1 / 26

The Space Station Power System Solar Array Battery Power Management & Distribution

The Space Station Power System Solar Array Battery Power Management & Distribution. Dave McKissock NASA Glenn Research Center May 24, 2006 david.b.mckissock@nasa.gov. Compare ISS & Your Home Scratch off items not applicable to both locations. Bath tub Exercise Machine

Download Presentation

The Space Station Power System Solar Array Battery Power Management & Distribution

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. The Space Station Power SystemSolar ArrayBatteryPower Management & Distribution Dave McKissock NASA Glenn Research Center May 24, 2006 david.b.mckissock@nasa.gov

  2. Compare ISS & Your HomeScratch off items not applicable to both locations • Bath tub • Exercise Machine • Kitchen Table & Chairs • Weekly cleaning • Cable TV • Thermal Control • Hot Water Heater • Smoke Alarm • Electrical Power • Trash removal • Clean Gutters • Replenish O2 • Waste water removal • Swim Suit • Lawn Maintenance • Food Preparation

  3. ISS Batteries 38 cells wired in series make one Battery Orbital Replacement Unit (Battery ORU)

  4. ISS Batteries Battery Charge Discharge Unit (BCDU) One Battery = 2 Battery ORUs Battery ORU Battery ORU

  5. Space Station Power SystemOne Channel

  6. What’s Next in Space Power? • Crew Exploration Vehicle • Lunar Lander • Lunar Rover • Lunar Base (?) • Mars Base (?)

  7. Poll Question #1 Do you support the new plan for space exploration that returns the space shuttle to flight, completes assembly of the space station, builds a replacement for the shuttle, returns to the Moon and then on to Mars and beyond?

  8. July 2004 Gallup Survey Results • With funding for NASA’s program expected not to exceed 1% of the federal budget, 42% of adults surveyed say they support the proposed Exploration program

  9. Solar cells make electricity from sunlight Electricity

  10. Electricity is described in two ways: • Voltage (Volts, V) • Current (Amperes, A) V A { Power = Voltage * Current }

  11. A • Connect solar cells together… • Series (end to end): to build up voltage • Parallel (side by side): to build up current • This makes a solar array

  12. A - - - - - - - - - + + + + + + + + + end to end Series or side by side Parallel? end to end Series or side by side Parallel? V (currents add) (voltages add)

  13. Example: Airplane model propeller motor • Electric motor wants 12 volts and ½ amperes • Each solar cell can provide: • ½ volt and ¼ amperes • How do you connect the solar cells?

  14. Poll Question #2 • Need 12V at ½ Amp • Each cell generates ½ V at ¼ Amp • What do I need?

  15. Discussion of Poll AnswerD: Both A & C • 24 cells (end-to-end) • Add ½ volt plus ½ volt 24 times = 12V (or ½ x 24 = 12) • 2 cells (side by side) • Add ¼ amp plus ¼ amp = ½ amp • Individual cell performance varies as environment changes

  16. Two popular ways to store electrical energy… BatteryFuel Cell

  17. In battery cell, chemicals react at 2 electrodes and separate charges • stores charges, builds up voltage • if connected to a light bulb, charges flow (current)

  18. In a fuel cell stack, “stuff” is fed to metal plates, reacts and gives/takes charges • separate charges to build up voltage O H Remember H20 ?

  19. A - + - - - - - - - - - - - + + + + + + + + + + + Parallel Currents add Series  Voltages add V Energy Storage

  20. Batteries on Space Station • Desire 114 Volts • Willing to take whatever current you get • Each Nickel-Hydrogen cell (NiH2) produces 1.5V, rated at 81 Amp-Hours • What series / parallel arrangement do you recommend?

  21. Poll Question #3 • Need 114V at whatever Amps • Each cell generates 1½ V at 81 Amp-Hr • What will I need?

  22. Discussion of Poll Results • Correct Answer is “A”, 76 cells in series at 1.5 volts per cell yields 76 x 1.5 = 114 V • No spare cells for voltage redundancy • Batteries designed to last 6.5 years and provide needed voltage • Nuclear power not an option in low earth orbit

  23. NSTA SciGuides: Provide tools to quickly and easily locate targeted science content information and teaching resources from NSTA-reviewed science web sites. http://sciguides.nsta.org

More Related