1. AAE450 Spring 2009 Power Systems for Lander Adham Fakhry [Adham Fakhry] [Power]

2. AAE450 Spring 2009 Final Power Systems [Adham Fakhry] [POW] 2 100 gram LanderMass (kg)Dimensions (m)Cost ($) Solar Cells2.00.785 m 2 250,000 Batteries0.4220.1016 X 0.0252 X 0.07091500 DC-DC Converters0.7250.06 X 0.05 X 0.0451,000 PCDU (Power Conditions and Distribution unit) 1.90.033 X 0.033 X 0.03312,000 10 kg LanderMass (kg)Dimensions (m)Cost ($) Solar Cells2.00.785 m 2 250,000 Batteries0.6450.142 X 0.0534 X 0.15022000 DC-DC Converters0.8150.06 X 0.05 X 0.0457,500 PCDU (Power Conditions and Distribution unit) 1.90.033 X 0.033 X 0.03312,000

3. AAE450 Spring 2009 Final Power Systems for Arbitrary [Adham Fakhry] [POW] 3 Arbitrary LanderMass (kg)Dimensions (m)Cost ($) Solar Cells2.00.785 m 2 250,000 Batteries0.890.142 X 0.0276 X 0.0952000 DC-DC Converters0.9850.07 X 0.06 X 0.0468,000 PCDU (Power Conditions and Distribution unit) 1.90.033 X 0.033 X 0.03312,000

4. AAE450 Spring 2009 Backup Slide 1: Power Available to the Lander [Adham Fakhry] [POW] 4

5. AAE450 Spring 2009 Battery Design (1)  Battery is designed for meet three power goals for 100 g Lander: –Delivers 124 W for 250 seconds for operating the Lander engine –Delivers 30 W for 576 seconds of attitude –Delivers 60.4 W for 30 minutes for all communication gear [Adham Fakhry] [POW] 5

6. AAE450 Spring 2009 Battery Design (2)  Battery is designed for meet three power goals for 10 kg Lander: –Delivers 150 W for 450 seconds for operating the Lander engine –Delivers 30 W for 900 seconds of attitude –Delivers 56.4 W for 30 minutes for all communication gear [Adham Fakhry] [POW] 6

7. AAE450 Spring 2009 Battery Design (3)  Battery is designed for meet three power goals for Large Lander: –Delivers 275 W for 500 seconds for operating the Lander engine –Delivers 30 W for 900 seconds of attitude –Delivers 56.4 W for 30 minutes for all communication gear [Adham Fakhry] [POW] 7

8. AAE450 Spring 2009 Solar Array sizing  Solar array Calculations:  Dimensions of Solar cells: –Area of Lander roof = π(1/2) 2 = 0.785 m 2 –Solar efficiency = 300 W/m 2 –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 –Total cost = $235,600 + 4,400 (for additional costs) = $250,000 [Adham Fakhry] [POW] 8

9. AAE450 Spring 2009 Hydrazine Tanks  100 g –3.9 kg Hydrazine + 0.3 kg Tank = 4.2 kg –0.2 m diameter tanks, V= 0.00133 m 3  10 kg –4.13 kg Hydrazine + 0.31 kg Tank = 4.41 kg –0.21 m diameter tanks, V= 0.0015 m 3  Large Payload –42.6 kg Hydrazine + 2.25 kg Tank = 44.85 kg –0.43 m diameter tanks, V= 0.0133 m 3 [Adham Fakhry] [POW] 9

10. AAE450 Spring 2009 Battery Specifications  3.6 V, 20 Ah Lithium Ion Cell  Gives 72 W-hr only need 44 W-hr  Energy Density = 140 W-hr/kg  Dimensions = 0.142 m X 0.0534 m X 0.1502 m  Cost $2000 per cell  From Yardney - Lithion [Adham Fakhry] [Power] 10

11. AAE450 Spring 2009 Heats of Reaction Calculations  10 W 14 days =10W∙14 days∙24 hrs/day.60 min/s.6 secs= 12096000 Joules  H rxn = -112093 J/mol = 3502916 J/Kg  Mass of Hydrazine = 3.45 kg [Adham Fakhry] [Power] 11