Space Station Freedom Growth Power Requirements B. D. MEREDITH, P. R. AHLF & R. J. SAUCILLO Summary Options and scenarios for the evolution of Space Station Freedom beyond the current baseline have been established and analyzed at NASA Langley Research Center to identify growth requirements for the program’s Preliminary Requirements Review (PRR). Time-phase requirements for electrical power and other critical resources were determined based upon the future needs of the science, technology and commercial users. In addition, impacts and resource growth were determined for the utilization of station as a transportation node in support of human exploration initiatives to the moon and/or Mars. The set of requirements chosen for the PRR were selected on the basis of their adequacy in accommodating each of the evolution options and scenarios within each option, thereby maximizing future flexibility. In the case of electrical power, growth to 275 kW (average) was determined to be adequate for evolutionary missions and station housekeeping growth, given projections of future Earth-to-orbit transportation capabilities. Introduction The Space Station Freedom (SSF) Program conducted its Preliminary Requirements Review (PRR) (February-June 1988) to initiate the design and development phase of the program. The objective was to adopt a consistent set of system requirements, thereby allowing the work package centers and contractors to proceed with the preliminary design of the various elements and systems. The Space Station Freedom office at Langley Research Center (LaRC) has the technical lead for an agency-wide program which develops configuration concepts and design requirements for the evolution of Space Station Freedom beyond the baseline or phase I. In that capacity, key resource and design requirements for station growth were identified and advocated to the program at PRR. Mission and systems analyses were performed to identify growth requirements for electrical power and other critical space station resources (e.g. crew, pressurized volume) consistent with user needs. This paper presents the results of these analyses and identifies requirements and recommendations for electrical power growth on space station based upon two principal evolution options, specific utilization emphases within each option and estimates of Earth-to-orbit (ETO) transportation capability. B. D. Meredith, NASA Langley Research Center, Hampton, VA 23665, USA. P. R. Ahlf & R. J. Saucillo, McDonnell Douglas Space Systems Company, Washington Operations Division, Rockville, MD 20850, USA.
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