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Modelling and optimising single and multiple effect evaporators by using Aspen Custom Modeler (ACM), Microsoft Excel and Matlab

Idham Jihadi, Irfan Affiq (2018) Modelling and optimising single and multiple effect evaporators by using Aspen Custom Modeler (ACM), Microsoft Excel and Matlab. Honours thesis, Murdoch University.

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The modelling, optimisation and control analyses of single and multiple effect evaporators using Aspen Custom Modeller (ACM) is carried out to develop programs in different software packages for both single and multiple effect evaporators from an example of double effect evaporator model equations written in ACM. To develop the programs, the developed model equations must be understood thoroughly.

The case study was taken from the example provided by ACM, which was part of the ASPEN software package. The example from ACM involves double effect evaporators and the procedure to concentrate glycol from a dilute aqueous solution of 3.5w% of a glycol. A simulation for both single and multiple effect evaporators is performed by using Microsoft Excel, Matlab and ACM. Both models perform a steady-state and optimisation simulation. To build the simulation, a study on the process model is necessarily required. The study will be carried out by using Microsoft Excel spreadsheet. Microsoft Excel is chosen to be the medium of study because the sequences of equations solved during performing the simulation is much easy to understand. The simulation will start with developing the steady-state model for a single effect evaporator. Once the single effect is tested, then the steady-state model for multiple effects is developed and tested. After that, the case study is continued with the phase of developing an optimisation simulation of a single effect evaporator. Subsequently, the optimisation of single effect evaporator is successfully tested, the case study continues with developing an optimisation for multiple effect evaporators.

The final phase is carried out to run a performance analysis between ‘FSolve’ function and ACM. Besides performance analysis, a sensitive analysis in both single and multiple effect evaporators is also being done by using ACM. The performance analysis proves the optimisation simulation in ‘FSolve’ has not much different from the optimisation simulation perform in the ACM and the sensitive analysis produce an expected result. With the performance and sensitive analysis results, the case study can conclude that the three software packages successfully simulated single and multiple effect evaporators. However, there is a plenty of room to make improvements in this case study.

Item Type: Thesis (Honours)
Murdoch Affiliation(s): School of Engineering and Information Technology
Supervisor(s): Vu, Linh
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