheet
1. Read an Existing Template: Using existing
template available in Hysys (.tpl)
2. Start With a Blank Flowsheet: Using our own
template
3. Paste Exported Objects: Hysys imports
previously exported object (.hfl) into a new
subflowsheet

7. Transfer Basis
• Each subflowsheet can have its
own fluid property package. For
example, in main flowsheet using
Peng-Robinson and subflowsheet
using Amines package.
• In this case, transfer basis in
subflowsheet shall be considered.
• Transfer basis determines which
parameter that we want to keep
the value equal when we transfer
stream to different fluid package

8. • Refrigeration Cycle Principle
Study Case: Refrigeration Unit
Process Fluid
Compressor
Condenser
Expansion (J -T) Valve
Kettle
Chiller
Refrigerant
hold-up drum
Refrigerant Circuit
A
B
D
Q out
Q in
A
Condensation BC
Vaporization
D
Specific enthalpy
Log pressure
p1
p2
Expansion Compression
GasGas and
Liquid
Liquid
Exercise:
Make it own
subflowsheet for
refrigeration unit.

9. Study Case: Refrigeration Unit (2)
Develop simplified Refrigeration unit in
Refrigeration-Subflowsheet Exercise.hsc
file.

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