- CASSIM™ facilitates rapid model prototyping with pre-tested algorithms.
The pre-tested algorithms allow a model developer to construct a model by
interconnecting modules corresponding to the components on a P & ID, heat
balance, or control diagram from extensive CASSIM™ standard algorithm
libraries. With the descriptions of coefficients in the generic algorithm
manual, the modeler will enter physical data describing the geometrical data
and design curves and operating point data defining the initial operating
conditions. Given access to the required data, experienced CASSIM™ modelers
can construct large scope plant models, including major boiler and balance
of plant components, together with local control loops in weeks. CASSIM™ has
built-in flexibility to add user's customized algorithms.
- CASSIM™ model is flexible and easy to debug and troubleshoot. Model
developer can dynamically modify block input and output values, or even
block interconnections on-line without re-compiling the simulation code.
This is an important time-saving feature in model development, resulting in
substantial cost savings in modeling productivity and quality assurance.
OPERATING SYSTEM & CONFIGURATION
- CASSIM™ is fully PC based. It is optimized for operation on Intel
Pentium PC, running Microsoft Windows (Win 95, 98, Me, NT4, Win 2000, Win
XP). A full plant model can be developed and executed directly on the
popular PC as a 32 bit window application, eliminating the engineer’s
dependence on expensive mainframe or super-mini computer workstation.
- CASSIM™ based simulator can be configured as a single workstation
version, or a client/server version with one Server and multiple clients
using TCP/IP over Local Area Network (LAN), with each client PC displaying a
dedicated user interface screen. Such Simulator setup is used to emulate
multiple DCS Operator Stations Interfaces.
EXPANDABILITY & ADAPTABILITY
- CASSIM™ has built-in flexibility to add user's
Customized Algorithms. In addition to CTI’s continued effort to support and
expand the existing algorithms libraries, CASSIM™ system is designed to
allow you to build and maintain your own algorithms to meet your particular
- CASSIM™ provides users a powerful debugging tool
which facilitates easy and efficient model trouble-shooting during model
development and subsequent model update/maintenance. The powerful model
"merging" and "extraction" features allow recycling of different modules for
other applications, resulting in substantial cost savings in model
FULL RANGE OPERATION
- All CASSIM™ modules, and the system as a whole, may
be applied over the entire plant load range, from zero flow under cold start
conditions to beyond design conditions. Special features provide maximum
accuracy in all operating regimes.
FIRST PRINCIPLE BASED
CASSIM™, the entire simulation algorithms are based on first principle mass
and energy relations. Constitutive relations for mass and heat transfer are
based on well verified empirical correlations for the particular component.
CASSIM™ provides a user-friendly way of solving hydraulic flow network
problems by splitting the flow network into nodes, branches with pumps and
- The CASSIM™ modules are subdivided into libraries,
each distinguished by scope and application.
Special Steam Properties Table and Hydraulic Network Equations
Solver will be provided as part of the basic system to facilitate
real-time dynamic simulation.
|Pressurized Heavy Water Reactor (PHWR); ABWR (advanced boiling water
reactor); APWR (advanced pressurized water reactor), advanced CANDU
|HRSG, and fossil boilers; heat exchangers for
steam/water, gas, and air applications
Balance of Plant Models
Modules representing the steam turbines and feedwater
Electrical and Auxiliaries
|Electrical generators, transformers, electrical
breakers and buses, electrical switchgears; condensate returns,
auxiliary boilers, lubrication oil system modules.
|Modules representing gas turbine elements and HRSG
|Compressors, air surge tank modules. Combustion
modules provide modeling of gas combustion in gas turbine combustor and
duct burner. Furnace combustion modules provide realistic simulation of
furnace combustion processes and heat transfer.
|Modules which can be used to configure any hydraulic
flow circuit (fluid or gas phase, or 2 phases) into nodes and branches,
so as to facilitate simultaneous calculation of pressures in respective
nodes, and the flows in the respective branches. These flow network
computation techniques can be applied in various applications including
power generation, oil & gas, desalination, etc.
|Modules representing discrete control logic and
analog controller functions, including the supporting logic functions
for graphical user interface, as well as alarm monitoring and trending.
BUILDING MODEL USING CASSIMTM
CASSIM™ is a simulation development system based on
three common core technologies:
- CASSBASE: the block-oriented simulation modeling
tool. CASSBASE is used for managing block-oriented modeling, such as
sequencing, and interconnecting blocks, and generating thermal hydraulic
- CASSENG: the simulation run-time engine. CASSENG
enhances the model development facility by providing the ability to run the
simulation model dynamically while debugging the model in CASSBASE.
- LABVIEW® for Windows : the graphical user interface
from National Instruments. LabVIEW is used for user interface development.
The user interface screens communicate with the simulation model running in
CASSENG to allow user interactions with the simulation. LabVIEW Application
Builder is used to produce a stand-alone executable application consisting
of the user interface screens.
The seamless integration of these three tools provides a
powerful Microsoft Windows - based dynamic real-time model development
environment, and a user interface development environment for producing high
fidelity, user-friendly simulation applications. The CASSIM™ development system
is also capable of producing stand-alone simulation run-time applications.
THE CASSIM™ RUN TIME
The CASSIM™ Run Time Simulator Features provide:
- Unlimited Initial Conditions (IC’s) provide
selectable pre-programmed training scenarios.
- On-line programmable malfunctions provide valuable
training for plant abnormal & upset conditions due to malfunctions.
- Dynamic plant schematics provided at runtime, with
dynamic indications (equipment status and alarms), and full users
interactive capabilities via control pop-ups and drop down menus.
- Simulator Controls include Freeze/Run toggle &
- On-line parameter changes.
- On-line trending of plant process & control
- Convenient interface to external programs via
Dynamic Data Exchange (DDE) and TCP/IP over Local Area Network (LAN).
For details of the CASSIM™ based Simulators, please
visit PRODUCT section.