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APPENDIX A Statement of Work “Development of Advanced Models for Supercritical Carbon Dioxide Power Cycles for use in Concentrating Solar Power Systems” June 1, 2010 1.0 BACKGROUND The National Renewable Energy Laboratory (NREL) developed and maintains an integrated solar technologies analysis software tool. This tool allows NREL, outside researchers, and industry to examine the solar system impacts of various cost, financing and performance decisions and tradeoffs across all solar technologies including Concentrating Solar Power (CSP), PV and solar heat. This project is a multi- year effort at NREL. This tool is currently known as “Solar Advisor Model” or SAM. An existing transient renewable energy system simulation engine, TRNSYS, is used for most of the system performance calculations within SAM. The TRNSYS engine was chosen because of the extensive existing solar modeling content within TRNSYS for all relevant technologies, the general acceptance of TRNSYS within the solar modeling community, its flexibility and modularity and the fact that it can be re-distributed freely once incorporated into SAM. Separately and additionally, the DOE CSP program needs to continue to develop performance models for new and emerging CSP technologies in order to assess the potential of these technologies. The NREL goal is to incorporate models within SAM that allow for analysis of proposed and developing technical advances. One such advanced technology is the supercritical carbon dioxide (s-CO2) Brayton power cycle. Accordingly, NREL seeks a Subcontractor to develop realistic performance models of the s-CO2 Brayton cycle that can be programmed in TRNSYS for use in SAM. The successful Subcontractor must have experience in CSP technologies; a thorough understanding of thermal power cycles, especially related to s-CO2; and the ability to program in TRNSYS. Current research on s-CO2 cycles has been focused on reviewing and modeling variations of the basic Brayton cycle that are possible for supercritical CO2 systems, as reported in Dostal (2006). Models for the regenerative, precompression, recompression, and split expansion systems have been developed using accurate thermodynamic and transport property data for carbon dioxide and rigorous heat exchanger models that account for property variations with pressure and temperature using a finite difference approach. The research completed thus far has confirmed model output versus literature references and optimized power and efficiency of the cycle variations. References Mike Wagner, “Simulation and Predictive Performance Modeling of Utility-Scale Central Receiver System Power Plants”, M.S. thesis, University of Wisconsin, Madison, 2008. Vaclav Dostal, Pavel Hejzlar, Michael J. Driscoll, “High-Performance Supercritical Next-Generation Nuclear Reactors”, Nuclear Technology Vol. 154, pp. 265-282, June 2006. Vaclav Dostal, Pavel Hejzlar, Michael J. Driscoll, “The Supercritical Carbon Dioxide Power Cycle: Comparison to Other Advanced Power Cycles”, Nuclear Technology Vol. 154, pp. 283-282, June 2006. 1PDF Image | Supercritical CO2 Power Cycles for Use in Concentrating Solar Power
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