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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen

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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen ( modeling-low-temperature-rankine-cycle-small-scale-cogen )

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Sylvain Quoilin Chapter 5 : Models Inputs and outputs of the model : It can be considered that the model takes as input : Expander supply temperature Expander exhaust pressure Refrigerant flow rate Ambient temperature The outputs of the models are : Expander exhaust temperature. Expander shaft output power Expander supply pressure : since the expander is a volumetric machine, it can absorb a fixed volumetric flow rate. In order to make this volumetric flow rate fit to the mass flow rate, the supply pressure has to be adapted. This explains why the supply pressure is also an output of the model. Identification of the parameters. The model contains 3 types of parameters : Known parameters Calculable parameters Unknown parameters These parameters are given by the constructor or can be directly measured on the device. This is the case for the builtĀ­in volume ratio for example. These parameters don't have to be identified. These parameters can be evaluated. This is the case for the ambient losses heat transfer coefficient for example. These parameters are not given and can't be calculated. This is the case for the coefficient of the wall fictitious heat transfer for example. Those parameters have to be identified from the measurements. The known parameters are fixed to their value, and the calculable and unknown parameters are identified to make the predicted values fit to the measurements results. 79

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