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This analysis suggests that there is not a significant benefit from using storage in a solar powerplant operating in a fixed-rate pricing structure. In general this appears to be true; however an alternative case for using storage in a system operating within a fixed-rate pricing structure has been proposed [Price, 2006]. It suggested that thermal-energy storage be used as a retrofit to an existing plant, in combination with additional solar field, to extend the operating interval of an existing powerplant. In this case, the existing power cycle could not handle the increased thermal output of the expanded solar field. Storage would then be used to capture this excess thermal energy for use during periods of lower insolation. 7.3 Sample TRNSYS Simulations TRNSYS is the simulation environment of choice for solar energy technologies. In this section the basic layout and use of TRNSYS employing the models developed in this thesis is presented. The simulation of a solar-thermal powerplant with storage in TRNSYS is based on 5 core TRNSYS component models. Type 805 is a parabolic-trough solar field model developed by Patnode [2006]. Type 811 is a Rankine cycle powerplant model based on SEGS VI, also developed by Patnode [2006]. Type 994 is the packed-bed stratified storage model developed in this thesis, described in Appendix B. Type 998 is a heat exchanger model developed specifically for the simulation of indirect storage systems. Type 998 is described in detail in Appendix C. Figure 7.10 and Figure 7.11 show the layout of a parabolic-trough Rankine cycle powerplant with direct and fully-indirect storage in the TRNSYS Simulation Studio [Klein et al, 2006]. 149PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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