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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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62 addition of turbine-reheat. Although pressure drops will exist in a real system, it is conceivable that with careful recuperator design a toluene ORC could remain close to the performance of SEGS VI steam cycle. While organic Rankine cycles using toluene can approach the efficiency of the SEGS VI steam cycle, they do so while sacrificing some of their fundamental advantages. Condenser operating pressures corresponding to 40oC operation are sub-atmospheric (10 kPa). In addition to added O&M, these low condensing pressures correspond to larger turbine pressure ratios, potentially complicating turbine design. Despite the sacrifices necessitated by this operating range, the organic Rankine cycle still represents a reduction in overall powerplant complexity as there is no extensive feedwater heating system. The high operational efficiency and established market of the steam Rankine cycle makes it unlikely that organic Rankine cycles will compete for large-scale electricity generation. In addition, advances in concentrating solar collector design and operation could allow cycle operation at temperatures wholly unattainable by existing organic fluids [Kearney et al, 2003]. However, the comparable thermodynamic performance and simplicity of organic Rankine cycles makes high-efficiency, low-output, and low-maintenance solar power generation a more attractive investment. If an organic Working fluid was developed that retained all the advantages of a low-temperature n-pentane cycle during higher temperature operation organic Rankine cycles would be an even more attractive option for solar power generation.

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