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CO2 Emission from Solar Power satellite (SPS) Multi-Tether Satellite System

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-mail:asakura@rku.ac.jp Satoshi Nakano Keio Economic Observatory (KEO) , Keio University

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CO2 Emission from Solar Power satellite (SPS) Multi-Tether Satellite System

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  1. CO2Emissionfrom Solar Power satellite (SPS) Multi-Tether Satellite System Keiichiro Asakura Faculty of Economics , Ryutsu Keizai University 120 , Ryugasaki City, Ibaraki 301-8555, Japan E-mail:asakura@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.

  2. Satellite Geo-Stationary Orbit 36,000km Tether Photo-voltaic panel 2.5km ×2.5km Upper panel:2.8GW Lower panel:2.5GW Concept of SPS Orbital Transfer Vehicle（OTV） Payload;50ｔ Propellant；LAｒ,30t 1unit;145t Total：171unit,600 round trips Microwave Low Earth Orbit Reusable Launch Vehicle （RLV） Payload ：50ｔ Propellant；LH2,250t LO2,1,500t 1unit;2,000t Total:14unit,1000 round trips Electric power 1GW RectennaDiameter;3.5km Earth’s Surface

  3. Model and Data 1.Model - Environmental I-O Analysis CO2k= C (I-A)-1 fk・・・（1） C：CO2 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・・・) CO2k :CO2 emission of k-th SPS component 2.Data (a) Japanese Environmental I-O Table (b)SPS Material data

  4. MakingSPSFinalDemand 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) andSasaki(2006)

  5. Overview of the CO2 Emissionfrom 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

  6. 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

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