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148 Storage as Load leveler One use of storage in a fixed-rate pricing structure is to maintain powerplant operation at its maximum efficiency point throughout the solar day. In order to investigate the possible advantages of this operating strategy, the simulation models of both the APS ORC plant presented in this thesis and the SEGS VI plant developed by Patnode [2006] were run to examine the variation in plant efficiency at constant HTF supply temperature for varying flow rates. The results are shown in Figure 7.9 where reduced efficiency is the ratio of efficiency to full-load efficiency and reduced mass flow rate is the ratio of mass flow to full-load mass flow. Figure 7.9: The change in cycle efficiency as a function of HTF flow rate for the SEGS VI and APS solar-thermal powerplants. The benefit of a load-leveling operating strategy depends on plant efficiency being a strong function of load (HTF flow rate). That is, the gain in plant efficiency from load- leveling must offset storage system cost. In the case of both plants, efficiency is a weak function of HTF flow rate indicating that with the exception of extremely low HTF flow rates there is no intrinsic advantage to maintaining a constant power cycle operating point. The apparent independence of cycle efficiency and part-load HTF flow rate is driven by competing effects which cancel one another. As HTF flow rate decreases, turbine efficiency decreases while heat exchanger effectiveness increases.PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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