1 EQE038 – Simulação e Otimização de Processos Químicos Argimiro R. Secchi – Aula 3 – Advanced modeling capabilities in the EMSO model editor. EQ/UFRJ 29 de agosto de 2014

2 Plug-ins – External Routines Termodynamics – VRTherm EML – Streams IF-THEN-ELSE Switching models (switcher) FOR Other features in the modeling language

3 Using External Routines - Plugins EMSO is a simulator based on equations and its modeling language allows to directly express the equation of the equipment. However, there are some cases that the description directly in the form of equations is not convenient, typical examples include: Some parameters of the model require initialization procedures (routines); The mathematical relationships require a high number of data; The user already has its own routine calculations; EMSO solution: plug-in system that allows any routine written in C, C++ or FORTRAN to be used within the models. The plug-in interface is open, anyone can implement a new plug-in.

4 Using the Plugins Plugin: To use an external procedure in the models the user needs to declare a special parameter called Plugin: Once the Plugin has been declared, the user can call its methods using the notation: Before running a simulation, EMSO will check: If all methods used in the models were properly implemented in the plugin. If the number of arguments and the units of measure are correct. Variable = Plugin.method(args)

5 Rankine cycle: thermodynamic properties in FORTRAN 90 Example: Routine calculations developed by the user: Plugin propterm.dll Using the Plugins

6 Applying in a thermoelectric power plant File: sample/water_steam/sample_power_plant.mso Using the Plugins

7 VRTherm – Methods Main Thermodynamic Models Flash Calculation Pure component Properties

8 Properties of mixtures VRTherm – Methods

9 The development of a basic material stream is the starting point for a library of models. In order to made compatible with each other, the models created ​​ by many different people need to be directly connected. That is, it should be possible the output calculated by a model be connected to the input of another model. For this goal to be reached, all models should use standard streams, which enable integration of different models featuring a library. Standard EML Streams

10 Inletstream Inlet material streams should be of type stream Outlet Outlet material streams should be of type: liquid_stream: liquid_stream: liquid phase vapour_stream: vapour_stream: vapor phase streamPH: streamPH: when the vaporized fraction of the stream is unknown. It made ​​ a flash calculation to determine the thermodynamic state of this stream. Using EML Streams

11 Example – Flash Model Models/flash.mso

12 Flash Steady – Simulation Example: run the flowsheet of the file sample_flashPH.mso. The original problem is an adiabatic flash. Consider also the results specifying the pairs (T, P) and (T, Q) instead of (P, Q). Test the problem of calculating the feed temperature or feed pressure specifying T, P and Q.

13 Distributed Models – Heat Exchanger A heat exchanger may be represented by a system formed by two ducts. Description of the duct Models/HeatExchanger.mso

14 Heat Exchanger – Duct Modeling

15 Aggregation in the heat exchanger Heat Exchanger Modeling

16 Using IF THEN ELSE END Heat Exchanger Modeling

17 Heat Exchanger – Distributed Model

18 Heat Exchanger – Distributed Model

19 Example: run the flowsheets HeatX and HeatX_Discretized in the file Sample_HeatExchanger.mso. Compare the temperature of the output stream. Export the results of the discrete to Excel or LibreOffice building the temperature profiles of the heat exchanger: Heat Exchanger – Simulation

20 Switcher – textual parameters

21 Decisions independent of the user's choice Switcher – textual parameters

22 Distributed Models– pipe model

23 FOR command Vectors Matrices Distributed Models– pipe model

24 Exercise 1) Build a model of a pressure pan with a relief valve (with constant equal to 0.07 cm 2 ) which opens when the pressure is greater than 5 times atmospheric pressure, and closes when less than four times this pressure. Consider a 5 L pan with 20 cm in diameter containing only water with an initial level of 10 cm and a temperature of 25 °C. The heating is done at a rate of 10 kW. Simulate the pan for 10 minutes. Consider the phases in thermodynamic equilibrium model and use the Peng-Robinson model.

25 For helping in the preparation of this material Special thanks to For supporting the ALSOC Project. Prof. Rafael de Pelegrini Soares, D.Sc. Eng. Gerson Balbueno Bicca, M.Sc. Eng. Euclides Almeida Neto, D.Sc. Eng. Eduardo Moreira de Lemos, D.Sc. Eng. Marco Antônio Müller

26... thank you for your attention! Process Modeling, Simulation and Control Lab Prof. Argimiro Resende Secchi, D.Sc.Prof. Argimiro Resende Secchi, D.Sc. Phone: Phone: EP 2013 Solutions for Process Control and Optimization Solutions for Process Control and Optimization