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Preliminary Designs For 25 kWe Advanced Stirling Conversion Systems For Dish Electric Applications

Under the Department of Energy's (DOE) Solar Thermal Technology Program, Sandia National Laboratories is evaluating heat engines for terrestrial Solar Distributed Heat Receivers. The Stirling engine has been identified by Sandia as one of the most promising engines for terrestrial applications. The Stirling engine also has the potential to meet DOE's performance and cost goals. The NASA Lewis Research Center is conducting Stirling engine technology development activities directed toward a dynamic power source for space applications. Space power systems requirements include high reliability, very long life, low vibration and high efficiency. The free-piston Stirling engine has the potential for future high power space conversion systems, either nuclear or solar powered. Although both applications appear to be quite different, their requirements complement each other. NASA Lewis is providing management for the Advanced Stirling Conversion System (ASCS) Project through a cooperative Interagency Agreement with DOE. Parallel contracts were completed in December 1989 by Cummins Engine Company (CEC) of Columbus, Indiana and Stirling Technology Company (STC), Richland, Washington for the preliminary designs of an ASCS. Each design features a free-piston Stirling engine, a liquid metal heat transport system, and a means to provide nominally 25 kW of electric power to a utility grid while meeting DOE's performance and long term cost goals. The Cummins design incorporates a linear alternator to provide the electrical output, while the STC design generates electrical power indirectly through a hydraulic pump/motor coupled to an induction generator. Both preliminary designs for the ASCS's will use technology which can reasonably be expected to be available in the,early 1990's.