DOE/NASA Solar Thermal Concept (1980) In the NASA/DOE study all technologies were considered. As well as photovoltaics several thermodynamic conversion techniques were considered, but finally rejected by comparison with the final reference concept. Illustrated here are conceptual designs for Brayton and Rankine cycle satellites designed by Rockwell International. _____, Use of Space for Earth Power, Rockwell International, 1992 General Dynamics/NASA study of lunar resources for satellite construction (1980) This report outlines ways in which direct substitution of lunar materials for those in the NASA/DOE reference concept could reduce the cost of this satellite. Thus while the design is the same the economics and development plan for such a satellite are significantly different. Bock, E. et al, Lunar Resource Utilisation for Space Construction, vols 1-3, General Dynamics Convair, 1979 Rockwell Post-Contract IR&D A reevaluation of the NASA/DOE study conducted subsequently, this concept uses newer technologies (multiple bandgap solar cells, magnetrons) and significant quantities of lunar materials to produce 15.4GW on earth. _____, Use of Space for Earth Power, pp.22,Rockwell International, 1992 Pioneering the Space Frontier: Report of the President's Commission on Space (1986) A set of recommendations for future American activities in space. The report spoke favorably of the possibilities of future power from space. Pioneering the Space Frontier: Report of the President's Commission on Space, Bantam Books, 1986 Energy Storable Orbital Power Station (ESOPS) (1987) An ISAS/Toshiba concept for a ten MW space to earth space power satellite, ESOPS would fly in low earth orbit. Transmission would be for 35 minutes per revolution, with an orbital period of 144 minutes. Between transmission times the energy would be stored as heated fluid, with LiF used as the thermal transfer fluid for a Brayton cycle engine . Akiba, R. et al, A Concept of the Energy Storable Orbital Power Station (ESOPS), Acta Astronautica, vol 15 no 11, pp 893-900, 1987 The Synthesis Group Report This study considered four possible future paths for space activities, including the possible future industrialisation of space to provide power for earth. America at the Threshold, Synthesis Group
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