Both types of plants tend to ramp up and down fairly rapidly when there is sufficient DNI, partly as a function of other operational characteristics, such as some degree of natural gas augmentation to manage heat transfer fluid temperatures for start-up or during transient cloud conditions. The positioning of parabolic troughs is optimized to maximize production during the summer months power towers with tracking heliostats are better able to shape production smoothly across the year. In terms of production profiles, for different types of CSP plants without thermal storage (or hybridization with other fuels), production is differentiated primarily in terms of seasonal capability. 7 The studies reviewed in this chapter evaluate the economic benefits of the two primary commercialized designs: the parabolic trough and the tower. There are several different CSP plant designs, which are surveyed in and other sources. Unlike PV plants, CSP plants need high direct normal insolation (DNI) to achieve desirable operating efficiencies hence, they are, with a few exceptions, only built in such regions. Udi Helman, in Renewable Energy Integration, 2014 2.2 CSPĬSP plants use mirrors or other reflective surfaces to heat a working fluid, which then heats steam to operate a conventional generation power block with a steam turbine. Economic and Reliability Benefits of Large-Scale Solar Plants
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