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Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics

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Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics ( solar-trough-organic-rankine-electricity-system-stores-stage )

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The most efficient cycle for an HTF temperature of 560oF is the steam/butane cycle followed closely by the benzene/butane and toluene/butane cycles. For the reasons mentioned above, the ORC would be the preferred topping cycle. The slight thermodynamic advantage of steam would not compensate for its other disadvantages. In all cases, recuperated cycles are significantly more efficient than the non-recuperated cycles. Fluids and Cycle Digest Of the potential organic working fluids reviewed in this study, only the aromatic hydrocarbons have sufficient thermal stability to be used as the topping cycle working fluid in a cascade solar thermal power plant. Light hydrocarbons such as butane have sufficient thermal stability to be used as bottoming cycle working fluids. The most efficient solar organic rankine cycle is the recuperated orthoxylene/butane cascade cycle with a net efficiency of 30.5% and a gross efficiency of 36.0%. However, considering thermal stability, availability, and prior experience, the toluene/butane cascade cycle, with almost the same efficiency, would be the recommended choice. This cycle offers high thermal efficiency over a range of HTF temperatures. The recuperated cascade cycle is the most thermally efficient organic rankine cycle. The best organic rankine cycles, even with recuperation, are less efficient than extraction steam cycles. However, they have other advantages which allow for lower operation and maintenance, making them suitable for small installations (1-10 MW). 26

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