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Lunar Power Peaks Rajeev Shrestha ASTE 527. Rajeev ShresthaDec 15, 2008Lunar Power Peaks Power requirements SystemBuild-Up Phase (kW) Fully Operational.

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Presentation on theme: "Lunar Power Peaks Rajeev Shrestha ASTE 527. Rajeev ShresthaDec 15, 2008Lunar Power Peaks Power requirements SystemBuild-Up Phase (kW) Fully Operational."— Presentation transcript:

1 Lunar Power Peaks Rajeev Shrestha ASTE 527

2 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Power requirements SystemBuild-Up Phase (kW) Fully Operational (kW) Source Habitat50280Nuclear reactor Rovers/Infrastr./ ISRU 300140Fuel cells Comm./Telerob./ Outreach 1530Photovoltaic Observatories/ Geology 1550Photovoltaic Total380500 Total w/50% margin570750 Sources: 2006 International Space University Study, 2005 NASA Glenn Report (Kerslake)

3 Source: U.S. Geological Survey MM Shackleton 400 km 150 km

4 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Concept Laser transmitters and photovoltaic receivers No towers, no cables Power from central base to outposts, mobile assets Receivers double as backup solar collectors

5 Rajeev ShresthaDec 15, 2008Lunar Power Peaks LASER Source: Jefferson Lab

6 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Horizon R = 1738 km Case 1: Peak-to-ground v1 = 8 km v2 = 0 km Max line of sight = 167 km Case 2: Peak-to-peak v1 = 8 km v2 = 8 km Max line of sight = 334 km

7 MM Shackleton 300 km 175 km 200 km 150 km Source: U.S. Geological Survey MM Shackleton

8 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Power Beaming: Old News? 1968: SSP (Glaser) 1991: SELENE 2008: Mankins Experiment 2008: Powerbeam Difference No satellites Not solar Not from Earth kW not GW Distance (efficiency 1/r^2) Microwave power transmitters from Mankins’s experiment in May 2008.

9 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Issues Size Mass Not TRL 9 Installation on “peaks” Interference

10 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Future Applications Global network Beaming to Earth Beaming to spacecrafts

11 Rajeev ShresthaDec 15, 2008Lunar Power Peaks References Bussey, et al. Lunar Polar Illumination What We Know & What We Don’t. The Johns Hopkins University Applied Physics Laboratory. Nov 2004. D. Cooke. Exploration System Mission Directorate: Lunar Architecture Update. AIAA Space 2007. 20 Sept 2007. International Space University. Luna Gaia: A closed loop habitat for the moon. 2006. Mckay, McKay, and Duke. Space Resources: Energy Power and Transport. Lyndon B. Johnson Space Center. 1992. P. D. Lowman Jr., B. L. Sharpe, and D. G. Shrunk. Moonbase Mons Malapert? Aerospace America. Oct. 2008. R. J. De Young et al. Enabling Lunar and Space Missions by Laser Power Transmission. NASA Langley Research Center. T. W. Kerslake. Electric Power System Technology Options for Lunar Surface Missions. NASA Glenn Research Center. April 2005.

12 Backup Slides

13 Rajeev ShresthaDec 15, 2008Lunar Power Peaks South Pole Illumination Source: JHU/APL (Bussey et al.)

14 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Distances Efficieny 1/r^2 Earth to Moon: 360,000 – 410,000 km Earth GEO: 36,000 km Min. orbit altitude for space-based power beaming on Moon: 5000 km 4 –Lunar synchronous: 90,000 km Dist. b/t Shackleton & Schrodinger: <400 km Dist. b/t Shackleton & Mons Malapert: ~150 km Mankins experiment: 148 km

15 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Energy Storage Lithium-ion battery (90 kW-hr/kg) Hydrogen fuel cells –Proton Exchange Membrane (PEM) Regenerative Fuel Cells (RFC) 1 –412 kW-hr/kg –Expensive –Insufficient TRL

16 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Power Generation Habitat: nuclear fission (depending on power requirements) –Nuclear: radiation protection Nearside observatory at Mons Malapert (light): photovoltaic Shackleton observatory (helio-observatory) Farside Infrared observatory in Schrodinger (in dark crater): power beaming to w/backup from fuel cells Rovers: fuel cells recharged by power beaming Construction: combustion w/photovoltaic or nuclear from main

17 Rajeev ShresthaDec 15, 2008Lunar Power Peaks Benefits If nuclear based then save weight on inefficient solar cells Provide power to infrared telescope w/o cables Provide backup power to Shackleton during periods w/o sunlight Provide backup power to rovers Provide large scale testing of a power beaming system for future use on Earth or lunar global network Less power loss than cables –No air to insulate bare wires –Lunar soil has high iron concentration so can’t bury cables –Need to make insulated conduits Less mass than 300 km + cables

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