1. AAE450 Spring 2009 Power Group Tony Cofer Surviving the Lunar Night 03/25/09 [Tony Cofer] [Power] Page 1

2. AAE450 Spring 2009 Power Needed at Night  Hydrazine specific energy = 973 W∙hr/Kg  Li-ion batteries specific energy = 145 W∙hr/Kg  Thermal equilibrium maintained but temperature distribution to be determined [Tony Cofer] [Power] Page 2 payload total heat loss (W∙hr) mass batteries (kg) mass N 2 H 4 (kg) mass savings (kg) 100g336023.23.6519.5 10kg369625.54.1321.4

3. AAE450 Spring 2009 Hydrazine Heater for 100g and 10kg [Tony Cofer] [Power] SystemController Page 3

4. AAE450 Spring 2009 Nocturnal Power Controller  Save 11.5 kg of batteries  Controllable  Size 2”X2”X1/2”  Weight~20 g  Power diss. 0.1mW  Requires 0.23 g battery for 14 days [Tony Cofer] [Power] Controller Interface Solar Source Comparator With Hysteresis Actuator Page 4 Command Computer

5. AAE450 Spring 2009 [Tony Cofer] [Power] Page 5 Basic Circuit

6. AAE450 Spring 2009 Backup Slide  10 W 14 days =10W∙14 days∙24 hrs/day= 3360 W∙hr  Good catalyst reaction 200 kg/m 2 ∙s  2.8 mg/s would need 1.4 X10 -9 m 2  Hrxn = -112093 J/mol = 3502916 J/Kg=  973 W∙hr [Tony Cofer] [Power] Page 6

7. AAE450 Spring 2009 Backup Slide - Parts List  4081 Quad AND gate  4009 Hex Inverter  MC33102 sleep mode op amp  4066 quad line driver  4068 dual D-latch  Resistors 4 X 100k,2 X 2 meg  2 “X 2” circuit board [Tony Cofer] [Power] Page 7

8. AAE450 Spring 2009 Backup Slide - Actuators [Tony Cofer] [Power] Page 8 Common Relay Power Mosfet Pulse shut-off/turn-on