| Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole Contributor(s): Administration (Nasa), National Aeronaut (Author) |
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ISBN: ISBN-13: 9798670071611 Publisher: Independently Published OUR PRICE: $26.99 Product Type: Paperback Published: July 2020 * Not available - Not in print at this time * |
| Additional Information |
| BISAC Categories: - Science | Space Science |
| Physical Information: 0.05" H x 8.5" W x 11.02" (0.19 lbs) 26 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: Combinations of solar arrays and either batteries or regenerative fuel cells are analyzed for a surface power system module at the lunar south pole. The systems are required to produce 5 kW of net electrical power in sunlight and 2 kW of net electrical power during lunar night periods for a 10-year period between 2020 and 2030. Systems-level models for energy conservation, performance, degradation, and mass are used to compare to various systems. The sensitivities of important and/or uncertain variables including battery specific energy, fuel cell operating voltage, and DC-DC converter efficiency are compared to better understand the system. Switching unit efficiency, battery specific energy, and fuel cell operating voltage appear to be important system-level variables for this system. With reasonably sized solar arrays, the regenerative fuel cell system has significantly lower mass than the battery system based on the requirements and assumptions made herein. The total operational time is estimated at about 10,000 hours in battery discharge/fuel cell mode and about 4,000 and 8,000 hours for the battery charge and electrolyzer modes, respectively. The estimated number of significant depth-of-discharge cycles for either energy storage system is less than 100 for the 10-year period. Freeh, Joshua E. Glenn Research Center NASA/TM-2009-215506, AIAA Paper-2008-7810, E-16669 WBS 342806.06.03.03 SOLAR ARRAYS; FUEL CELLS; ELECTRIC BATTERIES; SPACECRAFT POWER SUPPLIES; SYSTEMS ENGINEERING; LUNAR BASES; ELECTRIC POWER TRANSMISSION; VOLTAGE CONVERTERS (DC TO DC); NIGHT; ILLUMINATING; ENERGY CONSERVATION; DEGRADATION; POWER EFFICIENCY; MATHEMATICAL MODELS |