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Compressor pressure ratio, rAC 10 Compressor isentropic efficiency, ηAC 0.83 Gas turbine inlet temperature, GTIT (K) 1400 Gas turbine isentropic efficiency, ηGT 0.88 HRSG low pressure, PLP (bar) 3 HRSG high pressure, PHP (bar) 20 Low pressure pinch point PPLP (0C) 10 Pump isentropic efficiency, ηPump 0.78 ORC evaporator pinch point, (o C) 10 ORC condenser pressure, PCond (kPa) 90 ORC turbine inlet pressure, PORC (kPa) 700 ORC extraction pressure, Pex,ORC (kPa) 220 ORC evaporator pressure, (kPa) 25 PEM temperature, TPEM (0C) 80 PEM electrolyzer thickness, D (𝝻m) 100 Table 6.1: Input parameters used to model the system. Parameter Value Parameter Val ue High pressure pinch point PPHP (0C) 10 Chiller weak solution concentration 57.6 chiller evaporator temperature, (o C) 5 Chiller strong solution concentration 58.2 P0 (kPa) 101 0.80 T0 (0C) 25 Steam turbine isentropic efficiency, ηST Condenser pressure, PCond (kPa) 10 Specifically, the electrochemical model is used to simulate experiments published in the literature and the modeling results and experimental data are compared. The electrolyte used in the experiments [114, 115] is Nafion, a polymer widely used as electrolyte in fuel cells and electrolyzers. The thicknesses of the electrolytes tested by Ioroi et al. [114] and Millet et al. [115] were 50 𝝻m and 178 𝝻m, respectively. Platinum was used as the electrode catalyst. The simulation code for the J–V characteristics for PEM electrolysis are compared with experimental data of Ioroi et al. [114] as shown in Fig. 6.1. The modeling results agree well with the experimental data, supporting the validity of the present simulation. It is found that the cell potential increases rapidly when current density is less than 300 A/m2. When J exceeds 300 A/m2, the cell potential increases slightly with J. To enhance the understanding of the electrochemical performance of the PEM electrolyzer, ohmic and activation overpotentials are examined and shown individually in Fig. 6.2. This figure shows that the ohmic overpotential is very small and increases slightly with current density. This observation is attributable to the fact 116PDF Image | Energy Systems for Multigeneration Purposes
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