Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

Appendix L: Tether Boost Facility Design Final Reportmass gyros). The charts below shows items tracked and approximately how theyrelate.TECHNOLOGYPARAMETERFLYWHEELNiH 2NiCdNiMHLi IONTurbineMATURITY (YEAR)2002 1980 1970 1995 2001TBDFLIGHT HISTORYNONE LOTS LOTS NONE Near termNONEMASS (Kg/kW)5-1053.2374 53.2 7-9TBDVOLUME (M 3 /kW)0.028 M 30.14 M 3 0.04M 3 0..04 M 3TBDDEPTH OF DISCHARGE60%30%0.08 M 3 10 YEARS ? TBD >10 years8% 20% 30%TBDCOST (00 $’s) / 40 AHTBD$300,000$300,000 N/A $350,000TBDSYSTEM ENG. DENSITY72 WH/Kg14 WH/Kg2 WH/Kg 14 WH/Kg 45 WH/KgTBDROBUSTNESS>10 YEARS>10 YEARSTBDSCALE ECONOMIESHIGH MED. MED. HIGH HIGHTBDNiH 2- Nickel HydrogenNiCd - Nickel CadmiumNiMH - Nickel Metal HydrideLi ION - Lithium IonGood potentialFigure 3-5. Energy Storage OptionsStarting point3.4.4 Recommended Follow-on studiesItems like the energy storage trade study and thermal transfer should beperiodically (every one-two years) revisited to determine if a technology breakthroughhas allowed one technology to displace the other as the system of choice.Also methods of converting the considerable waste heat generated by the highpower electrical to useful energy should be explored. A quick look was performed todetermine if a Sterling Cycle Engine or similar device could be used to convert wasteheat back to useful energy. Preliminary results indicate the delta-T is borderline forefficient energy conversion. This is further covered in the thermal control section.3.5 Thermal Control3.5.1 Design Requirements, Drivers, and AssumptionsMany of the subsystems of the control station will only require passive thermalcontrol using the normal techniques of material selection, coatings, and thermalL-62