Fundamental differences between the optimization strategies for power cycles used in “traditional” and solar-thermal power plants are identified using principles of finite-time thermodynamics. Optimal operating efficiencies for the power cycles in traditional and solar-thermal power plants are derived. In solar-thermal power plants, the added capital cost of a collector field shifts the optimum power cycle operating point to a higher-cycle efficiency when compared to a traditional plant. A model and method for optimizing the thermoeconomic performance of solar-thermal power plants based on the finite-time analysis is presented. The method is demonstrated by optimizing an existing organic Rankine cycle design for use with solar-thermal input. The net investment ratio (capital cost to net power) is improved by 17%, indicating the presence of opportunities for further optimization in some current solar-thermal designs.
A Finite-Time Thermodynamic Framework for Optimizing Solar-Thermal Power Plants
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McMahan, A., Klein, S. A., and Reindl, D. T. (January 22, 2007). "A Finite-Time Thermodynamic Framework for Optimizing Solar-Thermal Power Plants." ASME. J. Sol. Energy Eng. November 2007; 129(4): 355–362. https://doi.org/10.1115/1.2769689
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