title: CELSS transportation analysis.
abstract: Regenerative life support systems based on the use of biological material have been considered for inclusion in manned spacecraft since the early days of the United States space program.  These biological life support systems are currently being developed by NASA in the Controlled Ecological Life Support Systems (CELSS) program.  Because of the progress being achieved in the CELSS program, it is time to determine which space missions may profit from use of the developing technology.  This paper presents the results of a study that was conducted to estimate where potential transportation cost savings could be anticipated by using CELSS technology for selected future manned space missions.  Six representative missions were selected for study from those included in NASA planning studies.  The selected mission ranged from a low Earth orbit mission to those associated with asteroids and a Mars sortie.  The crew sizes considered varied from four persons to five thousand. Other study parameters included mission duration and life support closure percentages, with the latter ranging from complete resupply of consumable life support materials to 97% closure of the life support system.  The paper present the analytical study approach and describes the missions and systems considered, together with the benefits derived from CELSS when applicable.
authors.affiliation: Space Systems Division, Boeing Aerospace Company, Seattle, WA 98124, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Olson
authors.forename: E A
authors.initials: EA
authors.lastname: Gustan
authors.forename: T J
authors.initials: TJ
authors.lastname: Vinopal
mesh_terms: D003362:Cost-Benefit Analysis; D018504:Ecological Systems, Closed; D008021:Life Support Systems / Q000191:economics / Q000295:instrumentation*; D018535:Mars; D008962:Models, Theoretical; D016081:Moon; D016082:Solar System; D013026:Space Flight / Q000191:economics / Q000295:instrumentation*; D018531:Spacecraft / Q000295:instrumentation*; D014186:Transportation