Seminar 12! The Future of Space Flight! Spacecraft Power & Thermal Control!

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1 Seminar 12! The Future of Space Flight! Spacecraft Power & Thermal Control! Robert Stengel! FRS 112, From the Earth to the Moon! Princeton University, 2015! " NASA s Strategic Direction! Rationales and Approaches for Human Space Flight!! Spacecraft Power & Thermal Control! Understanding Space, Sec 13.2, 13.3! Copyright 2015 by Robert Stengel. All rights reserved. For educational use only.! 1! 2!

2 4! 3!

3 5! 6!

4 7! 8!

5 Spacecraft Power! 9! Typical Electrical Power Requirements" Generate electrical power for s/c systems" Store power for fill-in when shadowed from Sun" Distribute power to loads" Condition power (e.g., voltage regulation)" Protect power bus from faults" Provide clean, reliable, uninterrupted power" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 10!

6 Solar Cells" 11! Solar Cells" Silver, palladium, titanium, silicon sandwich " Photons hit panel" Electrons are excited, generating heat or traveling through material, e.g., boron or phosphorus, generating a current " 12!

7 13! Solar Cell Types and Characteristics" Silicon (Efficiency < 15%)" Gallium Arsenide (GaAs)" " Dual Junction (~22%)" " Triple Junction (~28%)" " Quad Junction (>30%)" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 14!

8 15! 16!

9 Functional Blocks of Electrical Power System" Energy generation" Energy storage" Power management and distribution" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 17! Solar Arrays" Generate power during sunlit periods for" " Payload" " Operation of power bus" " Charging batteries "" Typical power output: 2kW 15kW" Flexible solar-cell array deployment for CubeSat" 18!

10 Solar Array Design" Each solar cell produces" " < 2 W" " V" Series arrangement to produce voltage" Parallel arrangement to produce current" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 19! Batteries" Nickel Cadmium (NiCd)" " Heavier, older tech" " Lower volume" Nickel Hydrogen (NiH2)" " Present tech" " Pressurized vessels" Lithium Ion (Li Ion)" " State of the art" " # the mass, 1/3 the volume of NiH2" " Extra care required" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 20!

11 Definitions" Capacity: fully charged amount of energy" State of Charge (SOC): How much charge remains in battery" Depth of Discharge: How much charge is taken out of battery" Charge Rate: Rate (current) at which charge (Ah) is put into battery" Charge Efficiency: How much charge energy is stored" Charge/Discharge Ratio: Charge required to restore beginning SOC following discharge" Self Discharge: Low-level leakage" Trickle Charge: Continuing charge to counter self-discharge" Balancing: Equalizing the SOC of each cell in a battery" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 21! Power Management and Distribution" Solar array control" Battery charge control" Battery discharge control" Power distribution and protection" Bus voltage regulation and conditioning" Power switching" Power telemetry" Requirements driven by power system architecture, bus voltage, and power levels" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 22!

12 Power Management and Distribution" 23! Power System Architectures" Unregulated (battery-dominated) bus" " Bus voltage determined by battery voltage" Sunlight regulated bus" " Bus voltage regulated during sunlit period" " Bus voltage determined by battery voltage during eclipse" Fully regulated bus" " Bus voltage regulated in sunlight and eclipse" " Power converter boosts variable battery voltage to bus voltage" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 24!

13 Power System Sizing" Power system must " " Support the spacecraft through entire mission" " Recharge batteries after longest eclipse" " Accommodate electric propulsion loads" " Accommodate failures to assure reliability" " Account for margins and contingencies" Factors affecting sizing include" " Satellite orbit" " Time of year/seasonal variation" " Life degradation/environmental effects" " Total eclipse load" " Number of discharges" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 25! Power System Analysis" Power budget " " Payload, bus, and charge loads" " Error margins" Energy balance" " Dynamic simulation over multiple duty cycles" Stability Analysis" " Small-signal AC stability" " Bus impedance" " Bus ripple" " Transient response" MAE 342 Lecture, Bob Danielak, Lockheed-Martin, 2008" 26!

14 Power System Tradeoffs" 27! Proton Exchange Membrane Fuel Cell" Gemini Fuel Cell" 28!

15 Radioactive Isotope Thermoelectric Generator (Cassini Spacecraft)" 29! Radioactive Isotope Thermoelectric Generator" 30!

16 Stirling Cycle Radioactive Isotope Thermoelectric Generator" 31! Thermal Control! 32!

17 Typical Temperature Requirements" Maximum & minimum operational/nonoperational temperatures" Maximum diurnal swing" Maximum gradients" Survival/safe state temperature" Allowable rate of change" Control requirements of sub-systems" MAE 342 Lecture, Hamilton Wong, Lockheed-Martin, 2008" 33! J. C. Keesee! 34!

18 Thermal Design Environments" Pre-launch (shipping, on pad)" Launch and transfer orbit" Mission characteristics" " On orbit" " On surface" Sun exposure" Shadow" MAE 342 Lecture, Hamilton Wong, Lockheed-Martin, 2008" 35! Thermal Design Task" MAE 342 Lecture, Hamilton Wong, Lockheed-Martin, 2008" 36!

19 Heat Sources" MAE 342 Lecture, Hamilton Wong, Lockheed-Martin, 2008" 37! Fairing Inner Surface Maximum Temperatures" MAE 342 Lecture, Hamilton Wong, Lockheed-Martin, 2008" 38!

20 Thermal Design Constraints" Equipment utilization philosophy" Design margin philosophy" Failure mode philosophy" Power system margin" Mass budget" Temperature specifications" Sun/shadow duty cycle" Equipment redundancy" MAE 342 Lecture, Hamilton Wong, Lockheed-Martin, 2008" 39! Thermal Analysis" Steady state (thermal equilibrium)" Transient" Thermal network models" " Nodes" Elements that can be characterized by a single temperature" Energy storage devices" " Conductors" Energy transport" " Energy sinks" Closed-form idealizations" Finite element/difference software" MAE 342 Lecture, Hamilton Wong, Lockheed-Martin, 2008" 40!

21 Thermal Control Types" Passive" " Coatings and paints" " Thermal isolation" " Heat sinks" " Phase Change Materials" Active" " Heaters" " Heat pipes" " Thermoelectric devices" " Thermal louvers" MAE 342 Lecture, Hamilton Wong, Lockheed-Martin, 2008" 41! Reflectors, Insulation, and Thermal Louvers" Mars Reconnaissance Orbiter" Multi-Layer Insulation" Messenger Thermal Louvers" 42!

22 Heat Pumps" Capillary Pumped Loop" Looped Heat Pipe" Prager et al, 2002! 43! New Horizons RTG and Thermal Control" 44!

23 Chang e-3 and Yutu" 45!

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