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80 Table 5.1 Optimization Results Metric Heat Exchanger Area, m2 Solar Field Area, m2 Reference Optimized 2540 2670 6606 5045 NIR 100 83 Availability Destruction, kW 925 571 Cycle Efficiency 19.3 25.3 Net Power, kW 1081 1081 Table 5.2 Heat exchanger allocation, % Heat Exchanger Reference Optimized Preheater 5.6 7.2 Evaporator 1.3 1.8 Superheater 3.7 22.0 Recuperator 12.6 41.0 Desuperheater 14.0 3.0 Condenser 62.8 25.0 NIR was improved 17% as a result of the optimization at the cost of a 5% increase in power cycle heat exchanger size. The increase in gross cycle efficiency and subsequent decrease in required solar field size is the driving force for the improved NIR. This result demonstrates that cycle efficiency, achieved at the cost of additional power cycle heat exchanger area, results in substantially improved NIR. Efficiency could be further increased by additional power cycle investment, but the reduction in solar field size would be insufficient to account for the added power cycle cost. Figure 5.9 and 5.10 show heating and cooling curves for the reference case and the optimized cycle. The optimized case dramatically improves the heat addition process by reducing approach temperatures at both the inlet and exit as well as improving capacitance rate matching, approaching the ideal cycle shown in Figure 5.5. This improvement in heat addition is responsible for the nearly 50% reduction in availability destruction seen in the optimized cycle design.PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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