Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole
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...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20090015377 2023-05-15T18:22:04+02:00 Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole Freeh, Joshua E. Unclassified, Unlimited, Publicly available March 2009 application/pdf http://hdl.handle.net/2060/20090015377 unknown Document ID: 20090015377 http://hdl.handle.net/2060/20090015377 No Copyright CASI Spacecraft Propulsion and Power NASA/TM-2009-215506 AIAA Paper-2008-7810 E-16669 Space 2008 Conference and Exposition; 9-11 Sep. 2008; San Diego, CA; United States 2009 ftnasantrs 2019-07-21T01:23:07Z 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. Other/Unknown Material South pole NASA Technical Reports Server (NTRS) South Pole |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Spacecraft Propulsion and Power |
spellingShingle |
Spacecraft Propulsion and Power Freeh, Joshua E. Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole |
topic_facet |
Spacecraft Propulsion and Power |
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. |
format |
Other/Unknown Material |
author |
Freeh, Joshua E. |
author_facet |
Freeh, Joshua E. |
author_sort |
Freeh, Joshua E. |
title |
Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole |
title_short |
Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole |
title_full |
Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole |
title_fullStr |
Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole |
title_full_unstemmed |
Analysis of Stationary, Photovoltaic-based Surface Power System Designs at the Lunar South Pole |
title_sort |
analysis of stationary, photovoltaic-based surface power system designs at the lunar south pole |
publishDate |
2009 |
url |
http://hdl.handle.net/2060/20090015377 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
CASI |
op_relation |
Document ID: 20090015377 http://hdl.handle.net/2060/20090015377 |
op_rights |
No Copyright |
_version_ |
1766201411699212288 |