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Organic Rankine Cycle Solar-Thermal Powerplants

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Organic Rankine Cycle Solar-Thermal Powerplants ( organic-rankine-cycle-solar-thermal-powerplants )

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Figure 7.12: TRNSYS simulation output for a single day using no storage, the variable-price control strategy, and the fixed-rate control strategy. The total energy outputs for the operating strategies shown in Figure 7.12 are shown in Table 7.1: Table 7.1: TRNSYS Simulation Summary Operating Mode No Storage V ariable-Rate Fixed-Rate Integrated Output (MW-hr) 349 329 369 The variable-rate control strategy produces less energy than the no-storage case because at very large flow rates the power cycle is able to absorb less of the energy delivered to it. These high flow rates then result in higher solar field return temperatures and larger solar field losses. The fixed-rate control strategy produces more energy than the no-storage case because the plant was operated continuously at an output where cycle efficiency was high and solar field return temperatures were low. This creates a balance between solar field and power cycle efficiency, discussed in detail in chapter 5. Indirect Storage System Performance The efficiency of an indirect storage system is coupled directly to the effectiveness of the indirect heat exchanger, and the ability to match hot and cold fluid capacitance rates. Section 7.1 shows how system performance is theoretically coupled with heat exchanger 151

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