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Performance and Mass Modeling Subtleties in Closed-Brayton-Cycle Space Power SystemsA number of potential NASA missions could benefit from closed-Brayton-cycle (CBC) power conversion systems. The human and robotic mission power applications include spacecraft, surface base, and rover scenarios. Modeling of CBC subsystems allows system engineers, mission planners and project managers to make informed decisions regarding power conversion system characteristics and capabilities. To promote thorough modeling efforts, a critical review of CBC modeling techniques is presented. Analysis of critical modeling elements, component influences and cycle sensitivities is conducted. The analysis leads to quantitative results addressing projections on converter efficiency and overall power conversion system mass. Even moderate modeling errors are shown to easily over-predict converter efficiencies by 30% and underestimate mass estimates by 20%. Both static and dynamic modeling regimes are evaluated. Key considerations in determining model fidelity requirements are discussed. Conclusions and recommendations are presented that directly address ongoing modeling efforts in solar and nuclear space power systems.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Barrett, Michael J.
(NASA Glenn Research Center Cleveland, OH, United States)
Johnson, Paul K.
(Analex Corp. Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Spacecraft Design, Testing And Performance
Funding Number(s)
WBS: WBS 22-973-80-10
Distribution Limits
Public Use Permitted.
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