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140 m ψ and m ψ are the availability flows out of a in to the indirect storage system heat out out in in exchanger during a given mode of storage system operation. This efficiency definition conveniently captures availability destruction that occurs as a result of indirect storage system integration. Fluid specific heats are assumed constant, fluid was delivered from the solar field at 400oC and cold stream inlet temperatures were assumed to be 300oC (both from storage and from the power cycle). Mass flow rates are calculated such that the capacitance rates of both fluids are matched. Only heat exchanger irreversibilities are considered, the storage tank itself is “perfect.” Figures 7.2 and 7.3 show the results of applying equation [7.1.1] to fully-indirect storage and semi-indirect storage for both charge-discharge and storage bypass operation. Second law efficiency is displayed as a function of heat exchanger NTU. Semi-indirect storage provides better overall storage system performance during charge-discharge operation as the heat exchanger is utilized only once where fully-indirect storage must use the heat exchanger both while charging and discharging. Similarly, Fully-indirect storage provides better performance during storage bypass operation, as the heat exchanger is bypassed completely where the semi-indirect configuration still utilizes the heat exchanger once. Figure 7.2: Net Second Law heat exchanger efficiency as a function of heat exchanger NTU for a charge cycle followed by a discharge cycle assuming perfect storage.PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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