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Sylvain Quoilin Chapter 5 : Models 5.1 Introduction For each component of the cycle, a model is developed. It is validated on the measurements and the correlation between the predicted and measured values is presented. The simplified models used for the first set of tests are not necessarily suitable for the further tests : since the inputs of the cycle run over a wider range of values, the hypothesis of the first models are not always satisfied for the other tests, and new models have to be developed. The evolution of the models is thus described. A global model of the cycle is finally developed by connecting the aforementioned models together. The models are developed under EES (Engineering Equation Solver). The methodology used is the following : ● Each model is developed in a separate sheet. The parameters, the inputs and the outputs of the model are separated in the working sheet. ● The parameters of the model are identified and the model is validated by comparison with measurements carried out on the Rankine cycle test bench. ● The model is next placed into a module in the same sheet, in order to be easily transportable to another sheet. ● All the modules containing the models are finally copied into a separate sheet. The guess values of the modules are also imported, in order for those models to converge once integrated into the new working sheet. ● The modules are connected together in order to get the global model of the cycle. This method presents the advantage of creating a library of modules, each one containing a model. These modules can very easily be copied and used in other working sheets or for totally different projects. This avoids the necessity of rewriting the totality of the equations. Another important guideline followed during this work is the use of “procedures” as much as possible. Procedures are equivalent to modules at the exception that all the equations they contain are explicit. Every time it is possible, a model or a group of equation is put in a procedure instead of a module. This reduces the calculation time and simplifies dramatically the convergence of the resolution. 75PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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