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An existing software tool for annual performance calculation of concentrating solar power and other renewable energy plants has been extended to enable the simulation of solar tower power plants. The methodology used is shown and a demonstrative example of a 50 MWf tower plant in southern Spain is given. The influence of design power and latitude on solar field layout is discussed. Furthermore, a comparison of the tower plant with a 50 MWe parabolic trough and a Linear Fresnel plant at the same site is ^iven

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While the positive effect of raising turbine inlet temperature to increase overall plant efficiency is often quoted and discussed, another figure is mentioned to a much lesser extent: The HTF outlet temperature at the steam generator exit, which also has a profound influence on cycle efficiency due to the fact that allowing higher temperatures allows moving to much higher evaporator pressures and, thus, higher cycle efficiencies. This paper aims at evaluating potential benefits of increasing the lower HTF temperature in molten salt parabolic trough power plants based on an evaluation of its influence on LCOE.

Abstract. Collectors with a high optical quality are generally valued for their additional performance, i.e. the expected additional output due to the performance gain compared to a lower quality reference collector. However, highperformance collectors additionally have a lower sensitivity to additional optical errors and, thus not only perform better nominally, but are also more likely to reach their nominal performance even when project uncertainties (e.g. increased sun-shape) or quality issues (e.g. increased component optical error) degrade their performance. This has physical reasons, whose cause and effect will be described and quantified within this paper.