Modelon's Environmental Control Library - Overview from 2015

1. An overview
ENVIRONMENTAL CONTROL LIBRARY
7 September 2017 © Modelon

2. AGENDA
• What is Environment Control Library (ECL)?
• History
• Key features
• ECL and other Modelon Libraries
• Library contents
• Recent improvements
• Application examples
• Contact
7 September 2017 © Modelon

3. WHAT IS ENVIRONMENT CONTROL LIBRARY (ECL)?
• A Modelica model library for aircraft environmental control
systems analysis and design
• Designed to study energy consumption and thermal conditions
that affect the level of comfort for passengers and crew
• Performance aspects driven by large variations in ambient
conditions (humidity, temperature)  ECL models account for
these effects through first principles and fully support
bidirectional flow.
7 September 2017 © Modelon

4. ECL HISTORY
• Developed internally at Modelon since a number of years
together with a European airframer
• Publically available with version 3.1 (September 2015)
• A package hardened through industrial program deployment.
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5. KEY FEATURES (1)
• Flexible composition of user-defined system
architectures for efficient model management
• Real-time capable high performance models
enabling Hardware-In-the-Loop (HIL) applications
• Full support for bidirectional flow for analysis of all
modes of operation on ground and in flight
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6. KEY FEATURES (2)
• Efficient representation of moist air enabling
robust and fast simulation of large-scale
systems
• Online visualization of simulation results for
intuitive understanding of the system behavior
• Configurable model fidelity for faster simulation
and right complexity level
• Easy integration with other libraries
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7. CONNECTIONS WITH OTHER MODELON LIBRARIES
RELEVANT FOR COOLING SYSTEMS
• Air cycle refrigeration
systems
 turbofan system
 bootstrap system
 reversed bootstrap
system
 ram powered reverse
bootstrap
• Vapor cycle refrigeration
systems
• Liquid cooled systems
• Environmental Control Library
• Fuel System Library
• Vapor Cycle Library
• Liquid Cooling Library
• Heat Exchanger Library
7
• acceleration forces
• positioning in 3D space
• air/fuel mixed and unmixed
• moist air
• turbines,
• fans
• compressors
• ejector
7 September 2017 © Modelon

8. IMPROVEMENTS
• Previous version of Environmental
Control System Library 3.3
• Library restructured for easier
navigation
• Documentation has been substantially
updated
• Fixed bugs
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9. RECENT IMPROVEMENTS
• Current version of Environmental
Control System Library 3.3.1
• Updated to latest changes in Modelon
Base library
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10. • An efficient and numerically robust
framework suitable for large-scale
complex systems.
• Library includes:
 heat exchangers
 compressors
 turbines
 pumps
 volumes
 valves
 cabin
 pipes
ECL CONTENTS
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11. • Model that lets you choose
between purely static mass and
energy balances and one with
(optional) dynamic volume
included
• Heat transfer: external only
exposes volume temperature to
port, internal resistance defined
by constant coefficient
PIPES

12. • Dynamic energy and mass
balances
• Volume without hydraulics
resistance
• Spray volume with additional
water spray inlet
• Static water separator model
VOLUMES

13. TURBINE AND COMPRESSOR
• Table based components
• Characteristic maps to be
provided as tables
• Draft physical
components based on
Hans’ ideas.

14. • Table based component
with water condensation
• Basic NTU-version (dry
conditions only)
HEAT EXCHANGERS

15. • Ejector with three ports
 Motive flow inlet port
 Suction port
 Discharge port
• Check valve
• Control valve (Kv-value
parameterization)
PUMPS AND VALVES

16. • Single port sensors: p, T
• Two port flow sensors:
m_flow, V_flow
• System settings and
boundary conditions
 System settings
(altitude, Mach
number, etc.)
SENSORS AND FLUIDS

17. • Pressure source/sink,
• Multiple pressure
source/sink
• Mass flow source/sink
• Options: set parameters,
signal inputs, use
atmosphere information
from system component
BOUNDARY CONDITIONS

18. COVERED COOLING SYSTEMS
• Air cycle refrigeration systems
 Bootstrap system
 Reversed bootstrap system
 Ram powered reverse bootstrap
• Vapor cycle refrigeration systems
• Liquid cooled systems
18
C919, air cycle machine
Source: wikipedia
7 September 2017 © Modelon

19. ECL LIBRARY APPLICATIONS
• Offline simulation of complete ECL-system through complete
flight envelope and all operating conditions
 Large systems
 Includes controls, sequential and feedback
• Real time simulation of the same system models
 Some simplifications, but same overall model (real time
capability achieved through model configuration selection)
 To be included in special flight simulator hardware
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20. A RAM COOLING SYSTEM
20
Main Heat
exchanger
Fan
Ram air Exhaust
air
Preliminary
Heat exchanger
7 September 2017 © Modelon

21. A RAM COOLING SYSTEM
ECL 3.3
Ram
air
21
Quasi-steady-state
components:
• System (1)
• Turbines (2)
• Compressors (3)
• Heat exchangers (4)
• Flow resistances (5)
• Sinks/sources (6)
Mass and energy storage:
• Dynamic volumes (incl.
e.g. moisture
condensation) (7)
(1)
(2) (3)
(4) (5)
(7)
(6)
Hot air
(4)(6)
(6)
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22. • More example models
• Improvements based on customer requests
FUTURE DEVELOPMENT

23. For more information, please contact:
sales@modelon.com
www.modelon.com
CONTACT INFORMATION
237 September 2017 © Modelon