1. Critical Design Review
Transit Power
Critical Design Review
Patrick Kennedy
3 / 6 / 01

2. Update
Regenerative Fuel Cells
Solar Arrays
Batteries

3. Regenerative Fuel Cells
20 kW
Down from 30 kW
Power during Launch
Power during Landing
Back-up power in transit

4. Regenerative Fuel Cells (cont.)
5 days of operation
Mass: 3300 kg
Down from 4600 kg
Volume: 6.6 m3
Down from 7.8 m3

7. Solar Panels 47.5 kW of power Mass: 2000 kg Area: 323 m2
Recharge power
Cryogenic equipment
Mass: 2000 kg
Area: 323 m2
Reliability: 99%

10. Solar Panels (cont.) Folded Volume: 12 m3 2 6m x 1m x 1m sections
Image from:

11. Image from: http://spaceflight.nasa.gov/shuttle/archives/sts-97/index.html

12. Batteries CTV Power: 7 kW Mass: 1800 kg Volume: 1.74 m^3
Power during landing
Power during launch
Power: 7 kW
Mass: 1800 kg
Assume: 9 hour discharge time (X-38)
Volume: 1.74 m^3