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Lunar Lander Power Systems

Lunar Lander Power Systems. Adham Fakhry Power Group Lunar Descent Phase. Solar cells for Lunar Lander. Ultraflex Solar cells . Ultra Triple Junction Cells. From Spectrolab Efficiency = 28.3% 330 W/m 2 , 400 $/ Watt (for 2kW – 5Kw range) 2.06 kg/m 2 Mass = 1.362 kg Power = 218 W

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Lunar Lander Power Systems

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  1. Lunar Lander Power Systems AdhamFakhry Power Group Lunar Descent Phase [Adham Fakhry] [Power Group]

  2. Solar cells for Lunar Lander Ultraflex Solar cells Ultra Triple Junction Cells From Spectrolab Efficiency = 28.3% 330 W/m2, 400 $/Watt (for 2kW – 5Kw range) 2.06 kg/m2 Mass = 1.362 kg Power = 218 W Area = 0.661 m2 Cost = $87,200 • From Able Engineering • Efficiency = 30% • 1000 $/Watt • 150 W/kg • Mass = 1.57 kg • Power = 236 W • Area = 0.78 m2 • Cost = $235,620 [Adham Fakhry] [Power Group]

  3. Battery for Lunar Lander [Adham Fakhry] [Power Group] • To survive a Lunar night, need 5 W for standby power • 145 W-hr/kg. Need 1680 W-hr to survive 14 days. • Need a 11.5 kg battery to meet this requirement, in order to survive the night. • Desired total mass of battery structure: 20 kg • (Insulation, Support Struts, Battery, Power Management and Distribution System) • Batteries obtained from Yardney – Technical Products.

  4. Backup Slide 1: Solar Array Grid 1.0 m 0.113 m 0.357 m 0.7071 m 0.7071 m [Adham Fakhry] [Power Group]

  5. Backup Slide 2: Power Sys. Prop. [Adham Fakhry] [Power Group]

  6. Backup slide 3: Battery Sizing [Adham Fakhry] [Power Group] • Calculation for battery: • Need 5 W for standby power • Mass Battery = 145 W-hrs/kg • Days of use = 14 days = 336 hrs • Usage = 5 X 336 = 1680 W-hrs • Mass = 1680 / 145 = 11.6 kg • Battery needs power distribution system, for managing power and dropping the voltage for other systems, such as camera, coolers, etc.

  7. Backup slide 4: Solar Array sizing [Adham Fakhry] [Power Group] • Solar array Calculations: • Dimensions of Solar cells: • Area of Lander roof = π(1/2)2 = 0.785 m2 • Solar efficiency = 300 W/m2 • Potential max power = 235.6 W • Cost of Solar Cells: • Cost of cells per watt = 1000 $/W • Cost of Cells = 235,619.45 = $235,600

  8. Backup slide 5: Solar Array sizing 2 [Adham Fakhry] [Power Group] • Solar array Calculations: • Dimensions of Solar cells: • Total area = 0.661 m2 • Weight /area = 2.06 kg/m2 • Total weight = 1.362 kg • Cost of Solar Cells: • Cost of cells per Watt = 400 $/W • Cost of Cells = $ 87,200

  9. Backup slide 6: Cost per block [Adham Fakhry] [Power Group] • Solar array Calculations: • Cost of Solar Cells: • Cost of cells per block: $300 per block • Block sizes range from 26.62 cm2 to 29.85 cm2 • Average number of blocks = 360 • Total cost of solar cells = 70,200

  10. Backup slide 7: Potential Power [Adham Fakhry] [Power Group]

  11. Backup slide 8: References [Adham Fakhry] [Power Group] • References: • http://www.yardney.com/ • http://nmp.jpl.nasa.gov • http://www.aec-able.com/corpinfo/Resources/ultraflex.pdf • http://www.spectrolab.com/

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