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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Figure 7.3: Net Second Law heat exchanger efficiency as a function of heat exchanger NTU when storage is bypassed in favor of power generation. The fact that neither the fully-indirect or semi-indirect storage configuration is always more efficient implies that a compromise must be made during design. Requiring such a compromise assumes that it is not practical to have a power cycle which could receive thermal energy from both the heat transfer fluid and storage fluid. Were such a cycle possible, the better performing configuration could be utilized during both charge- discharge and bypass operation. Assuming again that either fully-indirect or semi- indirect storage are the only practical considerations, it follows that plant design must consider operating strategies when determining storage system integration. Storage Fluid Selection – Pumping Loads Indirect storage implies the presence of a secondary storage fluid and flow loop. As part of evaluating candidate storage fluids, it is essential to consider the parasitic pumping associated with them. The parasitic load for a thermal storage system can be considered by comparing the pumping load relative to the amount of thermal energy stored. Consider Rstore, the ratio of parasitic energy loss to energy stored: & R = Eparasitic [7.1.3] store & Estore where E¶sitic is the ideal pump work and E&store is the change in thermal energy of the 141

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