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Sylvain Quoilin Chapter 5 : Models of tests, the model is not capable of predicting the exhaust temperature anymore (see figure 46): This is due to the variation of the refrigerant level in the evaporator : since the two phase zone moves between the three heat exchangers, the hypothesis of a twophase zone located on the two last exchangers is not valid anymore. Another, more complete model has to be developed for the second and third series of tests. 5.4.3 Second model. The configuration of the evaporator is very particular : it is composed of three plate heat exchangers and two heat sources. Developing an appropriate model for this evaporator configuration is a difficult task : a multizone model has to be implemented for each heat exchanger, and the model can't be used for all the points : it has to be modified depending on the location of the twophase zone in the evaporator. In order to model this twophase zone, each heat exchanger has to be discretized, to take into account the modification of the fluid properties as a function of its quality. This discretization makes the convergence of the model more complicated. The purpose of the present work is to integrate a model of the evaporator into the global model of the cycle. This model must therefore be suitable for all the tests, and converge over a wide range of parameters. The idea of a discretized, multizone model is hence abandoned, and two other solutions are tested : ● Linear regression : A linear regression is performed in order to express the output of the Figure 46: Predicted vs measure exhaust evaporator temperature, first model 91PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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