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 Figure 51: Block diagram of the global model of the cycle Each component is supposed to impose one or several outputs : ● the pump imposes the refrigerant flow rate, ● the expander imposes the evaporator exhaust pressure and the condenser supply temperature, ● the evaporator imposes the refrigerant overheating and the pump exhaust pressure, ● the condenser imposes the expander exhaust pressure and the pump supply pressure. The prediction of the output shaft power by the global model is shown in figure 52. For points 22, 24, 35, and 36, the model did not converge. Those points are thus not represented on the figure. With the exception of the two points circled in red, figure 52 shows a maximum error of 20,1% between the two values. The 2 points correspond to the tests in which a high refrigerant charge was introduced, and in which a bad prediction of the pressure by the condenser model was detected (see figure 43). Figure 52: Predicted vs measured shaft power, cycle model 100

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