NASA Technical Memorandum 101603 

ALTERNATE SPACE STATION FREEDOM 

CONFIGURATION CONS1 DERATIONS TO 

ACCOMMODATE SOLAR DYNAMIC POWER 

L. J. DeRyder 

J. N. Cruz 

M. L. Heck 

B. P. Robertson 

P. A. Troutman 

ruEn May 28, 1989 

National Aeronautics and 

Space Administration 

Langley Research Center 

Hampton,Virginia 23665-5225 
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1. Report No. 2. Govcnnmenr Access~on No. 

NASA TM-101603 

4. Title and Subotte 5. Repon Oate 

3. Reapem's Catalog No. 

Alternate Space Station Freedom Configuration Considerations to Accommodate Solar Dynamic Power 

7. Author($) 8. Pdomnng Organization Repon No. 

L. J. DeRyder, J. N. Cruz, M. L. Heck, B. P. Robertson, I 

9. Performing Organization Name and Address 

NASA Langley Research Center 

and P. A. Troutman 

476-50-02-02 

11. Contract or Grant No. 

10. worfi unit No. 

- 

Hampton, Virginia 23665-5225 

12. Sponsoring Agency Name and Address 

National Aeronautics and Space Administration 

Washington, D. C. 20546-0001 

13. Type of Report and Period Covered 

Technical Memorandum 

14. Sponsoring Agency Code 

17. Key Worda (Suggested bv Author($)) 

16. AM 

18. Dirttibution Statement 

The results of a technical audit of the Space Station Freedom Program conducted by the Program Director 

Mas announced in early 1989 and included a proposal to use solar dynamic power generation systems to 

xovide primary electrical energy for orbital flight operations rather than photovoltaic solar array systems. To 

jenerate the current program baseline power of 75 kw, two or more solar concentrators approximately 50 feet in 

jiameter would be required to replace four pairs of solar arrays whose rectangular blanket size is approximately 

200 feet by 30 feet. The photovoltaic power system concept uses solar arrays to generate electricity that is stored 

n nickel-hydrogen batteries. The proposed concept uses the solar concentrator dishes to reflect and focus the 

Sun's energy to heat helium-xenon gas to drive electricity generating turbines. Circulation of the gas through 

sutectic LiF-CaF2 salt beds stores thermal energy to operate the turbines when the station's orbital trajectory is 

scculted from the sunlight. In addition to an overall increase in solar to electric energy conversion efficiency, the 

2rimary advantage of the solar dynamic power system concept over the photovoltaic power system concept is the 

reduced life cycle cost of blanket cell maintenance and battery replacement. A second key advantage is reduced 

aerodynamic drag area which is a major flight dynamic control system driver. 

Unclassified Unclassified 34 A0 3 

Space Station Freedom 

Solar Dynamic Power 

System Studies 

Unclassified - Unlimited