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Initial routine operation was hampered by recurring incidences of known issues, particularly failure of the compressor short-circuit valve. This valve bypasses the gas compressor, allowing it to “idle” when not needed. The valve is an internally piloted valve providing a large flow area. The fluctuating flow field of the compressor appears to accelerate wear in the valve. SNL has begun testing several valve options, with great initial success. We have also begun characterizing the pressure drop through the valve, helping to determine suitable COTS valves available for mass production and substantial cost savings. It appears the large flow area on the original valve is oversized by several orders of magnitude. Initial operation with several valve options has been trouble free, and all six dishes are now operational. Other reliability issues have centered on the PCU control system, which is an old design. We have helped design and install short- term fixes to improve the noise rejection. SES is building a team to modernize the controller, which will reduce the parts count, provide programming flexibility, and greatly improve reliability. 4. Planned FY 2006 Activities SES and SNL have successfully installed and begun operating a six-dish MPP to demonstrate the technology, develop new components and methods, and improve reliability in preparation for larger deployments. SES has developed agreements with California utilities for up to nearly 2 GW of installed capacity. The systems have brought unprecedented publicity to both the CSP Subprogram and SES, culminating in a visit by President Bush in August 2005. SES is continuing an aggressive schedule for product improvement and deployment. The company will next install a 1-MW (40-dish) system, followed by high-rate production. The involvement of high-production suppliers and the national laboratories in the deployment of the MPP and the 1-MW plant is key to transitioning to production. The systems are performing at expected efficiency and power production levels, which helps firm up predictions for large plant production. Initial reliability has been impacted by several known problems. SNL and SES have applied engineering resources to these problems, implemented short- term fixes to the MPP, and outlined development paths for the production version. The partnership between SNL and SES is a new way of doing business that maximizes the benefit to SES while continuing to leverage the expertise developed at the national laboratories. During FY 2006, we will: Continue to operate the six-dish system, and evaluate performance and identify reliability issues The systems have accumulated 1,734 dish-hours of operation so far, which is expected to increase rapidly in the next fiscal year. To reduce risk to limited assets, most dish operation is limited to attended operation. The systems have performed well, with indicated efficiencies similar to the record of 29.4% net. We are installing and calibrating NIST-traceable instruments for power and solar resource to accurately determine system and field performance. We fully expect improved performance versus the MDC systems, based on • the improved alignment strategy and improved glass reflectivity (low-iron glass). SNL has worked closely with SES to develop improved data, information, and control handling and systems. SES is leading a program to update the Supervisory Control and Data Acquisition system to provide graphical interfaces, historical online data, and efficient field communications. This system is database-driven and will provide views suitable for operators (simple), managers (summary), and engineers (highly detailed). In addition, SNL has continued to develop procedures and tools for capturing human interactions (electronic logbook) and documenting safe operational procedures. The larger number of systems requires diligent efforts to capture and catalog issue areas that will lead to product improvement. Solar Thermal R&D Concentrating Solar Power • Start to resolve known issues (e.g., gas- management valve) • Define initial, baseline system performance and reliability • Support SES as it starts to deploy a 1-MW power plant. REFERENCES [1] Lloyd J.L., “SES Stirling Engine Frame and Heat Exchanger Redesign,” Solar Program Review 2005, Denver, Nov. 7-10, 2005. [2] Romero V.J., "CIRCE2/DEKGEN2: A Software Package for Facilitated Optical Analysis of 3-D Distributed Solar Energy Concentrators – Theory and User Manual," SAND91-2238, Feb 1,1994. 112PDF Image | DOE Solar Energy Technologies Program
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