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86 power cycle design for solar applications it is clear that neither of these designs are thoroughly optimized. The approach temperature in both superheaters is relatively large. In addition, they both suffer severe pinch-points where the working fluid begins to boil. These pinch-points result in very poorly matched capacitance rates in the HTF and WF. These observations indicate that toluene was a poor working fluid choice for a 300oC thermal resource. The large latent-heat of toluene in the temperature and pressure ranges achievable with a 300oC resource prohibit capacitance rate matching to the degree seen in Figure 5.12. Working fluid selection is an important part of optimal solar power cycle design as it enables fully optimized cycle configurations. Powerplant designers must consider the ability of their working fluid to conform to their thermal resource. Figure 5.12: Heating and cooling curves for two parabolic trough solar powerplant designs using Toluene as the working fluid and a 300oC thermal resource. 5.4 Conclusions Finite-time thermodynamics offers a versatile framework for evaluating generalized optimization strategies for traditional powerplants. When properly modified for the consideration of solar-thermal powerplants it provides a convenient way of estimating the optimum design of these plants that considers the fundamentally coupled performance of the solar field and power cycle. This analysis demonstrates why traditional powerplant design favors maximum power operation and solar-thermal powerplant design favors maximum efficiency operation. It is important to understand the relative weighting ofPDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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