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3.3.2 Model Calibration Based on Manufacturer Predictions The plant was modeled using the techniques described in section 3.2 along with projected performance data provided by the manufacturer using EES [Klein, 2006]. Table 3.1 provides a detailed breakdown of the state points shown in Figure 3.15. Both manufacturer and model output temperatures and pressures for full-load operation are reported. The model correlates well with the manufacturers’ data at 100% load. The only discrepancies occur at state points 7 and 9, which are the intermediate states between the boiler and preheater. These discrepancies do not reflect a limitation in the model but rather they are a function of how the hot-side heat exchangers were modeled as explained in section 3.2. The model outputs in table 3.1 were achieved by calculating the required heat exchanger area (and corresponding UA) to develop the pinch point temperatures in the boiler, condenser and recuperator predicted by the manufacturer at design conditions. Pump and turbine efficiencies were extracted from manufacturer’s documents [Price, 2006]. All cycle state-points not based on manufacturer data are functions of the component performance models. Table 3.1 APS plant 100% load state point summary 39 State # 1 2 3 4 5 6 7 8 9 10 11 12 State Name Turbine Inlet Recuperator Inlet Condenser Inlet Pump Inlet Recuperator Inlet Preheater Inlet Boiler Inlet HTF inlet HTFpreheaterinlet HTFreturn CW inlet CW return Fluid Manufacturer Model [C] [kPa] [C] [kPa] 204.4 2227 204.5 2227 133.3 81 133.3 81 57.7 74 57.7 74 - - 23.3 62 24.4 2289 24.4 2289 86.9 2268 85.6 2268 148.9 2227 169.7 2227 20 - 24.3 - n-Pentane n-Pentane n-Pentane n-Pentane n-Pentane n-Pentane n-Pentane XCELTHERM®600 300 XCELTHERM®600 186.2 XCELTHERM®600 120 Water 20 203 Water 24.3 143 313 300 - 263 211 - 104 119.9 -PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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