CO2 Emission from Solar Power satellite (SPS)

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CO2 Emission from Solar Power satellite
(SPS) Multi-Tether Satellite System
Keiichiro Asakura Faculty of Economics , Ryutsu
Keizai University 120 , Ryugasaki City, Ibaraki
301-8555, Japan E-mailasakura_at_rku.ac.jp Satoshi
Nakano Keio Economic Observatory (KEO) , Keio
University 2-15-45 Mita, Minatoku, Tokyo
108-8345, Japan Kanji Yoshioka Keio Economic
Observatory (KEO) , Keio University 2-15-45 Mita,
Minatoku, Tokyo 108-8345, Japan

Multi-Tether Satellite system is developed by
Professor Susumu SASAKI, Japan Aerospace
Exploration Agency JAXA .We would like to thank
him for giving us technical information and
helpful comments. We are solely responsible for
any errors.
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Concept of SPS
Satellite
Geo-Stationary Orbit 36,000km
Tether
Photo-voltaic panel 2.5km 2.5km Upper
panel2.8GW Lower panel2.5GW
Orbital Transfer Vehicle(OTV) Payload50t Propella
ntLAr,30t 1unit145t Total171unit,600 round
trips
Microwave
Low Earth Orbit
Reusable Launch Vehicle (RLV) Payload
50t PropellantLH2,250t LO2,1,500t 1unit2,000t T
otal14unit,1000 round trips
Electric power 1GW
RectennaDiameter3.5km
Earths Surface
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Model and Data

• 1.Model - Environmental I-O Analysis
• CO2 k C (I-A)-1 fk (1)
• CCO2 emission coefficient (diagonal)
• (I-A)-1 Leontief Inverse Matrix
• f k final demand vector of k-th SPS
  components
• (e.g. Satellite,Orbital Transfer Vehicle,
  Rectenna)
• CO2 k CO2 emission of k-th SPS component
• 2.Data
• (a) Japanese Environmental I-O Table
• (b)SPS Material data

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Making SPS Final Demand
Main data source of FD vectors estimated
are DOE/NASA(1980),Society of Chemical
Engineers(1995) Yearbook Machinery
Statistics, Unit price information in IO
Databases Naruo(1996) and Sasaki(2006)
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Overview of the CO2 Emission from SPS
CO2 Emission by main components
OTV Orbital Transfer Vehicle RLV Reusable
Launch Vehicle PV photovoltaics cell LAr Liquid
argon LH2 Liquid hydrogen LO2 Liquid oxygen
CO2 Emission by sector
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Comparison of CO2 emission of different
electricity generation systems
g-CO2/kWh
Figures on Coal,Oil,LNG,Nuclear and PV1 are
estimated by Hondo(2000) . Figure on PV2 is
recalculation on Nakano(2006),using eq.(1).
Figures on several types of SPS are estimated by
our group. Life time assumption on Multi-Tether
Satellite system 40 years. Total repair ratio
of Multi-Tether Satellite system is assumed to be
2.5,CO2 emission /kWh becomes 33g, if it is
permitted to assume it simply. CO2 emission in
distributing the electricity generated is not
included in the SPS figures (since the data is
not available) but is included for the other
systems.
?several types of SPS