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June 25th 2007 Paolo Greppi – UNIGE 1 of 24
Object-oriented modelling applied to hybrid unit
operationsPaolo Greppi, Barbara Bosio, Elisabetta Arato
Department of Civil Environmental Architectural EngineeringUniversità degli Studi di Genova
ICheaP-8 - The eight International Conference on Chemical & Process Engineering
ISCHIA Island Gulf of Naples, Italy - June 24-27th 2007
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Contents
� Introduction
� Streams, flashes, connectivity, multistage
arrangements
� Applications
� Conclusions
June 25th 2007 Paolo Greppi – UNIGE 3 of 24
Introduction: model workflow
LIBPF model
LIBRARY executable
library developer
model developer
model user
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mod
el
deve
lope
rlib
rary
de
velo
per
Model development
� pick up concrete classes from LIBPF� write a C++ program representing the
system model� compile it to a standalone executable
� map process simulation entities to � abstract C++ class types� mixins: reusable partial classes� concrete classes
LIBrary for Process Flowsheeting
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Model deploymentm
odel
us
er� receives system model as an executable� access via user interface� can change inputs or switch configuration� each model configuration has a fixed
structure
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Contents
��� IntroductionIntroductionIntroduction
� Streams, flashes, connectivity, multistage
arrangements
� Applications
� Conclusions
June 25th 2007 Paolo Greppi – UNIGE 7 of 24
The simplest object: stream
� abstract stream type
� specialized mixin classes are derived from abstract stream type
June 25th 2007 Paolo Greppi – UNIGE 8 of 24
Concrete stream types
� every concrete stream type contains at least one total phase
� multi-phase streams can have explicit representations of the phases
�stream_VLe...
�stream_VLLSSSe...
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Enter reactions
� Take a generic flash (genflash) mixin class
instance
� add reactions ...
� ... get reactive flashes
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Enter connectivitySpecial mixin types represent the capability of units to connect to streams
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Compose mixins ...connectivity
mixinprocess
mixin
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.. get a concrete class
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Variations of genflash with connectivity
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Combinations of generic flashes
� flexible mulstream concentrated parameters model: multihx
� N reactive streams exchanging heat or mass:� (reactive) multi-stream heat
exchanger
� (reactive) membrane unit
� fuel cell
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Multistage arrangements
� Concentrated parameter objects are combined to yield distributed parameter models:
� 1-D arrangements: �� columns columns
�� pipespipes
� 2-D arrangements:�� fuel cellsfuel cells
�� reactive heat exchangersreactive heat exchangers
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Contents
��� IntroductionIntroductionIntroduction
��� Streams, flashes, connectivity, multistage Streams, flashes, connectivity, multistage Streams, flashes, connectivity, multistage
arrangementsarrangementsarrangements
� Applications
� Conclusions
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Application 1: Simple distillation column
The column was broken down into 8 subunits:
2 multistage1D<genflashNX<stream_VL>>
3 genflashNX<stream_VL>
2 mixer
1 splitter
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Application 2: Distributed parameter planar Fuel Cell
� 5 x 10 multihx objects
� flowsheet for cross-flow arrangement
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Application 2: Distributed parameter planar Fuel Cell
� Results match proven tools
� Example: solid temperature plot for MCFC (Molten Carbonate Fuel Cell)
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Applications: simulation run duration
LIBPF slower than special-purpose tools
Benchmark LIBPFTiming, s Timing, s
Simple distillation column
Commercial process simulator X
1 10
Planar Fuel Cell
Special purpose 2-D finite differences code
2 60
Test caseReference tool (benchmark)
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Applications: modelling project durationmodelling of hybrid / complex unit operations
� conventional approach:
3 man-months
� new approach with model reuse:
1 man-month
(estimates)
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Contents
��� IntroductionIntroductionIntroduction
��� Streams, flashes, connectivity, multistage Streams, flashes, connectivity, multistage Streams, flashes, connectivity, multistage
arrangementsarrangementsarrangements
��� ApplicationsApplicationsApplications
� Conclusions
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Conclusions
� C++ can be used for process simulation using LIBPF library
� Run-time is slower than with conventional approaches ...
� ... but project duration is shorter for hybrid unit operations modelling
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Visit libpf.com
� Get C++ header files with the classes hierarchy
� Get and run demos
� Request the LIBPF library by mail
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