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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1 Introduction The goal of this study is to develop a new pathway towards resurrecting and commercializing Solar Trough power plants. There are several organizations that are pursuing the development of large Solar Trough based steam plants (100 megawatts or larger). This study examined whether there is a pathway to success that uses smaller, modular, solar trough based power plants as an alternate approach to large central plants. This report fulfills the requirements of Subcontract No. NAA-1-30441-05 between the National Renewable Energy Lab (NREL) and Reflective Energies. Previously, Reflective Energies had developed a concept known as STORES (Solar Thermal Organic Rankine Electricity System), as part of an earlier subcontract with NREL. Under that earlier effort, it was found that the STORES concept had much potential but that several issues were still to be resolved. The current work is known as the STORES Stage I study, with the goal of developing an optimized ORC Power cycle, a conceptual design and cost estimate for a STORES system, and a preliminary assessment of the market potential, and setting the stage for the first STORES demonstration plant. The objectives of the work are as follows: 1) develop an optimized ORC power cycle for integration with a parabolic trough solar field, 2) develop a conceptual design and cost estimate for a 10 MWe STORES system, 3) conduct a performance and economic assessment of initial and mature STORES plants, 4) conduct preliminary assessment of STORES market potential, and 5) identify next steps towards a demonstration or early commercial STORES project. 2 Scope of Work The Scope of Work for this subcontract is shown below: • A comparison of steam Rankine and organic Rankine power cycles • An evaluation of heat rejection options for ORC systems • An assessment of working fluids for the solar field and ORC systems • The optimization of organic Rankine power cycles for solar resource temperatures • Detailed conceptual ORC power plant design • Development of an optimized solar field and power plant 1

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